Abstract
Human immunodeficiency virus type 1 (HIV-1) encodes a transactivator of transcription (Tat) protein, which has several functions that promote viral replication, pathogenesis, and disease. Amino acid variation within Tat has been observed to alter the functional properties of Tat and, depending on the HIV-1 subtype, may produce Tat phenotypes differing from viruses’ representative of each subtype and commonly used in in vivo and in vitro experimentation. The molecular properties of Tat allow for distinctive functional activities to be determined such as the subcellular localization and other intracellular and extracellular functional aspects of this important viral protein influenced by variation within the Tat sequence. Once Tat has been transported into the nucleus and becomes engaged in transactivation of the long terminal repeat (LTR), various Tat variants may differ in their capacity to activate viral transcription. Post-translational modification patterns based on these amino acid variations may alter interactions between Tat and host factors, which may positively or negatively affect this process. In addition, the ability of HIV-1 to utilize or not utilize the transactivation response (TAR) element within the LTR, based on genetic variation and cellular phenotype, adds a layer of complexity to the processes that govern Tat-mediated proviral DNA-driven transcription and replication. In contrast, cytoplasmic or extracellular localization of Tat may cause pathogenic effects in the form of altered cell activation, apoptosis, or neurotoxicity. Tat variants have been shown to differentially induce these processes, which may have implications for long-term HIV-1-infected patient care in the antiretroviral therapy era. Future studies concerning genetic variation of Tat with respect to function should focus on variants derived from HIV-1-infected individuals to efficiently guide Tat-targeted therapies and elucidate mechanisms of pathogenesis within the global patient population.
Similar content being viewed by others
References
Rana TM, Jeang KT (1999) Biochemical and functional interactions between HIV-1 Tat protein and TAR RNA. Arch Biochem Biophys 365(2):175–185. https://doi.org/10.1006/abbi.1999.1206
Li L, Dahiya S, Kortagere S, Aiamkitsumrit B, Cunningham D, Pirrone V, Nonnemacher MR, Wigdahl B (2012) Impact of Tat genetic variation on HIV-1 disease. Adv Virol 2012:123605. https://doi.org/10.1155/2012/123605
Gu J, Babayeva ND, Suwa Y, Baranovskiy AG, Price DH, Tahirov TH (2014) Crystal structure of HIV-1 Tat complexed with human P-TEFb and AFF4. Cell Cycle 13(11):1788–1797. https://doi.org/10.4161/cc.28756
Price DH (2000) P-TEFb, a cyclin-dependent kinase controlling elongation by RNA polymerase II. Mol Cell Biol 20(8):2629–2634
Jeang KT, Xiao H, Rich EA (1999) Multifaceted activities of the HIV-1 transactivator of transcription, Tat. J Biol Chem 274(41):28837–28840
Ratner L, Haseltine W, Patarca R, Livak KJ, Starcich B, Josephs SF, Doran ER, Rafalski JA, Whitehorn EA, Baumeister K et al (1985) Complete nucleotide sequence of the AIDS virus, HTLV-III. Nature 313(6000):277–284
Rayne F, Debaisieux S, Yezid H, Lin YL, Mettling C, Konate K, Chazal N, Arold ST, Pugniere M, Sanchez F, Bonhoure A, Briant L, Loret E, Roy C, Beaumelle B (2010) Phosphatidylinositol-(4,5)-bisphosphate enables efficient secretion of HIV-1 Tat by infected T-cells. EMBO J 29(8):1348–1362. https://doi.org/10.1038/emboj.2010.32
Koken SE, Greijer AE, Verhoef K, van Wamel J, Bukrinskaya AG, Berkhout B (1994) Intracellular analysis of in vitro modified HIV Tat protein. J Biol Chem 269(11):8366–8375
Pierleoni R, Menotta M, Antonelli A, Sfara C, Serafini G, Dominici S, Laguardia ME, Salis A, Damonte G, Banci L, Porcu M, Monini P, Ensoli B, Magnani M (2010) Effect of the redox state on HIV-1 tat protein multimerization and cell internalization and trafficking. Mol Cell Biochem 345(1–2):105–118. https://doi.org/10.1007/s11010-010-0564-9
Ranga U, Shankarappa R, Siddappa NB, Ramakrishna L, Nagendran R, Mahalingam M, Mahadevan A, Jayasuryan N, Satishchandra P, Shankar SK, Prasad VR (2004) Tat protein of human immunodeficiency virus type 1 subtype C strains is a defective chemokine. J Virol 78(5):2586–2590
Wei P, Garber ME, Fang SM, Fischer WH, Jones KA (1998) A novel CDK9-associated C-type cyclin interacts directly with HIV-1 Tat and mediates its high-affinity, loop-specific binding to TAR RNA. Cell 92(4):451–462
Marzio G, Tyagi M, Gutierrez MI, Giacca M (1998) HIV-1 tat transactivator recruits p300 and CREB-binding protein histone acetyltransferases to the viral promoter. Proc Natl Acad Sci USA 95(23):13519–13524
Jeang KT, Chun R, Lin NH, Gatignol A, Glabe CG, Fan H (1993) In vitro and in vivo binding of human immunodeficiency virus type 1 Tat protein and Sp1 transcription factor. J Virol 67(10):6224–6233
Hauber J, Malim MH, Cullen BR (1989) Mutational analysis of the conserved basic domain of human immunodeficiency virus tat protein. J Virol 63(3):1181–1187
Mukerjee R, Sawaya BE, Khalili K, Amini S (2007) Association of p65 and C/EBPbeta with HIV-1 LTR modulates transcription of the viral promoter. J Cell Biochem 100(5):1210–1216. https://doi.org/10.1002/jcb.21109
Ruben S, Perkins A, Purcell R, Joung K, Sia R, Burghoff R, Haseltine WA, Rosen CA (1989) Structural and functional characterization of human immunodeficiency virus tat protein. J Virol 63(1):1–8
van der Kuyl AC, Vink M, Zorgdrager F, Bakker M, Wymant C, Hall M, Gall A, Blanquart F, Berkhout B, Fraser C, Cornelissen M, Collaboration B (2018) The evolution of subtype B HIV-1 tat in the Netherlands during 1985–2012. Virus Res 250:51–64. https://doi.org/10.1016/j.virusres.2018.04.008
Neuveut C, Scoggins RM, Camerini D, Markham RB, Jeang KT (2003) Requirement for the second coding exon of Tat in the optimal replication of macrophage-tropic HIV-1. J Biomed Sci 10(6 Pt 1):651–660. https://doi.org/10.1159/000073531
Kukkonen S, Martinez-Viedma Mdel P, Kim N, Manrique M, Aldovini A (2014) HIV-1 Tat second exon limits the extent of Tat-mediated modulation of interferon-stimulated genes in antigen presenting cells. Retrovirology 11:30. https://doi.org/10.1186/1742-4690-11-30
Lopez-Huertas MR, Mateos E, Sanchez Del Cojo M, Gomez-Esquer F, Diaz-Gil G, Rodriguez-Mora S, Lopez JA, Calvo E, Lopez-Campos G, Alcami J, Coiras M (2013) The presence of HIV-1 Tat protein second exon delays fas protein-mediated apoptosis in CD4 + T lymphocytes: a potential mechanism for persistent viral production. J Biol Chem 288(11):7626–7644. https://doi.org/10.1074/jbc.M112.408294
Aiamkitsumrit B, Dampier W, Martin-Garcia J, Nonnemacher MR, Pirrone V, Ivanova T, Zhong W, Kilareski E, Aldigun H, Frantz B, Rimbey M, Wojno A, Passic S, Williams JW, Shah S, Blakey B, Parikh N, Jacobson JM, Moldover B, Wigdahl B (2014) Defining differential genetic signatures in CXCR4- and the CCR5-utilizing HIV-1 co-linear sequences. PLoS One 9(9):e107389. https://doi.org/10.1371/journal.pone.0107389
Chiodelli P, Urbinati C, Mitola S, Tanghetti E, Rusnati M (2012) Sialic acid associated with alphavbeta3 integrin mediates HIV-1 Tat protein interaction and endothelial cell proangiogenic activation. J Biol Chem 287(24):20456–20466. https://doi.org/10.1074/jbc.M111.337139
Urbinati C, Mitola S, Tanghetti E, Kumar C, Waltenberger J, Ribatti D, Presta M, Rusnati M (2005) Integrin alphavbeta3 as a target for blocking HIV-1 Tat-induced endothelial cell activation in vitro and angiogenesis in vivo. Arterioscler Thromb Vasc Biol 25(11):2315–2320. https://doi.org/10.1161/01.ATV.0000186182.14908.7b
Lopez-Huertas MR, Callejas S, Abia D, Mateos E, Dopazo A, Alcami J, Coiras M (2010) Modifications in host cell cytoskeleton structure and function mediated by intracellular HIV-1 Tat protein are greatly dependent on the second coding exon. Nucleic Acids Res 38(10):3287–3307. https://doi.org/10.1093/nar/gkq037
