Cited by 117Cytokine Signaling Pathways and InteractionsUbiquitin and proteasome pathwaysinterferon and immune responses

Simian Virus 5 V Protein Acts as an Adaptor, Linking DDB1 to STAT2, To Facilitate the Ubiquitination of STAT1

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Precious, B., Childs, K., Fitzpatrick-Swallow, V., Goodbourn, S., Randall, R. E.·2005·Journal of Virology

Abstract

The V protein of simian virus 5 (SV5) facilitates the ubiquitination and subsequent proteasome-mediated degradation of STAT1. Here we show, by visualizing direct protein-protein interactions and by using the yeast two-hybrid system, that while the SV5 V protein fails to bind to STAT1 directly, it binds directly and independently to both DDB1 and STAT2, two cellular proteins known to be essential for SV5-mediated degradation of STAT1. We also demonstrate that STAT1 and STAT2 interact independently of SV5 V and show that SV5 V protein acts as an adaptor molecule linking DDB1 to STAT2/STAT1 heterodimers, which in the presence of additional accessory cellular proteins, including Cullin 4a, can ubiquitinate STAT1. Additionally, we show that the avidity of STAT2 for V is relatively weak but is significantly enhanced by the presence of both STAT1 and DDB1, i.e., the complex of STAT1, STAT2, DDB1, and SV5 V is more stable than a complex of STAT2 and V. From these studies we propose a dynamic model in which SV5 V acts as a bridge, bringing together a DDB1/Cullin 4a-containing ubiquitin ligase complex and STAT1/STAT2 heterodimers, which leads to the degradation of STAT1. The loss of STAT1 results in a decrease in affinity of binding of STAT2 for V such that STAT2 either dissociates from V or is displaced from V by STAT1/STAT2 complexes, thereby ensuring the cycling of the DDB1 and SV5 V containing E3 complex for continued rounds of STAT1 ubiquitination and degradation.

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Crossref · 10.1128/jvi.79.21.13434-13441.2005

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  • The V protein of simian virus 5 binds the CRL4 adaptor DDB1, bringing STAT2/STAT1 heterodimers into proximity, and degradation of STAT1 diminishes interferon response.

    “The V protein of simian virus 5 (SV5 V) binds the CRL4 adaptor DDB1, bringing in proximity the host STAT2/STAT1 heterodimers.Ubiquitination and further degradation of STAT1 largely diminishes interferon response to viral infection.99,100”

    From Chasing molecular glue degraders: screening approaches (2022) · cites this paper as [99]

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Authors
Precious, B., Childs, K., Fitzpatrick-Swallow, V., Goodbourn, S., & Randall, R. E.
Affiliations
University of London (GB)
Venue
Journal of Virology
Published
2005-11
Volume
79
Issue
21
Pages
13434-13441
ISSN
  • 0022-538X (ISSN-L)
  • 1098-5514
OpenAlex
W2157111385
Cited by
117
References
37
Citations by year
2026: 3 · 2025: 3 · 2023: 5 · 2022: 6 · 2021: 2 · 2020: 2 · 2019: 7 · 2018: 3 · 2017: 7 · 2016: 7 · 2015: 9 · 2014: 5 · 2013: 4 · 2012: 10
FWCI
3.73
Type
journal article
Language
en
Open access
Locations
  • Journal of Virology (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Wellcome Trust
  • University of St Andrews
  • University of Glasgow
  • Biotechnology and Biological Sciences Research Council
Topics
  • Health Sciences › Medicine › Oncology › Cytokine Signaling Pathways and Interactions
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Ubiquitin and proteasome pathways
  • Life Sciences › Immunology and Microbiology › Immunology › interferon and immune responses
Keywords
simian virus 5, V protein, STAT2, DDB1, E3 ubiquitin ligase, protein-protein interaction, proteasomal degradation, adaptor proteins, interferon signaling
MeSH terms
Animals, DNA-Binding Proteins, Protein Binding, Virus Replication, Signal Transduction, Trans-Activators, Viral Structural Proteins, Dimerization, Cullin Proteins, Parainfluenza Virus 5, STAT1 Transcription Factor, STAT2 Transcription Factor

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