Abstract
Posttranslational modifications of targeted substrates alter their cellular fate. Ubiquitin is a highly conserved and ubiquitous covalent modifier protein that tags substrates with a single molecule or with a polyubiquitin chain. Monoubiquitination affects trafficking and signaling patterns of modified proteins. In contrast, polyubiquitination, particularly K48-linked polyubiquitination, targets the protein for degradation by the Ubiquitin-Proteasome System (UPS) resulting in a committed fate through irreversible inactivation of substrate. Given the diversity of cellular functions impacted by ubiquitination, it is no surprise that the wily pathogenic viruses have co-opted the UPS in myriad ways to ensure their survival. In this review, I describe viral exploitation of nondegradative ubiquitin signaling pathways to effect entry, replication, and egress. Additionally, viruses also harness the UPS to degrade antiviral cellular host factors. Finally, I describe how we can exploit the same proteolytic machinery to enable PROTACs (Proteolysis-Targeting Chimeras) to degrade essential viral proteins. Successful implementation of this modality will add to the arsenal of emerging antiviral therapies.
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Abbreviations
- AdV:
-
Adenovirus
- ARIH2:
-
Protein Ariadne-2 homolog
- ART:
-
Arrestin-related trafficking proteins
- bTRCP:
-
Beta-transducin repeat containing
- CARDs:
-
Caspase activation and recruitment domains
- cGAMP:
-
Cyclic guanosine monophosphate–adenosine monophosphate
- cGAS:
-
Cyclic GMP-AMP synthase
- CRBN:
-
Cereblon
- CRL:
-
Cullin-RING ligase
- DDB1:
-
DNA damage-binding protein 1
- DUBs:
-
Deubiquitinases
- EBOV:
-
Ebola virus
- EBV:
-
Epstein barr virus
- ESCRT:
-
Endosomal sorting complex required for transport
- HBV:
-
Hepatitis B virus
- HCMV:
-
Human cytomegalovirus
- HDAC6:
-
Histone deacetylase 6
- HECT:
-
Homologous to E6-AP Carboxyl Terminus
- HEXIM1:
-
Hexamethylene bisacetamide inducible 1
- HIV-1:
-
Human immunodeficiency virus type 1
- HPV:
-
Human papillomavirus
- HRSV:
-
Human respiratory syncytial virus
- HSV-1:
-
Herpes simplex virus 1
- HTLV-1:
-
Human T lymphotropic virus type 1
- IAV:
-
Influenza A virus
- IFN:
-
Interferon
- IMiD:
-
Immunomodulatory
- IRF3:
-
IFN-regulatory factor 3
- ISG15:
-
Interferon stimulated gene 15
- KSHV:
-
Kaposi’s Sarcoma herpes virus
- LUBAC:
-
Linear Ub chain assembly complex
- MAVS:
-
Mitochondrial antiviral signaling protein
- MHC:
-
Major histocompatibility complex
- NEDD4:
-
Neural precursor cell expressed developmentally down-regulated
- PAMPs:
-
Pathogen-associated molecular patterns
- PLPro:
-
Papain-like protease
- PML-NB:
-
Promyelocytic Leukemia Protein-Nuclear Body
- PPIs:
-
Protein:protein interaction interface
- PROTACs:
-
Proteolysis targeting chimeras
- PRR:
-
Pattern recognition receptors
- RBR:
-
RING-between-ring
- RIG-1:
-
Retinoic acid-inducible gene 1
- RING:
-
Really interesting new gene
- RNP:
-
Ribonucleoprotein particle
- RSV:
-
Rous sarcoma virus
- SARS-CoV:
-
Severe acute respiratory syndrome coronavirus
- SARS-CoV-2:
-
Severe acute respiratory syndrome coronavirus 2
- SM:
-
Small molecule
- STAT:
-
Signal transducer and activator of transcription
- STING:
-
Stimulator of interferon genes
- TAK1:
-
TGFb-activated kinase 1
- TBK1:
-
TANK-binding kinase-1
- TNF:
-
Tumor necrosis factor
- TRAF:
-
TNF receptor-associated factor
- TRIM:
-
Tripartite motif
- Ub:
-
Ubiquitin
- UPS:
-
Ubiquitin-proteasome system
- VHL:
-
Von Hippel Lindau
- VIF:
-
Viral infectivity factor
- ZIKV:
-
Zika virus
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Acknowledgments
I would like to thank my colleagues Dane Mohl and Ryan Wurtz for comments and help with the Figs. I apologize to TPD researchers whose work could not be cited due to space limitations.
Declaration of Interests
I am an employee and shareholder of AMGEN.
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Verma, R. (2021). Exploiting Ubiquitin Ligases for Induced Target Degradation as an Antiviral Strategy. In: Liu, X., Zhan, P., Menéndez-Arias, L., Poongavanam, V. (eds) Antiviral Drug Discovery and Development. Advances in Experimental Medicine and Biology, vol 1322. Springer, Singapore. https://doi.org/10.1007/978-981-16-0267-2_13
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