Abstract
The Hsp70/Hsp90 organising protein (Hop), also known as stress-inducible protein 1 (STI1), has received considerable attention for diverse cellular functions in both healthy and diseased states. There is extensive evidence that intracellular Hop is a co-chaperone of the major chaperones Hsp70 and Hsp90, playing an important role in the productive folding of Hsp90 client proteins. Consequently, Hop is implicated in a number of key signalling pathways, including aberrant pathways leading to cancer. However, Hop is also secreted and it is now well established that Hop also serves as a receptor for the prion protein, PrPC. The intracellular and extracellular forms of Hop most likely represent two different isoforms, although the molecular determinants of these divergent functions are yet to be identified. There is also a growing body of research that reports the involvement of Hop in cellular activities that appear independent of either chaperones or PrPC. While Hop has been shown to have various cellular functions, its biological function remains elusive. However, recent knockout studies in mammals suggest that Hop has an important role in embryonic development. This review provides a critical overview of the latest molecular, cellular and biological research on Hop, critically evaluating its function in healthy systems and how this function is adapted in diseases states.
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References
Agarraberes FA, Dice JF (2001) A molecular chaperone complex at the lysosomal membrane is required for protein translocation. J Cell Sci 114:2491–2499
Allan RK, Ratajczak T (2011) Versatile TPR domains accommodate different modes of target protein recognition and function. Cell Stress Chaperones 16:353–367
Amemiya CT, Alfoldi J, Lee AP et al (2013) The African coelacanth genome provides insights into tetrapod evolution. Nature 496:311–316
Americo TA, Chiarini LB, Linden R (2007) Signaling induced by hop/STI-1 depends on endocytosis. Biochem Biophys Res Commun 358:620–625
Andreassen R, Lunner S, Hoyheim B (2009) Characterization of full-length sequenced cDNA inserts (FLIcs) from Atlantic salmon (Salmo salar). BMC Genomics 10:502
Angeletti PC, Walker D, Panganiban AT (2002) Small glutamine-rich protein/viral protein U-binding protein is a novel cochaperone that affects heat shock protein 70 activity. Cell Stress Chaperones 7:258–268
Arantes C, Nomizo R, Lopes MH et al (2009) Prion protein and its ligand stress inducible protein 1 regulate astrocyte development. Glia 57:1439–1449
Ardi VC, Alexander LD, Johnson VA et al (2011) Macrocycles that inhibit the binding between heat shock protein 90 and TPR-containing proteins. ACS Chem Biol 6:1357–1366
Arruda-Carvalho M, Njaine B, Silveira MS et al (2007) Hop/STI1 modulates retinal proliferation and cell death independent of PrPC. Biochem Biophys Res Commun 361:474–480
Barrott JJ, Haystead TAJ (2013) Hsp90, an unlikely ally in the war on cancer. FEBS J 280:1381–1396
Beraldo FH, Arantes CP, Santos TG et al (2010) Role of α7 nicotinic acetylcholine receptor in calcium signaling induced by prion protein interaction with stress-inducible protein. J Biol Chem 285:36542–36550
Beraldo FH, Soares IN, Goncalves DF et al (2013) Stress-inducible phosphoprotein 1 has unique cochaperone activity during development and regulates cellular response to ischemia via the prion protein. FASEB J 27:3594–3607
