APOBEC3B drives PKR-mediated translation shutdown and protects stress granules in response to viral infection

Lavanya Manjunath, Sunwoo Oh, Pedro Ortega, Alexis Bouin, Elodie Bournique, Ambrocio Sanchez, Pia Møller Martensen, Ashley A. Auerbach, Jordan T. Becker, Marcus Seldin, Reuben S. Harris, Bert L. Semler, Rémi Buisson*

*Corresponding author for this work

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaperJournal articleResearchpeer-review

Abstract

Double-stranded RNA produced during viral replication and transcription activates both protein kinase R (PKR) and ribonuclease L (RNase L), which limits viral gene expression and replication through host shutoff of translation. In this study, we find that APOBEC3B forms a complex with PABPC1 to stimulate PKR and counterbalances the PKR-suppressing activity of ADAR1 in response to infection by many types of viruses. This leads to translational blockage and the formation of stress granules. Furthermore, we show that APOBEC3B localizes to stress granules through the interaction with PABPC1. APOBEC3B facilitates the formation of protein-RNA condensates with stress granule assembly factor (G3BP1) by protecting mRNA associated with stress granules from RNAse L-induced RNA cleavage during viral infection. These results not only reveal that APOBEC3B is a key regulator of different steps of the innate immune response throughout viral infection but also highlight an alternative mechanism by which APOBEC3B can impact virus replication without editing viral genomes.

Original languageEnglish
Article number820
JournalNature Communications
Volume14
Issue1
Number of pages19
ISSN2041-1723
DOIs
Publication statusPublished - Dec 2023

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