Canducci F, Marinozzi MC, Sampaolo M, Berre S, Bagnarelli P, Degano M, Gallotta G, Mazzi B, Lemey P, Burioni R, Clementi M (2009) Dynamic features of the selective pressure on the human immunodeficiency virus type 1 (HIV-1) gp120 CD4-binding site in a group of long term non progressor (LTNP) subjects. Retrovirology 6:4. https://doi.org/10.1186/1742-4690-6-4
Rhee SY, Fessel WJ, Zolopa AR, Hurley L, Liu T, Taylor J, Nguyen DP, Slome S, Klein D, Horberg M, Flamm J, Follansbee S, Schapiro JM, Shafer RW (2005) HIV-1 Protease and reverse-transcriptase mutations: correlations with antiretroviral therapy in subtype B isolates and implications for drug-resistance surveillance. J Infect Dis 192(3):456–465. https://doi.org/10.1086/431601
Dampier W, Nonnemacher MR, Mell J, Earl J, Ehrlich GD, Pirrone V, Aiamkitsumrit B, Zhong W, Kercher K, Passic S, Williams JW, Jacobson JM, Wigdahl B (2016) HIV-1 genetic variation resulting in the development of new quasispecies continues to be encountered in the peripheral blood of well-suppressed patients. PLoS One 11(5):e0155382. https://doi.org/10.1371/journal.pone.0155382
Roy CN, Khandaker I, Oshitani H (2015) Intersubtype genetic variation of HIV-1 Tat Exon 1. AIDS Res Hum Retroviruses 31(6):641–648. https://doi.org/10.1089/AID.2014.0346
Roy CN, Khandaker I, Oshitani H (2015) Evolutionary dynamics of Tat in HIV-1 subtypes B and C. PLoS One 10(6):e0129896. https://doi.org/10.1371/journal.pone.0129896
Li L, Aiamkitsumrit B, Pirrone V, Nonnemacher MR, Wojno A, Passic S, Flaig K, Kilareski E, Blakey B, Ku J, Parikh N, Shah R, Martin-Garcia J, Moldover B, Servance L, Downie D, Lewis S, Jacobson JM, Kolson D, Wigdahl B (2011) Development of co-selected single nucleotide polymorphisms in the viral promoter precedes the onset of human immunodeficiency virus type 1-associated neurocognitive impairment. J Neurovirol 17(1):92–109. https://doi.org/10.1007/s13365-010-0014-1
Liu Y, Li J, Kim BO, Pace BS, He JJ (2002) HIV-1 Tat protein-mediated transactivation of the HIV-1 long terminal repeat promoter is potentiated by a novel nuclear Tat-interacting protein of 110 kDa, Tip110. J Biol Chem 277(26):23854–23863. https://doi.org/10.1074/jbc.M200773200
Rossenkhan R, MacLeod IJ, Sebunya TK, Castro-Nallar E, McLane MF, Musonda R, Gashe BA, Novitsky V, Essex M (2013) tat Exon 1 exhibits functional diversity during HIV-1 subtype C primary infection. J Virol 87(10):5732–5745. https://doi.org/10.1128/JVI.03297-12
Campbell GR, Loret EP, Spector SA (2010) HIV-1 clade B Tat, but not clade C Tat, increases X4 HIV-1 entry into resting but not activated CD4 + T cells. J Biol Chem 285(3):1681–1691. https://doi.org/10.1074/jbc.M109.049957
Mishra M, Vetrivel S, Siddappa NB, Ranga U, Seth P (2008) Clade-specific differences in neurotoxicity of human immunodeficiency virus-1 B and C Tat of human neurons: significance of dicysteine C30C31 motif. Ann Neurol 63(3):366–376. https://doi.org/10.1002/ana.21292
Tyor W, Fritz-French C, Nath A (2013) Effect of HIV clade differences on the onset and severity of HIV-associated neurocognitive disorders. J Neurovirol 19(6):515–522. https://doi.org/10.1007/s13365-013-0206-6
Shah S, Alexaki A, Pirrone V, Dahiya S, Nonnemacher MR, Wigdahl B (2014) Functional properties of the HIV-1 long terminal repeat containing single-nucleotide polymorphisms in Sp site III and CCAAT/enhancer binding protein site I. Virol J 11:92. https://doi.org/10.1186/1743-422X-11-92
Kilareski EM, Shah S, Nonnemacher MR, Wigdahl B (2009) Regulation of HIV-1 transcription in cells of the monocyte-macrophage lineage. Retrovirology 6:118. https://doi.org/10.1186/1742-4690-6-118
Burdo TH, Nonnemacher M, Irish BP, Choi CH, Krebs FC, Gartner S, Wigdahl B (2004) High-affinity interaction between HIV-1 Vpr and specific sequences that span the C/EBP and adjacent NF-kappaB sites within the HIV-1 LTR correlate with HIV-1-associated dementia. DNA Cell Biol 23(4):261–269. https://doi.org/10.1089/104454904773819842
Maubert ME, Pirrone V, Rivera NT, Wigdahl B, Nonnemacher MR (2015) Interaction between Tat and drugs of abuse during HIV-1 infection and central nervous system disease. Front Microbiol 6:1512. https://doi.org/10.3389/fmicb.2015.01512
Clifford DB (2017) HIV-associated neurocognitive disorder. Curr Opin Infect Dis 30(1):117–122. https://doi.org/10.1097/QCO.0000000000000328
Kaul M, Garden GA, Lipton SA (2001) Pathways to neuronal injury and apoptosis in HIV-associated dementia. Nature 410(6831):988–994. https://doi.org/10.1038/35073667
Dahiya S, Irish BP, Nonnemacher MR, Wigdahl B (2013) Genetic variation and HIV-associated neurologic disease. Adv Virus Res 87:183–240. https://doi.org/10.1016/B978-0-12-407698-3.00006-5
Andras IE, Pu H, Deli MA, Nath A, Hennig B, Toborek M (2003) HIV-1 Tat protein alters tight junction protein expression and distribution in cultured brain endothelial cells. J Neurosci Res 74(2):255–265. https://doi.org/10.1002/jnr.10762
Albini A, Ferrini S, Benelli R, Sforzini S, Giunciuglio D, Aluigi MG, Proudfoot AE, Alouani S, Wells TN, Mariani G, Rabin RL, Farber JM, Noonan DM (1998) HIV-1 Tat protein mimicry of chemokines. Proc Natl Acad Sci USA 95(22):13153–13158
Pu H, Tian J, Flora G, Lee YW, Nath A, Hennig B, Toborek M (2003) HIV-1 Tat protein upregulates inflammatory mediators and induces monocyte invasion into the brain. Mol Cell Neurosci 24(1):224–237
Agrawal L, Louboutin JP, Reyes BA, Van Bockstaele EJ, Strayer DS (2012) HIV-1 Tat neurotoxicity: a model of acute and chronic exposure, and neuroprotection by gene delivery of antioxidant enzymes. Neurobiol Dis 45(2):657–670. https://doi.org/10.1016/j.nbd.2011.10.005
Badou A, Bennasser Y, Moreau M, Leclerc C, Benkirane M, Bahraoui E (2000) Tat protein of human immunodeficiency virus type 1 induces interleukin-10 in human peripheral blood monocytes: implication of protein kinase C-dependent pathway. J Virol 74(22):10551–10562
Brady J, Kashanchi F (2005) Tat gets the “green” light on transcription initiation. Retrovirology 2:69. https://doi.org/10.1186/1742-4690-2-69
Cullen BR (1991) Regulation of HIV-1 gene expression. FASEB J 5(10):2361–2368
Feinberg MB, Baltimore D, Frankel AD (1991) The role of Tat in the human immunodeficiency virus life cycle indicates a primary effect on transcriptional elongation. Proc Natl Acad Sci USA 88(9):4045–4049
Purcell DF, Martin MA (1993) Alternative splicing of human immunodeficiency virus type 1 mRNA modulates viral protein expression, replication, and infectivity. J Virol 67(11):6365–6378
Truant R, Cullen BR (1999) The arginine-rich domains present in human immunodeficiency virus type 1 Tat and Rev function as direct importin beta-dependent nuclear localization signals. Mol Cell Biol 19(2):1210–1217
Efthymiadis A, Briggs LJ, Jans DA (1998) The HIV-1 Tat nuclear localization sequence confers novel nuclear import properties. J Biol Chem 273(3):1623–1628
Cardarelli F, Serresi M, Bizzarri R, Beltram F (2008) Tuning the transport properties of HIV-1 Tat arginine-rich motif in living cells. Traffic 9(4):528–539. https://doi.org/10.1111/j.1600-0854.2007.00696.x
Smith KM, Himiari Z, Tsimbalyuk S, Forwood JK (2017) Structural Basis for Importin-alpha Binding of the Human Immunodeficiency Virus Tat. Sci Rep 7(1):1650. https://doi.org/10.1038/s41598-017-01853-7
Bres V, Kiernan R, Emiliani S, Benkirane M (2002) Tat acetyl-acceptor lysines are important for human immunodeficiency virus type-1 replication. J Biol Chem 277(25):22215–22221. https://doi.org/10.1074/jbc.M201895200