Blatch GL, Lässle M, Zetter BR et al (1997) Isolation of a mouse cDNA encoding mSTI1, a stress-inducible protein containing the TPR motif. Gene 194:277–282
Boschelli F, Golas JM, Petersen R et al (2010) A cell-based screen for inhibitors of protein folding and degradation. Cell Stress Chaperones 15:913–927
Braunschweig D, Krakowiak P, Duncanson P et al (2013) Autism-specific maternal autoantibodies recognize critical proteins in developing brain. Transl Psychiatry 3:e277
Brinker A, Scheufler C, Von Der Mülbe F et al (2002) Ligand discrimination by TPR domains. Relevance and selectivity of EEVD-recognition in Hsp70·Hop·Hsp90 complexes. J Biol Chem 277:19265–19275
Caetano FA, Lopes MH, Hajj GNM et al (2008) Endocytosis of prion protein is required for ERK1/2 signaling induced by stress-inducible protein 1. J Neurosci 28:6691–6702
Caplan AJ, Mandal AK, Theodoraki MA (2007) Molecular chaperones and protein kinase quality control. Trends Cell Biol 17:87–92
Carrigan PE, Nelson GM, Roberts PJ et al (2004) Multiple domains of the Co-chaperone Hop are important for Hsp70 binding. J Biol Chem 279:16185–16193
Carrigan PE, Riggs DL, Chinkers M et al (2005) Functional comparison of human and Drosophila Hop reveals novel role in steroid receptor maturation. J Biol Chem 280:8906–8911
Chang HCJ, Nathan DF, Lindquist S (1997) In vivo analysis of the Hsp90 cochaperone Sti1 (p60). Mol Cell Biol 17:318–325
Chao A, Lai CH, Tsai CL et al (2013) Tumor stress-induced phosphoprotein1 (STIP1) as a prognostic biomarker in ovarian cancer. PLoS One 8:e57084
Chen S, Smith DF (1998) Hop as an adaptor in the heat shock protein 70 (Hsp70) and Hsp90 chaperone machinery. J Biol Chem 273:35194–35200
Chen S, Prapapanich V, Rimerman RA et al (1996) Interactions of p60, a mediator of progesterone receptor assembly, with heat shock proteins Hsp90 and Hsp70. Mol Endocrinol 10:682–693
Chen L, Hamada S, Fujiwara M et al (2010) The Hop/Sti1-Hsp90 chaperone complex facilitates the maturation and transport of a PAMP receptor in rice innate immunity. Cell Host Microbe 7:185–196
Chiarini LB, Freitas ARO, Zanata SM et al (2002) Cellular prion protein transduces neuroprotective signals. EMBO J 21:3317–3326
Chiosis G (2006) Targeting chaperones in transformed systems—a focus on Hsp90 and cancer. Expert Opin Ther Targets 10:37–50
Citri A, Harari D, Shohat G et al (2006) Hsp90 recognizes a common surface on client kinases. J Biol Chem 281:14361–14369
Clarke AR (1996) Molecular chaperones in protein folding and translocation. Curr Opin Struct Biol 6:43–50
Coitinho AS, Lopes MH, Hajj GNM et al (2007) Short-term memory formation and long-term memory consolidation are enhanced by cellular prion association to stress-inducible protein 1. Neurobiol Dis 26:282–290
da Fonseca ACC, Romão L, Amaral RF et al (2012) Microglial stress inducible protein 1 promotes proliferation and migration in human glioblastoma cells. Neuroscience 200:130–141
Daniel S, Bradley G, Longshaw VM et al (2008) Nuclear translocation of the phosphoprotein Hop (Hsp70/Hsp90 organizing protein) occurs under heat shock, and its proposed nuclear localization signal is involved in Hsp90 binding. Biochim Biophys Acta 1783:1003–1014
Daugaard M, Jäättelä M, Rohde M (2005) Hsp70-2 is required for tumor cell growth and survival. Cell Cycle 4:877–880
de Souza LER, Moura Costa MD, Bilek ES et al (2014) STI1 antagonizes cytoskeleton collapse mediated by small GTPase Rnd1 and regulates neurite growth. Exp Cell Res 324:84–91
