14-3-3 scaffold proteins mediate the inactivation of trim25 and inhibition of the type I interferon response by herpesvirus deconjugases

Autoři: Soham Gupta aff001;  Päivi Ylä-Anttila aff001;  Tatyana Sandalova aff002;  Renhua Sun aff002;  Adnane Achour aff002;  Maria G. Masucci aff001
Působiště autorů: Department of Cell and Molecular Biology, Karolinska Institutet, Stockholm, Sweden aff001;  Science for Life Laboratory, Campus Solna, Stockholm, Sweden aff002;  Department of Medicine, Karolinska Institute, Stockholm, Sweden aff003;  Division of Infectious Diseases, Karolinska University Hospital, Stockholm, Sweden aff004
Vyšlo v časopise: 14-3-3 scaffold proteins mediate the inactivation of trim25 and inhibition of the type I interferon response by herpesvirus deconjugases. PLoS Pathog 15(11): e1008146. doi:10.1371/journal.ppat.1008146
Kategorie: Research Article
prolekare.web.journal.doi_sk: 10.1371/journal.ppat.1008146


The 14-3-3 molecular scaffolds promote type I interferon (IFN) responses by stabilizing the interaction of RIG-I with the TRIM25 ligase. Viruses have evolved unique strategies to halt this cellular response to support their replication and spread. Here, we report that the ubiquitin deconjugase encoded in the N-terminus of the Epstein-Barr virus (EBV) large tegument protein BPLF1 harnesses 14-3-3 molecules to promote TRIM25 autoubiquitination and sequestration of the ligase into inactive protein aggregates. Catalytically inactive BPLF1 induced K48-linked autoubiquitination and degradation of TRIM25 while the ligase was mono- or di-ubiquitinated in the presence of the active viral enzyme and formed cytosolic aggregates decorated by the autophagy receptor p62/SQSTM1. Aggregate formation and the inhibition of IFN response were abolished by mutations of solvent exposed residues in helix-2 of BPLF1 that prevented binding to 14-3-3 while preserving both catalytic activity and binding to TRIM25. 14-3-3 interacted with the Coiled-Coil (CC) domain of TRIM25 in in vitro pulldown, while BPLF1 interacted with both the CC and B-box domains, suggesting that 14-3-3 positions BPLF1 at the ends of the CC dimer, close to known autoubiquitination sites. Our findings provide a molecular understanding of the mechanism by which a viral deubiquitinase inhibits the IFN response and emphasize the role of 14-3-3 proteins in modulating antiviral defenses.

Klíčová slova:

Crystal structure – Transfection – Immunoprecipitation – HeLa cells – Ubiquitination – Dimers – Ligases


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