Fulcher AJ, Sivakumaran H, Jin H, Rawle DJ, Harrich D, Jans DA (2016) The protein arginine methyltransferase PRMT6 inhibits HIV-1 Tat nucleolar retention. Biochim Biophys Acta 1863(2):254–262. https://doi.org/10.1016/j.bbamcr.2015.11.019
Kuppuswamy M, Subramanian T, Srinivasan A, Chinnadurai G (1989) Multiple functional domains of Tat, the trans-activator of HIV-1, defined by mutational analysis. Nucleic Acids Res 17(9):3551–3561
Orsini MJ, Debouck CM (1996) Inhibition of human immunodeficiency virus type 1 and type 2 Tat function by transdominant Tat protein localized to both the nucleus and cytoplasm. J Virol 70(11):8055–8063
He M, Zhang L, Wang X, Huo L, Sun L, Feng C, Jing X, Du D, Liang H, Liu M, Hong Z, Zhou J (2013) Systematic analysis of the functions of lysine acetylation in the regulation of Tat activity. PLoS One 8(6):e67186. https://doi.org/10.1371/journal.pone.0067186
Ott M, Schnolzer M, Garnica J, Fischle W, Emiliani S, Rackwitz HR, Verdin E (1999) Acetylation of the HIV-1 Tat protein by p300 is important for its transcriptional activity. Curr Biol 9(24):1489–1492
D’Orso I, Frankel AD (2009) Tat acetylation modulates assembly of a viral-host RNA-protein transcription complex. Proc Natl Acad Sci USA 106(9):3101–3106. https://doi.org/10.1073/pnas.0900012106
Grisendi S, Mecucci C, Falini B, Pandolfi PP (2006) Nucleophosmin and cancer. Nat Rev Cancer 6(7):493–505. https://doi.org/10.1038/nrc1885
Li YP (1997) Protein B23 is an important human factor for the nucleolar localization of the human immunodeficiency virus protein Tat. J Virol 71(5):4098–4102
Marasco WA, Szilvay AM, Kalland KH, Helland DG, Reyes HM, Walter RJ (1994) Spatial association of HIV-1 tat protein and the nucleolar transport protein B23 in stably transfected Jurkat T-cells. Arch Virol 139(1–2):133–154
Gadad SS, Rajan RE, Senapati P, Chatterjee S, Shandilya J, Dash PK, Ranga U, Kundu TK (2011) HIV-1 infection induces acetylation of NPM1 that facilitates Tat localization and enhances viral transactivation. J Mol Biol 410(5):997–1007. https://doi.org/10.1016/j.jmb.2011.04.009
Boulanger MC, Liang C, Russell RS, Lin R, Bedford MT, Wainberg MA, Richard S (2005) Methylation of Tat by PRMT6 regulates human immunodeficiency virus type 1 gene expression. J Virol 79(1):124–131. https://doi.org/10.1128/JVI.79.1.124-131.2005
Xie B, Invernizzi CF, Richard S, Wainberg MA (2007) Arginine methylation of the human immunodeficiency virus type 1 Tat protein by PRMT6 negatively affects Tat interactions with both cyclin T1 and the Tat transactivation region. J Virol 81(8):4226–4234. https://doi.org/10.1128/JVI.01888-06
Frankel A, Yadav N, Lee J, Branscombe TL, Clarke S, Bedford MT (2002) The novel human protein arginine N-methyltransferase PRMT6 is a nuclear enzyme displaying unique substrate specificity. J Biol Chem 277(5):3537–3543. https://doi.org/10.1074/jbc.M108786200
Yoon CH, Kim SY, Byeon SE, Jeong Y, Lee J, Kim KP, Park J, Bae YS (2015) p53-derived host restriction of HIV-1 replication by protein kinase R-mediated Tat phosphorylation and inactivation. J Virol 89(8):4262–4280. https://doi.org/10.1128/JVI.03087-14
Hernandez-Verdun D, Roussel P, Thiry M, Sirri V, Lafontaine DL (2010) The nucleolus: structure/function relationship in RNA metabolism. Wiley Interdiscip Rev RNA 1(3):415–431. https://doi.org/10.1002/wrna.39
Ponti D, Troiano M, Bellenchi GC, Battaglia PA, Gigliani F (2008) The HIV Tat protein affects processing of ribosomal RNA precursor. BMC Cell Biol 9:32. https://doi.org/10.1186/1471-2121-9-32
Jarboui MA, Bidoia C, Woods E, Roe B, Wynne K, Elia G, Hall WW, Gautier VW (2012) Nucleolar protein trafficking in response to HIV-1 Tat: rewiring the nucleolus. PLoS One 7(11):e48702. https://doi.org/10.1371/journal.pone.0048702
Sonenberg N, Hinnebusch AG (2009) Regulation of translation initiation in eukaryotes: mechanisms and biological targets. Cell 136(4):731–745. https://doi.org/10.1016/j.cell.2009.01.042
Schneider RJ, Shenk T (1987) Impact of virus infection on host cell protein synthesis. Annu Rev Biochem 56:317–332. https://doi.org/10.1146/annurev.bi.56.070187.001533
Bushell M, Sarnow P (2002) Hijacking the translation apparatus by RNA viruses. J Cell Biol 158(3):395–399. https://doi.org/10.1083/jcb.200205044
Debaisieux S, Rayne F, Yezid H, Beaumelle B (2012) The ins and outs of HIV-1 Tat. Traffic 13(3):355–363. https://doi.org/10.1111/j.1600-0854.2011.01286.x
Vendeville A, Rayne F, Bonhoure A, Bettache N, Montcourrier P, Beaumelle B (2004) HIV-1 Tat enters T cells using coated pits before translocating from acidified endosomes and eliciting biological responses. Mol Biol Cell 15(5):2347–2360. https://doi.org/10.1091/mbc.E03-12-0921
Yezid H, Konate K, Debaisieux S, Bonhoure A, Beaumelle B (2009) Mechanism for HIV-1 Tat insertion into the endosome membrane. J Biol Chem 284(34):22736–22746. https://doi.org/10.1074/jbc.M109.023705
Pantano S, Tyagi M, Giacca M, Carloni P (2002) Amino acid modification in the HIV-1 Tat basic domain: insights from molecular dynamics and in vivo functional studies. J Mol Biol 318(5):1331–1339
Tyagi M, Rusnati M, Presta M, Giacca M (2001) Internalization of HIV-1 tat requires cell surface heparan sulfate proteoglycans. J Biol Chem 276(5):3254–3261. https://doi.org/10.1074/jbc.M006701200
Mere J, Morlon-Guyot J, Bonhoure A, Chiche L, Beaumelle B (2005) Acid-triggered membrane insertion of Pseudomonas exotoxin A involves an original mechanism based on pH-regulated tryptophan exposure. J Biol Chem 280(22):21194–21201. https://doi.org/10.1074/jbc.M412656200
De Matteis MA, Godi A (2004) PI-loting membrane traffic. Nat Cell Biol 6(6):487–492. https://doi.org/10.1038/ncb0604-487
Di Paolo G, De Camilli P (2006) Phosphoinositides in cell regulation and membrane dynamics. Nature 443(7112):651–657. https://doi.org/10.1038/nature05185
Boven LA, Noorbakhsh F, Bouma G, van der Zee R, Vargas DL, Pardo C, McArthur JC, Nottet HS, Power C (2007) Brain-derived human immunodeficiency virus-1 Tat exerts differential effects on LTR transactivation and neuroimmune activation. J Neurovirol 13(2):173–184. https://doi.org/10.1080/13550280701258399
Cowley D, Gray LR, Wesselingh SL, Gorry PR, Churchill MJ (2011) Genetic and functional heterogeneity of CNS-derived tat alleles from patients with HIV-associated dementia. J Neurovirol 17(1):70–81. https://doi.org/10.1007/s13365-010-0002-5
Roof P, Ricci M, Genin P, Montano MA, Essex M, Wainberg MA, Gatignol A, Hiscott J (2002) Differential regulation of HIV-1 clade-specific B, C, and E long terminal repeats by NF-kappaB and the Tat transactivator. Virology 296(1):77–83. https://doi.org/10.1006/viro.2001.1397
Dahiya S, Nonnemacher MR, Wigdahl B (2012) Deployment of the human immunodeficiency virus type 1 protein arsenal: combating the host to enhance viral transcription and providing targets for therapeutic development. J Gen Virol 93(Pt 6):1151–1172. https://doi.org/10.1099/vir.0.041186-0
Taylor JP, Pomerantz R, Bagasra O, Chowdhury M, Rappaport J, Khalili K, Amini S (1992) TAR-independent transactivation by Tat in cells derived from the CNS: a novel mechanism of HIV-1 gene regulation. EMBO J 11(9):3395–3403
Hetzer C, Dormeyer W, Schnolzer M, Ott M (2005) Decoding Tat: the biology of HIV Tat posttranslational modifications. Microbes Infect 7(13):1364–1369. https://doi.org/10.1016/j.micinf.2005.06.003
Deng L, Ammosova T, Pumfery A, Kashanchi F, Nekhai S (2002) HIV-1 Tat interaction with RNA polymerase II C-terminal domain (CTD) and a dynamic association with CDK2 induce CTD phosphorylation and transcription from HIV-1 promoter. J Biol Chem 277(37):33922–33929. https://doi.org/10.1074/jbc.M111349200
Ammosova T, Berro R, Jerebtsova M, Jackson A, Charles S, Klase Z, Southerland W, Gordeuk VR, Kashanchi F, Nekhai S (2006) Phosphorylation of HIV-1 Tat by CDK2 in HIV-1 transcription. Retrovirology 3:78. https://doi.org/10.1186/1742-4690-3-78