Demand J, Lüders J, Höhfeld J (1998) The carboxy-terminal domain of Hsc70 provides binding sites for a distinct set of chaperone cofactors. Mol Cell Biol 18:2023–2028
DeZwaan DC, Freeman BC (2008) HSP90: the Rosetta stone for cellular protein dynamics? Cell Cycle 7:1006–1012
Dittmar KD, Hutchison KA, Owens-Grillo JK et al (1996) Reconstitution of the steroid receptor hsp90 heterocomplex assembly system of rabbit reticulocyte lysate. J Biol Chem 271:12833–12839
Ellis J (1988) Proteins as molecular chaperones. Nature 328:378–379
Erlich RB, Kahn SA, Lima FRS et al (2007) STI1 promotes glioma proliferation through MAPK and PI3K pathways. Glia 55:1690–1698
Flom G, Weekes J, Williams JJ et al (2006) Effect of mutation of the tetratricopeptide repeat and asparatate-proline 2 domains of Sti1 on Hsp90 signaling and interaction in Saccharomyces cerevisiae. Genetics 172:41–51
Francis LK, Alsayed Y, Leleu X et al (2006) Combination mammalian target of rapamycin inhibitor rapamycin and HSP90 inhibitor 17-allylamino-17-demethoxygeldanamycin has synergistic activity in multiple myeloma. Clin Cancer Res 12:6826–6835
Gaiser AM, Brandt F, Richter K (2009) The non-canonical Hop protein from Caenorhabditis elegans exerts essential functions and forms binary complexes with either Hsc70 or Hsp90. J Mol Biol 391:621–634
Gitau GW, Mandal P, Blatch GL et al (2012) Characterisation of the Plasmodium falciparum Hsp70-Hsp90 organising protein (PfHop). Cell Stress Chaperones 17:191–202
Graf C, Stankiewicz M, Kramer G et al (2009) Spatially and kinetically resolved changes in the conformational dynamics of the Hsp90 chaperone machine. EMBO J 28:602–613
Grigus S, Burnett B, Margot N et al (1998) Drosophila homolog of Hsp70/Hsp90 Organizing Protein. GenBank accession number AF056198.1. NCBI. http://www.ncbi.nlm.nih.gov/nuccore/AF056198.1. Cited 17 Jan 2014
Hajj GNM, Arantes CP, Dias MVS et al (2013) The unconventional secretion of stress-inducible protein 1 by a heterogeneous population of extracellular vesicles. Cell Mol Life Sci 70:3211–3227
Hartl FU (1996) Molecular chaperones in cellular protein folding. Nature 381:571–580
Hartl FU, Bracher A, Hayer-Hartl M (2011) Molecular chaperones in protein folding and proteostasis. Nature 475:324–332
Hendrick JP, Hartl FU (1995) The role of molecular chaperones in protein folding. FASEB J 9:1559–1569
Hessling M, Richter K, Buchner J (2009) Dissection of the ATP-induced conformational cycle of the molecular chaperone Hsp90. Nat Struct Mol Biol 16:287–293
Hildenbrand ZL, Molugu SK, Paul A et al (2010) High-yield expression and purification of the Hsp90-associated p23, FKBP52, HOP and SGTα proteins. J Chromatogr B Analyt Technol Biomed Life Sci 878:2760–2764
Hombach A, Ommen G, Chrobak M et al (2013) The Hsp90-Sti1 interaction is critical for Leishmania donovani proliferation in both life cycle stages. Cell Microbiol 15:585–600
Honore B, Leffers H, Madsen P et al (1992) Molecular cloning and expression of a transformation-sensitive human protein containing the TPR motif and sharing identity to the stress-inducible yeast protein STI1. J Biol Chem 267:8485–8491
Horibe T, Kohno M, Haramoto M et al (2011) Designed hybrid TPR peptide targeting Hsp90 as a novel anticancer agent. J Transl Med 9:8
Horibe T, Torisawa A, Kohno M et al (2012) Molecular mechanism of cytotoxicity induced by Hsp90-targeted Antp-TPR hybrid peptide in glioblastoma cells. Mol Cancer 11:59
Jakob U, Scheibel T, Bose S et al (1996) Assessment of the ATP binding properties of Hsp90. J Biol Chem 271:10035–10041
Jego G, Hazoumé A, Seigneuric R et al (2013) Targeting heat shock proteins in cancer. Cancer Lett 332:275–285
Johnson JL, Brown C (2009) Plasticity of the Hsp90 chaperone machine in divergent eukaryotic organisms. Cell Stress Chaperones 14:83–94
Johnson BD, Schumacher RJ, Ross ED et al (1998) Hop modulates Hsp70/Hsp90 interactions in protein folding. J Biol Chem 273:3679–3686
Joo J, Dorsey F, Joshi A et al (2011) Hsp90-Cdc37 chaperone complex regulates Ulk1- and Atg13-mediated mitophagy. Mol Cell 43:572–585
Joshi M, Dwyer DM, Nakhasi HL (1993) Cloning and characterization of differentially expressed genes from in vitro-grown ‘amastigotes’ of Leishmania donovani. Mol Biochem Parasitol 58:345–354
Kamal A, Boehm MF, Burrows FJ (2004) Therapeutic and diagnostic implications of Hsp90 activation. Trends Mol Med 10:283–290
Kampinga HH (2006) Chaperones in preventing protein denaturation in living cells and protecting against cellular stress. Handb Exp Pharmacol 172:1–42
Kimmins S, MacRae TH (2000) Maturation of steroid receptors: an example of functional cooperation among molecular chaperones and their associated proteins. Cell Stress Chaperones 5:76–86
Klein SL, Strausberg RL, Wagner L et al (2002) Genetic and genomic tools for Xenopus research: the NIH xenopus initiative. Dev Dyn 225:384–391
Kubota H, Yamamoto S, Itoh E et al (2010) Increased expression of co-chaperone HOP with HSP90 and HSC70 and complex formation in human colonic carcinoma. Cell Stress Chaperones 15:1003–1011
Lanneau D, Brunet M, Frisan E et al (2008) Heat shock proteins: essential proteins for apoptosis regulation: apoptosis review series. J Cell Mol Med 12:743–761
Lee P, Shabbir A, Cardozo C et al (2004) Sti1 and Cdc37 can Stabilize Hsp90 in chaperone complexes with a protein kinase. Mol Biol Cell 15:1785–1792
Lee CT, Graf C, Mayer FJ et al (2012) Dynamics of the regulation of Hsp90 by the co-chaperone Sti1. EMBO J 31:1518–1528
Li J, Soroka J, Buchner J (2012a) The Hsp90 chaperone machinery: conformational dynamics and regulation by co-chaperones. Biochim Biophys Acta 1823:624–635
Li J, Sun X, Wang Z et al (2012b) Regulation of vascular endothelial cell polarization and migration by Hsp70/Hsp90-organizing protein. PLoS One 7:e36389
Lima FRS, Arantes CP, Muras AG et al (2007) Cellular prion protein expression in astrocytes modulates neuronal survival and differentiation. J Neurochem 103:2164–2176
Longshaw VM, Chapple JP, Balda MS et al (2004) Nuclear translocation of the Hsp70/Hsp90 organizing protein mSTI1 is regulated by cell cycle kinases. J Cell Sci 117:701–710
Longshaw VM, Baxter M, Prewitz M et al (2009) Knockdown of the co-chaperone Hop promotes extranuclear accumulation of Stat3 in mouse embryonic stem cells. Eur J Cell Biol 88:153–166
Lopes MH, Santos TG (2012) Prion potency in stem cells biology. Prion 6:142–146
Lopes MH, Hajj GNM, Muras AG et al (2005) Interaction of cellular prion and stress-inducible protein 1 promotes neuritogenesis and neuroprotection by distinct signaling pathways. J Neurosci 25:11330–11339
Maciejewski A, Prado MA, Choy WY (2013) 1H, 15N and 13C backbone resonance assignments of the TPR1 and TPR2A domains of mouse STI1. Biomol NMR Assign 7:305–310
Mahalingam D, Swords R, Carew JS et al (2009) Targeting HSP90 for cancer therapy. Br J Cancer 100:1523–1529