Ivanov A, Lin X, Ammosova T, Ilatovskiy AV, Kumari N, Lassiter H, Afangbedji N, Niu X, Petukhov MG, Nekhai S (2018) HIV-1 Tat phosphorylation on Ser-16 residue modulates HIV-1 transcription. Retrovirology 15(1):39. https://doi.org/10.1186/s12977-018-0422-5
Stevenson-Lindert LM, Fowler P, Lew J (2003) Substrate specificity of CDK2-cyclin A. What is optimal? J Biol Chem 278(51):50956–50960. https://doi.org/10.1074/jbc.M306546200
Kitagawa M, Higashi H, Jung HK, Suzuki-Takahashi I, Ikeda M, Tamai K, Kato J, Segawa K, Yoshida E, Nishimura S, Taya Y (1996) The consensus motif for phosphorylation by cyclin D1-Cdk4 is different from that for phosphorylation by cyclin A/E-Cdk2. EMBO J 15(24):7060–7069
Selhorst P, Combrinck C, Ndabambi N, Ismail SD, Abrahams MR, Lacerda M, Samsunder N, Garrett N, Abdool Karim Q, Abdool Karim SS, Williamson C (2017) Replication capacity of viruses from acute infection drives HIV-1 disease progression. J Virol. https://doi.org/10.1128/JVI.01806-16
Tyagi S, Ochem A, Tyagi M (2011) DNA-dependent protein kinase interacts functionally with the RNA polymerase II complex recruited at the human immunodeficiency virus (HIV) long terminal repeat and plays an important role in HIV gene expression. J Gen Virol 92(Pt 7):1710–1720. https://doi.org/10.1099/vir.0.029587-0
McMillan NA, Chun RF, Siderovski DP, Galabru J, Toone WM, Samuel CE, Mak TW, Hovanessian AG, Jeang KT, Williams BR (1995) HIV-1 Tat directly interacts with the interferon-induced, double-stranded RNA-dependent kinase. PKR Virol 213(2):413–424. https://doi.org/10.1006/viro.1995.0014
Brand SR, Kobayashi R, Mathews MB (1997) The Tat protein of human immunodeficiency virus type 1 is a substrate and inhibitor of the interferon-induced, virally activated protein kinase, PKR. J Biol Chem 272(13):8388–8395
Garcia MA, Gil J, Ventoso I, Guerra S, Domingo E, Rivas C, Esteban M (2006) Impact of protein kinase PKR in cell biology: from antiviral to antiproliferative action. Microbiol Mol Biol Rev 70(4):1032–1060. https://doi.org/10.1128/MMBR.00027-06
Krishna KH, Vadlamudi Y, Kumar MS (2016) Viral evolved inhibition mechanism of the RNA Dependent protein kinase PKR’s kinase domain, a structural perspective. PLoS One 11(4):e0153680. https://doi.org/10.1371/journal.pone.0153680
Campbell GR, Loret EP (2009) What does the structure-function relationship of the HIV-1 Tat protein teach us about developing an AIDS Vaccine?. Retrovirology 6:50. https://doi.org/10.1186/1742-4690-6-50
Endo-Munoz L, Warby T, Harrich D, McMillan NA (2005) Phosphorylation of HIV Tat by PKR increases interaction with TAR RNA and enhances transcription. Virol J 2:17. https://doi.org/10.1186/1743-422X-2-17
Deng L, de la Fuente C, Fu P, Wang L, Donnelly R, Wade JD, Lambert P, Li H, Lee CG, Kashanchi F (2000) Acetylation of HIV-1 Tat by CBP/P300 increases transcription of integrated HIV-1 genome and enhances binding to core histones. Virology 277(2):278–295. https://doi.org/10.1006/viro.2000.0593
Kiernan RE, Vanhulle C, Schiltz L, Adam E, Xiao H, Maudoux F, Calomme C, Burny A, Nakatani Y, Jeang KT, Benkirane M, Van Lint C (1999) HIV-1 tat transcriptional activity is regulated by acetylation. EMBO J 18(21):6106–6118. https://doi.org/10.1093/emboj/18.21.6106
Dorr A, Kiermer V, Pedal A, Rackwitz HR, Henklein P, Schubert U, Zhou MM, Verdin E, Ott M (2002) Transcriptional synergy between Tat and PCAF is dependent on the binding of acetylated Tat to the PCAF bromodomain. EMBO J 21(11):2715–2723. https://doi.org/10.1093/emboj/21.11.2715
Bres V, Tagami H, Peloponese JM, Loret E, Jeang KT, Nakatani Y, Emiliani S, Benkirane M, Kiernan RE (2002) Differential acetylation of Tat coordinates its interaction with the co-activators cyclin T1 and PCAF. EMBO J 21(24):6811–6819
Col E, Caron C, Seigneurin-Berny D, Gracia J, Favier A, Khochbin S (2001) The histone acetyltransferase, hGCN5, interacts with and acetylates the HIV transactivator, Tat. J Biol Chem 276(30):28179–28184. https://doi.org/10.1074/jbc.M101385200
Kaehlcke K, Dorr A, Hetzer-Egger C, Kiermer V, Henklein P, Schnoelzer M, Loret E, Cole PA, Verdin E, Ott M (2003) Acetylation of Tat defines a cyclinT1-independent step in HIV transactivation. Mol Cell 12(1):167–176
Mujtaba S, He Y, Zeng L, Farooq A, Carlson JE, Ott M, Verdin E, Zhou MM (2002) Structural basis of lysine-acetylated HIV-1 Tat recognition by PCAF bromodomain. Mol Cell 9(3):575–586
Agbottah E, Deng L, Dannenberg LO, Pumfery A, Kashanchi F (2006) Effect of SWI/SNF chromatin remodeling complex on HIV-1 Tat activated transcription. Retrovirology 3:48. https://doi.org/10.1186/1742-4690-3-48
Tang L, Nogales E, Ciferri C (2010) Structure and function of SWI/SNF chromatin remodeling complexes and mechanistic implications for transcription. Prog Biophys Mol Biol 102(2–3):122–128. https://doi.org/10.1016/j.pbiomolbio.2010.05.001
Verdin E, Paras P, Van Lint C (1993) Chromatin disruption in the promoter of human immunodeficiency virus type 1 during transcriptional activation. EMBO J 12(8):3249–3259
Pagans S, Kauder SE, Kaehlcke K, Sakane N, Schroeder S, Dormeyer W, Trievel RC, Verdin E, Schnolzer M, Ott M (2010) The Cellular lysine methyltransferase Set7/9-KMT7 binds HIV-1 TAR RNA, monomethylates the viral transactivator Tat, and enhances HIV transcription. Cell Host Microbe 7(3):234–244. https://doi.org/10.1016/j.chom.2010.02.005
Ali I, Ramage H, Boehm D, Dirk LM, Sakane N, Hanada K, Pagans S, Kaehlcke K, Aull K, Weinberger L, Trievel R, Schnoelzer M, Kamada M, Houtz R, Ott M (2016) The HIV-1 Tat protein is monomethylated at lysine 71 by the lysine methyltransferase KMT7. J Biol Chem 291(31):16240–16248. https://doi.org/10.1074/jbc.M116.735415
Van Duyne R, Easley R, Wu W, Berro R, Pedati C, Klase Z, Kehn-Hall K, Flynn EK, Symer DE, Kashanchi F (2008) Lysine methylation of HIV-1 Tat regulates transcriptional activity of the viral LTR. Retrovirology 5:40. https://doi.org/10.1186/1742-4690-5-40
Mousseau G, Kessing CF, Fromentin R, Trautmann L, Chomont N, Valente ST (2015) The Tat inhibitor didehydro-cortistatin A prevents HIV-1 reactivation from latency. MBio 6(4):e00465. https://doi.org/10.1128/mBio.00465-15
Bullen CK, Laird GM, Durand CM, Siliciano JD, Siliciano RF (2014) New ex vivo approaches distinguish effective and ineffective single agents for reversing HIV-1 latency in vivo. Nat Med 20(4):425–429. https://doi.org/10.1038/nm.3489
Rasmussen TA, Lewin SR (2016) Shocking HIV out of hiding: where are we with clinical trials of latency reversing agents? Curr Opin HIV AIDS 11(4):394–401. https://doi.org/10.1097/COH.0000000000000279
Uchil PD, Quinlan BD, Chan WT, Luna JM, Mothes W (2008) TRIM E3 ligases interfere with early and late stages of the retroviral life cycle. PLoS Pathog 4(2):e16. https://doi.org/10.1371/journal.ppat.0040016
Baldauf HM, Pan X, Erikson E, Schmidt S, Daddacha W, Burggraf M, Schenkova K, Ambiel I, Wabnitz G, Gramberg T, Panitz S, Flory E, Landau NR, Sertel S, Rutsch F, Lasitschka F, Kim B, Konig R, Fackler OT, Keppler OT (2012) SAMHD1 restricts HIV-1 infection in resting CD4(+) T cells. Nat Med 18(11):1682–1687. https://doi.org/10.1038/nm.2964
Bres V, Kiernan RE, Linares LK, Chable-Bessia C, Plechakova O, Treand C, Emiliani S, Peloponese JM, Jeang KT, Coux O, Scheffner M, Benkirane M (2003) A non-proteolytic role for ubiquitin in Tat-mediated transactivation of the HIV-1 promoter. Nat Cell Biol 5(8):754–761. https://doi.org/10.1038/ncb1023
Moll UM, Petrenko O (2003) The MDM2-p53 interaction. Mol Cancer Res 1(14):1001–1008
Yang Y, Ludwig RL, Jensen JP, Pierre SA, Medaglia MV, Davydov IV, Safiran YJ, Oberoi P, Kenten JH, Phillips AC, Weissman AM, Vousden KH (2005) Small molecule inhibitors of HDM2 ubiquitin ligase activity stabilize and activate p53 in cells. Cancer Cell 7(6):547–559. https://doi.org/10.1016/j.ccr.2005.04.029