Marozkina NV, Yemen S, Borowitz M et al (2010) Hsp 70/Hsp 90 organizing protein as a nitrosylation target in cystic fibrosis therapy. Proc Natl Acad Sci U S A 107:11393–11398
Martin J (2004) Chaperonin function—effects of crowding and confinement. J Mol Recognit 17:465–472
McLaughlin SH, Ventouras LA, Lobbezoo B et al (2004) Independent ATPase activity of Hsp90 subunits creates a flexible assembly platform. J Mol Biol 344:813–826
Miyata Y, Nakamoto H, Neckers L (2013) The therapeutic target Hsp90 and cancer hallmarks. Curr Pharm Des 19:347–365
Morales MA, Watanabe R, Dacher M et al (2010) Phosphoproteome dynamics reveal heat-shock protein complexes specific to the Leishmania donovani infectious stage. Proc Natl Acad Sci U S A 107:8381–8386
Mosser DD, Morimoto RI (2004) Molecular chaperones and the stress of oncogenesis. Oncogene 23:2907–2918
Müller L, Schaupp A, Walerych D et al (2004) Hsp90 regulates the activity of wild type p53 under physiological and elevated temperatures. J Biol Chem 279:48846–48854
Muller P, Ruckova E, Halada P et al (2013) C-terminal phosphorylation of Hsp70 and Hsp90 regulates alternate binding to co-chaperones CHIP and HOP to determine cellular protein folding/degradation balances. Oncogene 32:3101–3110
Nadeau K, Das A, Walsh CT (1993) Hsp90 chaperonins possess ATPase activity and bind heat shock transcription factors and peptidyl prolyl isomerases. J Biol Chem 268:1479–1487
Neckers L (2007) Heat shock protein 90: the cancer chaperone. J Biosci 32:517–530
Nelson GM, Huffman H, Smith DF (2003) Comparison of the carboxy-terminal DP-repeat region in the co-chaperones Hop and Hip. Cell Stress Chaperones 8:125–133
Nicolet CM, Craig EA (1989) Isolation and characterization of STI1, a stress-inducible gene from Saccharomyces cerevisiae. Mol Cell Biol 9:3638–3646
Obermann WMJ, Sondermann H, Russo AA et al (1998) In vivo function of Hsp90 is dependent on ATP binding and ATP hydrolysis. J Cell Biol 143:901–910
Odunuga OO, Hornby JA, Bies C et al (2003) Tetratricopeptide repeat motif-mediated Hsc70-mSTI1 interaction. Molecular characterization of the critical contacts for successful binding and specificity. J Biol Chem 278:6896–6904
Odunuga OO, Longshaw VM, Blatch GL (2004) Hop: more than an Hsp70/Hsp90 adaptor protein. Bioessays 26:1058–1068
Onuoha SC, Coulstock ET, Grossmann JG et al (2008) Structural studies on the co-chaperone Hop and its complexes with Hsp90. J Mol Biol 379:732–744
Ostapchenko VG, Beraldo FH, Mohammad AH et al (2013) The prion protein ligand, stress-inducible phosphoprotein 1, regulates amyloid-β oligomer toxicity. J Neurosci 33:16552–16564
Panaretou B, Prodromou C, Roe SM et al (1998) ATP binding and hydrolysis are essential to the function of the Hsp90 molecular chaperone in vivo. EMBO J 17:4829–4836
Park JW, Yeh MW, Wong MG et al (2003) The heat shock protein 90-binding geldanamycin inhibits cancer cell proliferation, down-regulates oncoproteins, and inhibits epidermal growth factor-induced invasion in thyroid cancer cell lines. J Clin Endocrinol Metab 88:3346–3353
Picard D (2002) Heat-shock protein 90, a chaperone for folding and regulation. Cell Mol Life Sci 59:1640–1648
Pimienta G, Herbert KM, Regan L (2011) A compound that inhibits the HOP-Hsp90 complex formation and has unique killing effects in breast cancer cell lines. Mol Pharm 8:2252–2261
Pratt WB, Toft DO (2003) Regulation of signaling protein function and trafficking by the hsp90/hsp70-based chaperone machinery. Exp Biol Med 228:111–133
Prinsloo E, Setati MM, Longshaw VM et al (2009) Chaperoning stem cells: a role for heat shock proteins in the modulation of stem cell self-renewal and differentiation? Bioessays 31:370–377
Prinsloo E, Kramer AH, Edkins AL et al (2011) STAT3 interacts directly with Hsp90. IUBMB Life 64:266–273
Prodromou C (2012) The ‘active life’ of Hsp90 complexes. Biochim Biophys Acta—Mol Cell Res 1823:614–623
Prodromou C, Panaretou B, Chohan S et al (2000) The ATPase cycle of Hsp90 drives a molecular ‘clamp’ via transient dimerization of the N-terminal domains. EMBO J 19:4383–4392
Qing G, Yan P, Xiao G (2006) Hsp90 inhibition results in autophagy-mediated proteasome-independent degradation of IκB kinase (IKK). Cell Res 16:895–901
Reikvam H, Ersvær E, Bruserud Ø (2009) Heat shock protein 90–a potential target in the treatment of human acute myelogenous leukemia. Curr Cancer Drug Targets 9:761–776
Richter K, Muschler P, Hainzl O et al (2003) Sti1 is a non-competitive inhibitor of the Hsp90 ATPase. Binding prevents the N-terminal dimerization reaction during the ATPase cycle. J Biol Chem 278:10328–10333
Richter K, Soroka J, Skalniak L et al (2008) Conserved conformational changes in the ATPase cycle of human Hsp90. J Biol Chem 283:17757–17765
Roffé M, Beraldo FH, Bester R et al (2010) Prion protein interaction with stress-inducible protein 1 enhances neuronal protein synthesis via mTOR. Proc Natl Acad Sci U S A 107:13147–13152
Ruckova E, Muller P, Nenutil R et al (2012) Alterations of the Hsp70/Hsp90 chaperone and the HOP/CHIP co-chaperone system in cancer. Cell Mol Biol Lett 17:446–458
Samali A, Cotter TG (1996) Heat shock proteins increase resistance to apoptosis. Exp Cell Res 223:163–170
Santos TG, Silva IR, Costa-Silva B et al (2011) Enhanced neural progenitor/stem cells self-renewal via the interaction of stress-inducible protein 1 with the prion protein. Stem Cells 29:1126–1136
Santos TG, Beraldo FH, Hajj GNM et al (2013) Laminin-γ1 chain and stress inducible protein 1 synergistically mediate PrPC-dependent axonal growth via Ca2+ mobilization in dorsal root ganglia neurons. J Neurochem 124:210–223
Scheibel T, Neuhofen S, Weikl T et al (1997) ATP-binding properties of human Hsp90. J Biol Chem 272:18608–18613
Scheufler C, Brinker A, Bourenkov G et al (2000) Structure of TPR domain-peptide complexes: critical elements in the assembly of the Hsp70-Hsp90 multichaperone machine. Cell 101:199–210
Schmid AB, Lagleder S, Gräwert MA et al (2012) The architecture of functional modules in the Hsp90 co-chaperone Sti1/Hop. EMBO J 31:1506–1517
Setati MM, Prinsloo E, Longshaw VM et al (2010) Leukemia inhibitory factor promotes Hsp90 association with STAT3 in mouse embryonic stem cells. IUBMB Life 62:61–66
Sims JD, McCready J, Jay DG (2011) Extracellular heat shock protein (Hsp)70 and Hsp90α assist in matrix metalloproteinase-2 activation and breast cancer cell migration and invasion. PLoS One 6:e18848
Skalnikova H, Martinkova J, Hrabakova R et al (2011) Cancer drug-resistance and a look at specific proteins: Rho GDP-dissociation inhibitor 2, Y-box binding protein 1, and HSP70/90 organizing protein in proteomics clinical application. J Proteome Res 10:404–415
Smith DF, Sullivan WP, Marion TN et al (1993) Identification of a 60-kilodalton stress-related protein, p60, which interacts with hsp90 and hsp70. Mol Cell Biol 13:869–76.