Garber ME, Wei P, KewalRamani VN, Mayall TP, Herrmann CH, Rice AP, Littman DR, Jones KA (1998) The interaction between HIV-1 Tat and human cyclin T1 requires zinc and a critical cysteine residue that is not conserved in the murine CycT1 protein. Genes Dev 12(22):3512–3527
Faust TB, Li Y, Jang GM, Johnson JR, Yang S, Weiss A, Krogan NJ, Frankel AD (2017) PJA2 ubiquitinates the HIV-1 Tat protein with atypical chain linkages to activate viral transcription. Sci Rep 7:45394. https://doi.org/10.1038/srep45394
El Kharroubi A, Piras G, Zensen R, Martin MA (1998) Transcriptional activation of the integrated chromatin-associated human immunodeficiency virus type 1 promoter. Mol Cell Biol 18(5):2535–2544
D’Orso I, Jang GM, Pastuszak AW, Faust TB, Quezada E, Booth DS, Frankel AD (2012) Transition step during assembly of HIV Tat:P-TEFb transcription complexes and transfer to TAR RNA. Mol Cell Biol 32(23):4780–4793. https://doi.org/10.1128/MCB.00206-12
Garcia JA, Harrich D, Pearson L, Mitsuyasu R, Gaynor RB (1988) Functional domains required for tat-induced transcriptional activation of the HIV-1 long terminal repeat. EMBO J 7(10):3143–3147
Sadaie MR, Mukhopadhyaya R, Benaissa ZN, Pavlakis GN, Wong-Staal F (1990) Conservative mutations in the putative metal-binding region of human immunodeficiency virus tat disrupt virus replication. AIDS Res Hum Retroviruses 6(11):1257–1263. https://doi.org/10.1089/aid.1990.6.1257
Tahirov TH, Babayeva ND, Varzavand K, Cooper JJ, Sedore SC, Price DH (2010) Crystal structure of HIV-1 Tat complexed with human P-TEFb. Nature 465(7299):747–751. https://doi.org/10.1038/nature09131
Rice AP, Carlotti F (1990) Mutational analysis of the conserved cysteine-rich region of the human immunodeficiency virus type 1 Tat protein. J Virol 64(4):1864–1868
Reza SM, Rosetti M, Mathews MB, Pe’ery T (2003) Differential activation of Tat variants in mitogen-stimulated cells: implications for HIV-1 postintegration latency. Virology 310(1):141–156
Huet T, Dazza MC, Brun-Vezinet F, Roelants GE, Wain-Hobson S (1989) A highly defective HIV-1 strain isolated from a healthy Gabonese individual presenting an atypical western blot. AIDS 3(11):707–715
Pantano S, Tyagi M, Giacca M, Carloni P (2004) Molecular dynamics simulations on HIV-1 Tat. Eur Biophys J 33(4):344–351. https://doi.org/10.1007/s00249-003-0358-z
Mele AR, Marino J, Chen K, Pirrone V, Janetopoulos C, Wigdahl B, Klase Z, Nonnemacher MR (2018) Defining the molecular mechanisms of HIV-1 Tat secretion: PtdIns(4,5)P2 at the epicenter. Traffic. https://doi.org/10.1111/tra.12578
Paul RH, Joska JA, Woods C, Seedat S, Engelbrecht S, Hoare J, Heaps J, Valcour V, Ances B, Baker LM, Salminen LE, Stein DJ (2014) Impact of the HIV Tat C30C31S dicysteine substitution on neuropsychological function in patients with clade C disease. J Neurovirol 20(6):627–635. https://doi.org/10.1007/s13365-014-0293-z
Berkhout B, Gatignol A, Rabson AB, Jeang KT (1990) TAR-independent activation of the HIV-1 LTR: evidence that tat requires specific regions of the promoter. Cell 62(4):757–767
Harrich D, Garcia J, Mitsuyasu R, Gaynor R (1990) TAR independent activation of the human immunodeficiency virus in phorbol ester stimulated T lymphocytes. EMBO J 9(13):4417–4423
Southgate CD, Green MR (1991) The HIV-1 Tat protein activates transcription from an upstream DNA-binding site: implications for Tat function. Genes Dev 5(12B):2496–2507
Verhoef K, Koper M, Berkhout B (1997) Determination of the minimal amount of Tat activity required for human immunodeficiency virus type 1 replication. Virology 237(2):228–236. https://doi.org/10.1006/viro.1997.8786
Das AT, Harwig A, Berkhout B (2011) The HIV-1 Tat protein has a versatile role in activating viral transcription. J Virol 85(18):9506–9516. https://doi.org/10.1128/JVI.00650-11
Dandekar DH, Ganesh KN, Mitra D (2004) HIV-1 Tat directly binds to NFkappaB enhancer sequence: role in viral and cellular gene expression. Nucleic Acids Res 32(4):1270–1278. https://doi.org/10.1093/nar/gkh289
Antell GC, Dampier W, Aiamkitsumrit B, Nonnemacher MR, Jacobson JM, Pirrone V, Zhong W, Kercher K, Passic S, Williams JW, Schwartz G, Hershberg U, Krebs FC, Wigdahl B (2016) Utilization of HIV-1 envelope V3 to identify X4- and R5-specific Tat and LTR sequence signatures. Retrovirology 13(1):32. https://doi.org/10.1186/s12977-016-0266-9
Qin JY, Zhang L, Clift KL, Hulur I, Xiang AP, Ren BZ, Lahn BT (2010) Systematic comparison of constitutive promoters and the doxycycline-inducible promoter. PLoS One 5(5):e10611. https://doi.org/10.1371/journal.pone.0010611
Das AT, Harwig A, Vrolijk MM, Berkhout B (2007) The TAR hairpin of human immunodeficiency virus type 1 can be deleted when not required for Tat-mediated activation of transcription. J Virol 81(14):7742–7748. https://doi.org/10.1128/JVI.00392-07
Marzio G, Verhoef K, Vink M, Berkhout B (2001) In vitro evolution of a highly replicating, doxycycline-dependent HIV for applications in vaccine studies. Proc Natl Acad Sci USA 98(11):6342–6347. https://doi.org/10.1073/pnas.111031498
Das AT, Verhoef K, Berkhout B (2004) A conditionally replicating virus as a novel approach toward an HIV vaccine. Methods Enzymol 388:359–379. https://doi.org/10.1016/S0076-6879(04)88028-5
Mahlknecht U, Dichamp I, Varin A, Van Lint C, Herbein G (2008) NF-kappaB-dependent control of HIV-1 transcription by the second coding exon of Tat in T cells. J Leukoc Biol 83(3):718–727. https://doi.org/10.1189/jlb.0607405
Yang L, Morris GF, Lockyer JM, Lu M, Wang Z, Morris CB (1997) Distinct transcriptional pathways of TAR-dependent and TAR-independent human immunodeficiency virus type-1 transactivation by Tat. Virology 235(1):48–64. https://doi.org/10.1006/viro.1997.8672
Taylor JP, Pomerantz RJ, Raj GV, Kashanchi F, Brady JN, Amini S, Khalili K (1994) Central nervous system-derived cells express a kappa B-binding activity that enhances human immunodeficiency virus type 1 transcription in vitro and facilitates TAR-independent transactivation by Tat. J Virol 68(6):3971–3981
Gendelman HE, Lipton SA, Tardieu M, Bukrinsky MI, Nottet HS (1994) The neuropathogenesis of HIV-1 infection. J Leukoc Biol 56(3):389–398
Zhou L, Saksena NK (2013) HIV Associated Neurocognitive Disorders. Infect Dis Rep 5(Suppl 1):e8. https://doi.org/10.4081/idr.2013.s1.e8
Simioni S, Cavassini M, Annoni JM, Rimbault Abraham A, Bourquin I, Schiffer V, Calmy A, Chave JP, Giacobini E, Hirschel B, Du Pasquier RA (2010) Cognitive dysfunction in HIV patients despite long-standing suppression of viremia. AIDS 24(9):1243–1250. https://doi.org/10.1097/QAD.0b013e3283354a7b
Purvis SF, Jacobberger JW, Sramkoski RM, Patki AH, Lederman MM (1995) HIV type 1 Tat protein induces apoptosis and death in Jurkat cells. AIDS Res Hum Retroviruses 11(4):443–450. https://doi.org/10.1089/aid.1995.11.443
Aksenov MY, Aksenova MV, Mactutus CF, Booze RM (2009) Attenuated neurotoxicity of the transactivation-defective HIV-1 Tat protein in hippocampal cell cultures. Exp Neurol 219(2):586–590. https://doi.org/10.1016/j.expneurol.2009.07.005
McCloskey TW, Ott M, Tribble E, Khan SA, Teichberg S, Paul MO, Pahwa S, Verdin E, Chirmule N (1997) Dual role of HIV Tat in regulation of apoptosis in T cells. J Immunol 158(2):1014–1019
Kruman II, Nath A, Mattson MP (1998) HIV-1 protein Tat induces apoptosis of hippocampal neurons by a mechanism involving caspase activation, calcium overload, and oxidative stress. Exp Neurol 154(2):276–288. https://doi.org/10.1006/exnr.1998.6958
Li CJ, Friedman DJ, Wang C, Metelev V, Pardee AB (1995) Induction of apoptosis in uninfected lymphocytes by HIV-1 Tat protein. Science 268(5209):429–431