Soares IN, Caetano FA, Pinder J et al (2013) Regulation of stress-inducible phosphoprotein 1 nuclear retention by protein inhibitor of activated STAT PIAS1. Mol Cell Proteomics 12:3253–3270
Song Y, Masison DC (2005) Independent regulation of Hsp70 and Hsp90 chaperones by Hsp70/Hsp90-organizing protein Sti1 (Hop1). J Biol Chem 280:34178–34185
Song HO, Lee W, An K et al (2009) C. elegans STI-1, the Homolog of Sti1/Hop, is involved in aging and stress response. J Mol Biol 390:604–617
Soti C, Csermely P (1998) Molecular chaperones in the etiology and therapy of cancer. Pathol Oncol Res 4:316–321
Stepanova L, Finegold M, DeMayo F et al (2000) The oncoprotein kinase chaperone CDC37 functions as an oncogene in mice and collaborates with both c-myc and cyclin D1 in transformation of multiple tissues. Mol Cell Biol 20:4462–4473
Sun W, Xing B, Sun Y et al (2007) Proteome analysis of hepatocellular carcinoma by two-dimensional difference gel electrophoresis. Mol Cell Proteomics 6:1798–1808
Taipale M, Jarosz DF, Lindquist S (2010) HSP90 at the hub of protein homeostasis: emerging mechanistic insights. Nat Rev Mol Cell Biol 11:515–528
Tan SS, Ahmad I, Bennett HL et al (2011) GRP78 up-regulation is associated with androgen receptor status, Hsp70-Hsp90 client proteins and castrate-resistant prostate cancer. J Pathol 223:81–87
Tastan Bishop O, Edkins AL, Blatch GL (2014) Sequence and domain conservation of the coelacanth Hsp40 and Hsp90 chaperones suggests conservation of function. J Exp Zool B Mol Dev Evol. 322:359–378
Trepel J, Mollapour M, Giaccone G et al (2010) Targeting the dynamic HSP90 complex in cancer. Nat Rev Cancer 10:537–549
Tsai CL, Tsai CN, Lin CY et al (2012) Secreted Stress-Induced Phosphoprotein 1 Activates the ALK2-SMAD signaling pathways and promotes cell proliferation of ovarian cancer cells. Cell Rep 2:283–293
Tsen F, Bhatia A, O’Brien K et al (2013) Extracellular heat shock protein 90 signals through subdomain II and the NPVY motif of LRP-1 receptor to Akt1 and Akt2: a circuit essential for promoting skin cell migration in vitro and wound healing in vivo. Mol Cell Biol 33:4947–4959
Tytell M, Hooper PL (2001) Heat shock proteins: new keys to the development of cytoprotective therapies. Expert Opin Ther Targets 5:267–287
van der Spuy J, Kana BD, Dirr HW et al (2000) Heat shock cognate protein 70 chaperone-binding site in the co-chaperone murine stress-inducible protein 1 maps to within three consecutive tetratricopeptide repeat motifs. Biochem J 345:645–651
Walsh N, O’Donovan N, Kennedy S et al (2009) Identification of pancreatic cancer invasion-related proteins by proteomic analysis. Proteome Sci 7:3
Walsh N, Larkin A, Swan N et al (2011) RNAi knockdown of Hop (Hsp70/Hsp90 organising protein) decreases invasion via MMP-2 down regulation. Cancer Lett 306:180–189
Wandinger SK, Richter K, Buchner J (2008) The Hsp90 chaperone machinery. J Biol Chem 283:18473–18477
Wang TH, Chao A, Tsai CL et al (2010) Stress-induced phosphoprotein 1 as a secreted biomarker for human ovarian cancer promotes cancer cell proliferation. Mol Cell Proteomics 9:1873–1884