Pantaleo G, Fauci AS (1995) Apoptosis in HIV infection. Nat Med 1(2):118–120
Sood V, Ranjan R, Banerjea AC (2008) Functional analysis of HIV-1 subtypes B and C HIV-1 Tat exons and RGD/QGD motifs with respect to Tat-mediated transactivation and apoptosis. AIDS 22(13):1683–1685. https://doi.org/10.1097/QAD.0b013e3282f56114
Chen D, Wang M, Zhou S, Zhou Q (2002) HIV-1 Tat targets microtubules to induce apoptosis, a process promoted by the pro-apoptotic Bcl-2 relative Bim. EMBO J 21(24):6801–6810
Peter ME, Ehret A, Berndt C, Krammer PH (1997) AIDS and the death receptors. Br Med Bull 53(3):604–616
Herbeuval JP, Grivel JC, Boasso A, Hardy AW, Chougnet C, Dolan MJ, Yagita H, Lifson JD, Shearer GM (2005) CD4 + T-cell death induced by infectious and noninfectious HIV-1: role of type 1 interferon-dependent, TRAIL/DR5-mediated apoptosis. Blood 106(10):3524–3531. https://doi.org/10.1182/blood-2005-03-1243
Garden GA, Budd SL, Tsai E, Hanson L, Kaul M, D’Emilia DM, Friedlander RM, Yuan J, Masliah E, Lipton SA (2002) Caspase cascades in human immunodeficiency virus-associated neurodegeneration. J Neurosci 22(10):4015–4024. (20026351)
Taylor RC, Cullen SP, Martin SJ (2008) Apoptosis: controlled demolition at the cellular level. Nat Rev Mol Cell Biol 9(3):231–241. https://doi.org/10.1038/nrm2312
Campbell GR, Watkins JD, Esquieu D, Pasquier E, Loret EP, Spector SA (2005) The C terminus of HIV-1 Tat modulates the extent of CD178-mediated apoptosis of T cells. J Biol Chem 280(46):38376–38382. https://doi.org/10.1074/jbc.M506630200
Bartz SR, Emerman M (1999) Human immunodeficiency virus type 1 Tat induces apoptosis and increases sensitivity to apoptotic signals by up-regulating FLICE/caspase-8. J Virol 73(3):1956–1963
Elmore S (2007) Apoptosis: a review of programmed cell death. Toxicol Pathol 35(4):495–516. https://doi.org/10.1080/01926230701320337
Kamori D, Ueno T (2017) HIV-1 Tat and viral latency: what we can learn from naturally occurring sequence variations. Front Microbiol 8:80. https://doi.org/10.3389/fmicb.2017.00080
Campbell GR, Pasquier E, Watkins J, Bourgarel-Rey V, Peyrot V, Esquieu D, Barbier P, de Mareuil J, Braguer D, Kaleebu P, Yirrell DL, Loret EP (2004) The glutamine-rich region of the HIV-1 Tat protein is involved in T-cell apoptosis. J Biol Chem 279(46):48197–48204. https://doi.org/10.1074/jbc.M406195200
de Mareuil J, Carre M, Barbier P, Campbell GR, Lancelot S, Opi S, Esquieu D, Watkins JD, Prevot C, Braguer D, Peyrot V, Loret EP (2005) HIV-1 Tat protein enhances microtubule polymerization. Retrovirology 2:5. https://doi.org/10.1186/1742-4690-2-5
Battaglia PA, Zito S, Macchini A, Gigliani F (2001) A Drosophila model of HIV-Tat-related pathogenicity. J Cell Sci 114(Pt 15):2787–2794
Alizon M, Wain-Hobson S, Montagnier L, Sonigo P (1986) Genetic variability of the AIDS virus: nucleotide sequence analysis of two isolates from African patients. Cell 46(1):63–74
Egele C, Barbier P, Didier P, Piemont E, Allegro D, Chaloin O, Muller S, Peyrot V, Mely Y (2008) Modulation of microtubule assembly by the HIV-1 Tat protein is strongly dependent on zinc binding to Tat. Retrovirology 5:62. https://doi.org/10.1186/1742-4690-5-62
Strack PR, Frey MW, Rizzo CJ, Cordova B, George HJ, Meade R, Ho SP, Corman J, Tritch R, Korant BD (1996) Apoptosis mediated by HIV protease is preceded by cleavage of Bcl-2. Proc Natl Acad Sci USA 93(18):9571–9576
Jacotot E, Ferri KF, El Hamel C, Brenner C, Druillennec S, Hoebeke J, Rustin P, Metivier D, Lenoir C, Geuskens M, Vieira HL, Loeffler M, Belzacq AS, Briand JP, Zamzami N, Edelman L, Xie ZH, Reed JC, Roques BP, Kroemer G (2001) Control of mitochondrial membrane permeabilization by adenine nucleotide translocator interacting with HIV-1 viral protein rR and Bcl-2. J Exp Med 193(4):509–519
Zauli G, Gibellini D (1996) The human immunodeficiency virus type-1 (HIV-1) Tat protein and Bcl-2 gene expression. Leuk Lymphoma 23(5–6):551–560. https://doi.org/10.3109/10428199609054864
Zauli G, Gibellini D, Caputo A, Bassini A, Negrini M, Monne M, Mazzoni M, Capitani S (1995) The human immunodeficiency virus type-1 Tat protein upregulates Bcl-2 gene expression in Jurkat T-cell lines and primary peripheral blood mononuclear cells. Blood 86(10):3823–3834
Sastry KJ, Marin MC, Nehete PN, McConnell K, el-Naggar AK, McDonnell TJ (1996) Expression of human immunodeficiency virus type I tat results in down-regulation of bcl-2 and induction of apoptosis in hematopoietic cells. Oncogene 13(3):487–493
Zauli G, Gibellini D, Milani D, Mazzoni M, Borgatti P, La Placa M, Capitani S (1993) Human immunodeficiency virus type 1 Tat protein protects lymphoid, epithelial, and neuronal cell lines from death by apoptosis. Cancer Res 53(19):4481–4485
Gibellini D, Caputo A, Celeghini C, Bassini A, La Placa M, Capitani S, Zauli G (1995) Tat-expressing Jurkat cells show an increased resistance to different apoptotic stimuli, including acute human immunodeficiency virus-type 1 (HIV-1) infection. Br J Haematol 89(1):24–33
Zhang M, Li X, Pang X, Ding L, Wood O, Clouse KA, Hewlett I, Dayton AI (2002) Bcl-2 upregulation by HIV-1 Tat during infection of primary human macrophages in culture. J Biomed Sci 9(2):133–139. https://doi.org/10.1159/000048209
Lafrenie RM, Wahl LM, Epstein JS, Hewlett IK, Yamada KM, Dhawan S (1996) HIV-1-Tat modulates the function of monocytes and alters their interactions with microvessel endothelial cells. A mechanism of HIV pathogenesis. J Immunol 156(4):1638–1645
Toborek M, Lee YW, Pu H, Malecki A, Flora G, Garrido R, Hennig B, Bauer HC, Nath A (2003) HIV-Tat protein induces oxidative and inflammatory pathways in brain endothelium. J Neurochem 84(1):169–179
Raidel SM, Haase C, Jansen NR, Russ RB, Sutliff RL, Velsor LW, Day BJ, Hoit BD, Samarel AM, Lewis W (2002) Targeted myocardial transgenic expression of HIV Tat causes cardiomyopathy and mitochondrial damage. Am J Physiol Heart Circ Physiol 282(5):H1672–H1678. https://doi.org/10.1152/ajpheart.00955.2001
Paladugu R, Fu W, Conklin BS, Lin PH, Lumsden AB, Yao Q, Chen C (2003) Hiv Tat protein causes endothelial dysfunction in porcine coronary arteries. J Vasc Surg 38(3):549–555. (discussion 555–546)
Rusnati M, Presta M (2002) HIV-1 Tat protein and endothelium: from protein/cell interaction to AIDS-associated pathologies. Angiogenesis 5(3):141–151
Koch S, Claesson-Welsh L (2012) Signal transduction by vascular endothelial growth factor receptors. Cold Spring Harb Perspect Med 2(7):a006502. https://doi.org/10.1101/cshperspect.a006502
Albini A, Soldi R, Giunciuglio D, Giraudo E, Benelli R, Primo L, Noonan D, Salio M, Camussi G, Rockl W, Bussolino F (1996) The angiogenesis induced by HIV-1 tat protein is mediated by the Flk-1/KDR receptor on vascular endothelial cells. Nat Med 2(12):1371–1375
Albini A, Benelli R, Presta M, Rusnati M, Ziche M, Rubartelli A, Paglialunga G, Bussolino F, Noonan D (1996) HIV-tat protein is a heparin-binding angiogenic growth factor. Oncogene 12(2):289–297
Ferrara N, Gerber HP, LeCouter J (2003) The biology of VEGF and its receptors. Nat Med 9(6):669–676. https://doi.org/10.1038/nm0603-669
Dhawan S, Puri RK, Kumar A, Duplan H, Masson JM, Aggarwal BB (1997) Human immunodeficiency virus-1-tat protein induces the cell surface expression of endothelial leukocyte adhesion molecule-1, vascular cell adhesion molecule-1, and intercellular adhesion molecule-1 in human endothelial cells. Blood 90(4):1535–1544
Mitola S, Soldi R, Zanon I, Barra L, Gutierrez MI, Berkhout B, Giacca M, Bussolino F (2000) Identification of specific molecular structures of human immunodeficiency virus type 1 Tat relevant for its biological effects on vascular endothelial cells. J Virol 74(1):344–353
Toborek M, Lee YW, Flora G, Pu H, Andras IE, Wylegala E, Hennig B, Nath A (2005) Mechanisms of the blood-brain barrier disruption in HIV-1 infection. Cell Mol Neurobiol 25(1):181–199