Webb JR, Campos-Neto A, Skeiky YAW et al (1997) Molecular characterization of the heat-inducible LmSTI1 protein of Leishmania major. Mol Biochem Parasitol 89:179–193
Wegele H, Müller L, Buchner J (2004) Hsp70 and Hsp90-a relay team for protein folding. Rev Physiol Biochem Pharmacol 151:1–44
Wegele H, Wandinger SK, Schmid AB et al (2006) Substrate transfer from the chaperone Hsp70 to Hsp90. J Mol Biol 356:802–811
Welch WJ (1991) The role of heat-shock proteins as molecular chaperones. Curr Opin Cell Biol 3:1033–1038
Whitelaw ML, Hutchison K, Perdew GH (1991) A 50-kDa cytosolic protein complexed with the 90-kDa heat shock protein (hsp90) is the same protein complexed with pp60v-src hsp90 in cells transformed by the rous sarcoma virus. J Biol Chem 266:16436–16440
Whitesell L, Lindquist SL (2005) HSP90 and the chaperoning of cancer. Nat Rev Cancer 5:761–772
Willmer T, Contu L, Blatch GL et al (2013) Knockdown of Hop downregulates RhoC expression, and decreases pseudopodia formation and migration in cancer cell lines. Cancer Lett 328:252–260
Wolfe KJ, Rena HY, Trepte P et al (2013) The Hsp70/90 cochaperone, Sti1, suppresses proteotoxicity by regulating spatial quality control of amyloid-like proteins. Mol Biol Cell 24:3588–3602
Woods IG, Wilson C, Friedlander B et al (2005) The zebrafish gene map defines ancestral vertebrate chromosomes. Genome Res 15:1307–1314
Xu C, Liu J, Hsu LC et al (2011) Functional interaction of Heat Shock protein 90 and beclin 1 modulates toll-like receptor-mediated autophagy. FASEB J 25:2700–2710
Yamamoto S, Subedi GP, Hanashima S et al (2014) ATPase Activity and ATP-dependent conformational change in the co-chaperone HSP70/HSP90-organizing protein (HOP). J Biol Chem 289:9880–9886
Yi F, Regan L (2008) A novel class of small molecule inhibitors of Hsp90. ACS Chem Biol 3:645–654
Zanata SM, Lopes MH, Mercadante AF et al (2002) Stress-inducible protein 1 is a cell surface ligand for cellular prion that triggers neuroprotection. EMBO J 21:3307–3316
Zhang Z, Quick MK, Kanelakis KC et al (2003) Characterization of a plant homolog of hop, a cochaperone of hsp90. Plant Physiol 131:525–535
Acknowledgments
SB-H was supported to conduct this research under the Australian Commonwealth Collaborative Research Network (CRN) funding to Victoria University. ALE and GLB were supported by grants from the National Research Foundation (NRF) South Africa and the Cancer Research Initiative of South Africa (CARISA). ALE was also supported by grants from the Medical Research Council (MRC) South Africa and Cancer Association of South Africa (CANSA).
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Baindur-Hudson, S., Edkins, A., Blatch, G. (2015). Hsp70/Hsp90 Organising Protein (Hop): Beyond Interactions with Chaperones and Prion Proteins. In: Blatch, G., Edkins, A. (eds) The Networking of Chaperones by Co-chaperones. Subcellular Biochemistry, vol 78. Springer, Cham. https://doi.org/10.1007/978-3-319-11731-7_3
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