Vene R, Benelli R, Noonan DM, Albini A (2000) HIV-Tat dependent chemotaxis and invasion, key aspects of tat mediated pathogenesis. Clin Exp Metastasis 18(7):533–538
Benelli R, Mortarini R, Anichini A, Giunciuglio D, Noonan DM, Montalti S, Tacchetti C, Albini A (1998) Monocyte-derived dendritic cells and monocytes migrate to HIV-Tat RGD and basic peptides. AIDS 12(3):261–268
Albini A, Benelli R, Giunciuglio D, Cai T, Mariani G, Ferrini S, Noonan DM (1998) Identification of a novel domain of HIV tat involved in monocyte chemotaxis. J Biol Chem 273(26):15895–15900
Premack BA, Schall TJ (1996) Chemokine receptors: gateways to inflammation and infection. Nat Med 2(11):1174–1178
Conant K, Garzino-Demo A, Nath A, McArthur JC, Halliday W, Power C, Gallo RC, Major EO (1998) Induction of monocyte chemoattractant protein-1 in HIV-1 Tat-stimulated astrocytes and elevation in AIDS dementia. Proc Natl Acad Sci USA 95(6):3117–3121
Bonwetsch R, Croul S, Richardson MW, Lorenzana C, Del Valle L, Sverstiuk AE, Amini S, Morgello S, Khalili K, Rappaport J (1999) Role of HIV-1 Tat and CC chemokine MIP-1alpha in the pathogenesis of HIV associated central nervous system disorders. J Neurovirol 5(6):685–694
Weiss JM, Nath A, Major EO, Berman JW (1999) HIV-1 Tat induces monocyte chemoattractant protein-1-mediated monocyte transmigration across a model of the human blood-brain barrier and up-regulates CCR5 expression on human monocytes. J Immunol 163(5):2953–2959
Geiss GK, Bumgarner RE, An MC, Agy MB, van ‘t Wout AB, Hammersmark E, Carter VS, Upchurch D, Mullins JI, Katze MG (2000) Large-scale monitoring of host cell gene expression during HIV-1 infection using cDNA microarrays. Virology 266(1):8–16. https://doi.org/10.1006/viro.1999.0044
Fan J, Bass HZ, Fahey JL (1993) Elevated IFN-gamma and decreased IL-2 gene expression are associated with HIV infection. J Immunol 151(9):5031–5040
Lafrenie RM, Wahl LM, Epstein JS, Yamada KM, Dhawan S (1997) Activation of monocytes by HIV-Tat treatment is mediated by cytokine expression. J Immunol 159(8):4077–4083
Nath A, Conant K, Chen P, Scott C, Major EO (1999) Transient exposure to HIV-1 Tat protein results in cytokine production in macrophages and astrocytes. A hit and run phenomenon. J Biol Chem 274(24):17098–17102
Kiernan R, Bres V, Ng RW, Coudart MP, El Messaoudi S, Sardet C, Jin DY, Emiliani S, Benkirane M (2003) Post-activation turn-off of NF-kappa B-dependent transcription is regulated by acetylation of p65. J Biol Chem 278(4):2758–2766. https://doi.org/10.1074/jbc.M209572200
Lenardo MJ, Baltimore D (1989) NF-kappa B: a pleiotropic mediator of inducible and tissue-specific gene control. Cell 58(2):227–229
Kwon HS, Brent MM, Getachew R, Jayakumar P, Chen LF, Schnolzer M, McBurney MW, Marmorstein R, Greene WC, Ott M (2008) Human immunodeficiency virus type 1 Tat protein inhibits the SIRT1 deacetylase and induces T cell hyperactivation. Cell Host Microbe 3(3):158–167. https://doi.org/10.1016/j.chom.2008.02.002
Bachmann MF, Oxenius A (2007) Interleukin 2: from immunostimulation to immunoregulation and back again. EMBO Rep 8(12):1142–1148. https://doi.org/10.1038/sj.embor.7401099
Ott M, Emiliani S, Van Lint C, Herbein G, Lovett J, Chirmule N, McCloskey T, Pahwa S, Verdin E (1997) Immune hyperactivation of HIV-1-infected T cells mediated by Tat and the CD28 pathway. Science 275(5305):1481–1485
Carvallo L, Lopez L, Fajardo JE, Jaureguiberry-Bravo M, Fiser A, Berman JW (2017) HIV-Tat regulates macrophage gene expression in the context of neuroAIDS. PLoS One 12(6):e0179882. https://doi.org/10.1371/journal.pone.0179882
Bouwman RD, Palser A, Parry CM, Coulter E, Rasaiyaah J, Kellam P, Jenner RG (2014) Human immunodeficiency virus Tat associates with a specific set of cellular RNAs. Retrovirology 11:53. https://doi.org/10.1186/1742-4690-11-53
Sharma V, Knobloch TJ, Benjamin D (1995) Differential expression of cytokine genes in HIV-1 tat transfected T and B cell lines. Biochem Biophys Res Commun 208(2):704–713. https://doi.org/10.1006/bbrc.1995.1395
Dabrowska A, Kim N, Aldovini A (2008) Tat-induced FOXO3a is a key mediator of apoptosis in HIV-1-infected human CD4 + T lymphocytes. J Immunol 181(12):8460–8477
Izmailova E, Bertley FM, Huang Q, Makori N, Miller CJ, Young RA, Aldovini A (2003) HIV-1 Tat reprograms immature dendritic cells to express chemoattractants for activated T cells and macrophages. Nat Med 9(2):191–197. https://doi.org/10.1038/nm822
Ranjbar S, Rajsbaum R, Goldfeld AE (2006) Transactivator of transcription from HIV type 1 subtype E selectively inhibits TNF gene expression via interference with chromatin remodeling of the TNF locus. J Immunol 176(7):4182–4190
Karin M, Lin A (2002) NF-kappaB at the crossroads of life and death. Nat Immunol 3(3):221–227. https://doi.org/10.1038/ni0302-221
Israel N, Hazan U, Alcami J, Munier A, Arenzana-Seisdedos F, Bachelerie F, Israel A, Virelizier JL (1989) Tumor necrosis factor stimulates transcription of HIV-1 in human T lymphocytes, independently and synergistically with mitogens. J Immunol 143(12):3956–3960
Hiscott J, Kwon H, Genin P (2001) Hostile takeovers: viral appropriation of the NF-kappaB pathway. J Clin Invest 107(2):143–151. https://doi.org/10.1172/JCI11918
Nath A, Psooy K, Martin C, Knudsen B, Magnuson DS, Haughey N, Geiger JD (1996) Identification of a human immunodeficiency virus type 1 Tat epitope that is neuroexcitatory and neurotoxic. J Virol 70(3):1475–1480
Li W, Huang Y, Reid R, Steiner J, Malpica-Llanos T, Darden TA, Shankar SK, Mahadevan A, Satishchandra P, Nath A (2008) NMDA receptor activation by HIV-Tat protein is clade dependent. J Neurosci 28(47):12190–12198. https://doi.org/10.1523/JNEUROSCI.3019-08.2008
Dawson VL, Dawson TM, Bartley DA, Uhl GR, Snyder SH (1993) Mechanisms of nitric oxide-mediated neurotoxicity in primary brain cultures. J Neurosci 13(6):2651–2661
Sengpiel B, Preis E, Krieglstein J, Prehn JH (1998) NMDA-induced superoxide production and neurotoxicity in cultured rat hippocampal neurons: role of mitochondria. Eur J Neurosci 10(5):1903–1910
Bertrand SJ, Aksenova MV, Mactutus CF, Booze RM (2013) HIV-1 Tat protein variants: critical role for the cysteine region in synaptodendritic injury. Exp Neurol 248:228–235. https://doi.org/10.1016/j.expneurol.2013.06.020
Zhang W, Benson DL (2001) Stages of synapse development defined by dependence on F-actin. J Neurosci 21(14):5169–5181
Mattson MP, Cheng B, Davis D, Bryant K, Lieberburg I, Rydel RE (1992) beta-Amyloid peptides destabilize calcium homeostasis and render human cortical neurons vulnerable to excitotoxicity. J Neurosci 12(2):376–389
Loo DT, Copani A, Pike CJ, Whittemore ER, Walencewicz AJ, Cotman CW (1993) Apoptosis is induced by beta-amyloid in cultured central nervous system neurons. Proc Natl Acad Sci USA 90(17):7951–7955
Holscher C (2005) Development of beta-amyloid-induced neurodegeneration in Alzheimer’s disease and novel neuroprotective strategies. Rev Neurosci 16(3):181–212
Green DA, Masliah E, Vinters HV, Beizai P, Moore DJ, Achim CL (2005) Brain deposition of beta-amyloid is a common pathologic feature in HIV positive patients. AIDS 19(4):407–411
Achim CL, Adame A, Dumaop W, Everall IP, Masliah E, Neurobehavioral Research C (2009) Increased accumulation of intraneuronal amyloid beta in HIV-infected patients. J Neuroimmune Pharmacol 4(2):190–199. https://doi.org/10.1007/s11481-009-9152-8
Chen X, Hui L, Geiger NH, Haughey NJ, Geiger JD (2013) Endolysosome involvement in HIV-1 transactivator protein-induced neuronal amyloid beta production. Neurobiol Aging 34(10):2370–2378. https://doi.org/10.1016/j.neurobiolaging.2013.04.015
Nixon RA, Cataldo AM (1995) The endosomal-lysosomal system of neurons: new roles. Trends Neurosci 18(11):489–496
Bahr BA, Bendiske J (2002) The neuropathogenic contributions of lysosomal dysfunction. J Neurochem 83(3):481–489
Annaert W, De Strooper B (2002) A cell biological perspective on Alzheimer’s disease. Annu Rev Cell Dev Biol 18:25–51. https://doi.org/10.1146/annurev.cellbio.18.020402.142302
Kim J, Yoon JH, Kim YS (2013) HIV-1 Tat interacts with and regulates the localization and processing of amyloid precursor protein. PLoS One 8(11):e77972. https://doi.org/10.1371/journal.pone.0077972
Hategan A, Bianchet MA, Steiner J, Karnaukhova E, Masliah E, Fields A, Lee MH, Dickens AM, Haughey N, Dimitriadis EK, Nath A (2017) HIV Tat protein and amyloid-beta peptide form multifibrillar structures that cause neurotoxicity. Nat Struct Mol Biol 24(4):379–386. https://doi.org/10.1038/nsmb.3379
Aksenov MY, Aksenova MV, Mactutus CF, Booze RM (2010) HIV-1 protein-mediated amyloidogenesis in rat hippocampal cell cultures. Neurosci Lett 475(3):174–178. https://doi.org/10.1016/j.neulet.2010.03.073
Johri MK, Sharma N, Singh SK (2015) HIV Tat protein: Is Tat-C much trickier than Tat-B? J Med Virol 87(8):1334–1343. https://doi.org/10.1002/jmv.24182
Kurosu T, Mukai T, Komoto S, Ibrahim MS, Li YG, Kobayashi T, Tsuji S, Ikuta K (2002) Human immunodeficiency virus type 1 subtype C exhibits higher transactivation activity of Tat than subtypes B and E. Microbiol Immunol 46(11):787–799
Gandhi N, Saiyed Z, Thangavel S, Rodriguez J, Rao KV, Nair MP (2009) Differential effects of HIV type 1 clade B and clade C Tat protein on expression of proinflammatory and antiinflammatory cytokines by primary monocytes. AIDS Res Hum Retroviruses 25(7):691–699. https://doi.org/10.1089/aid.2008.0299
Bayes-Genis A, Barallat J, Richards AM (2016) A test in context: neprilysin: function, inhibition, and biomarker. J Am Coll Cardiol 68(6):639–653. https://doi.org/10.1016/j.jacc.2016.04.060
Rempel HC, Pulliam L (2005) HIV-1 Tat inhibits neprilysin and elevates amyloid beta. AIDS 19(2):127–135
Daily A, Nath A, Hersh LB (2006) Tat peptides inhibit neprilysin. J Neurovirol 12(3):153–160. https://doi.org/10.1080/13550280600760677
Hamley IW (2012) The amyloid beta peptide: a chemist’s perspective. Role in Alzheimer’s and fibrillization. Chem Rev 112(10):5147–5192. https://doi.org/10.1021/cr3000994
Butterfield DA (2002) Amyloid beta-peptide (1–42)-induced oxidative stress and neurotoxicity: implications for neurodegeneration in Alzheimer’s disease brain. A review. Free Radic Res 36(12):1307–1313
Tanzi RE, Bertram L (2005) Twenty years of the Alzheimer’s disease amyloid hypothesis: a genetic perspective. Cell 120(4):545–555. https://doi.org/10.1016/j.cell.2005.02.008
Allen TM, Altfeld M, Geer SC, Kalife ET, Moore C, O’Sullivan KM, Desouza I, Feeney ME, Eldridge RL, Maier EL, Kaufmann DE, Lahaie MP, Reyor L, Tanzi G, Johnston MN, Brander C, Draenert R, Rockstroh JK, Jessen H, Rosenberg ES, Mallal SA, Walker BD (2005) Selective escape from CD8 + T-cell responses represents a major driving force of human immunodeficiency virus type 1 (HIV-1) sequence diversity and reveals constraints on HIV-1 evolution. J Virol 79(21):13239–13249. https://doi.org/10.1128/JVI.79.21.13239-13249.2005
Allen TM, O’Connor DH, Jing P, Dzuris JL, Mothe BR, Vogel TU, Dunphy E, Liebl ME, Emerson C, Wilson N, Kunstman KJ, Wang X, Allison DB, Hughes AL, Desrosiers RC, Altman JD, Wolinsky SM, Sette A, Watkins DI (2000) Tat-specific cytotoxic T lymphocytes select for SIV escape variants during resolution of primary viraemia. Nature 407(6802):386–390. https://doi.org/10.1038/35030124
Xiao H, Neuveut C, Tiffany HL, Benkirane M, Rich EA, Murphy PM, Jeang KT (2000) Selective CXCR4 antagonism by Tat: implications for in vivo expansion of coreceptor use by HIV-1. Proc Natl Acad Sci USA 97(21):11466–11471. https://doi.org/10.1073/pnas.97.21.11466
Desfosses Y, Solis M, Sun Q, Grandvaux N, Van Lint C, Burny A, Gatignol A, Wainberg MA, Lin R, Hiscott J (2005) Regulation of human immunodeficiency virus type 1 gene expression by clade-specific Tat proteins. J Virol 79(14):9180–9191. https://doi.org/10.1128/JVI.79.14.9180-9191.2005
Landry JJ, Pyl PT, Rausch T, Zichner T, Tekkedil MM, Stutz AM, Jauch A, Aiyar RS, Pau G, Delhomme N, Gagneur J, Korbel JO, Huber W, Steinmetz LM (2013) The genomic and transcriptomic landscape of a HeLa cell line. G3 (Bethesda) 3(8):1213–1224. https://doi.org/10.1534/g3.113.005777
Frattini A, Fabbri M, Valli R, De Paoli E, Montalbano G, Gribaldo L, Pasquali F, Maserati E (2015) High variability of genomic instability and gene expression profiling in different HeLa clones. Sci Rep 5:15377. https://doi.org/10.1038/srep15377
Mousseau G, Clementz MA, Bakeman WN, Nagarsheth N, Cameron M, Shi J, Baran P, Fromentin R, Chomont N, Valente ST (2012) An analog of the natural steroidal alkaloid cortistatin A potently suppresses Tat-dependent HIV transcription. Cell Host Microbe 12(1):97–108. https://doi.org/10.1016/j.chom.2012.05.016
Ferrucci A, Nonnemacher MR, Wigdahl B (2011) Human immunodeficiency virus viral protein R as an extracellular protein in neuropathogenesis. Adv Virus Res 81:165–199. https://doi.org/10.1016/B978-0-12-385885-6.00010-9
James T, Nonnemacher MR, Wigdahl B, Krebs FC (2016) Defining the roles for Vpr in HIV-1-associated neuropathogenesis. J Neurovirol 22(4):403–415. https://doi.org/10.1007/s13365-016-0436-5
Dampier W, Antell GC, Aiamkitsumrit B, Nonnemacher MR, Jacobson JM, Pirrone V, Zhong W, Kercher K, Passic S, Williams JW, James T, Devlin KN, Giovannetti T, Libon DJ, Szep Z, Ehrlich GD, Wigdahl B, Krebs FC (2017) Specific amino acids in HIV-1 Vpr are significantly associated with differences in patient neurocognitive status. J Neurovirol 23(1):113–124. https://doi.org/10.1007/s13365-016-0462-3
Hogan TH, Nonnemacher MR, Krebs FC, Henderson A, Wigdahl B (2003) HIV-1 Vpr binding to HIV-1 LTR C/EBP cis-acting elements and adjacent regions is sequence-specific. Biomed Pharmacother 57(1):41–48
Yiannopoulou KG, Papageorgiou SG (2013) Current and future treatments for Alzheimer’s disease. Ther Adv Neurol Disord 6(1):19–33. https://doi.org/10.1177/1756285612461679
Rygiel K (2016) Novel strategies for Alzheimer’s disease treatment: An overview of anti-amyloid beta monoclonal antibodies. Indian J Pharmacol 48(6):629–636. https://doi.org/10.4103/0253-7613.194867
Funding
The authors were funded in part by the Public Health Service, National Institutes of Health, through grants from the National Institute of Neurological Disorders and Stroke (NINDS) R01 NS089435 (PI, Michael R. Nonnemacher), the NIMH Comprehensive NeuroAIDS Center (CNAC) P30 MH092177 (Kamel Khalili, PI; Brian Wigdahl, PI of the Drexel subcontract involving the Clinical and Translational Research Support Core) and under the Ruth L. Kirschstein National Research Service Award T32 MH079785 (PI, Jay Rappaport; with Brian Wigdahl serving as the PI of the Drexel University College of Medicine component and Olimpia Meucci as Co-Director). The contents of the paper are solely the responsibility of the authors and do not necessarily represent the official views of the NIH.
Author information
Authors and Affiliations
Corresponding author
Ethics declarations
Conflict of interest
The authors declare that they have no conflict of interest.
Additional information
Edited by: Roberto F. Speck.
Publisher’s Note
Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.
Rights and permissions
About this article
Cite this article
Spector, C., Mele, A.R., Wigdahl, B. et al. Genetic variation and function of the HIV-1 Tat protein. Med Microbiol Immunol 208, 131–169 (2019). https://doi.org/10.1007/s00430-019-00583-z
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s00430-019-00583-z