E3 Ligase HECTD3 Promotes RNA Virus Replication and Virus-induced Inflammation Via K33-linked Polyubiquitination of PKR

Overview

Journal Cell Death Dis

Specialties Cell Biology
General Medicine

Date 2023 Jul 4

PMID 37402711

Authors

Jiaying Huang

Zhou Yu

Xuelian Li

Mingjin Yang

Qian Fang

Zheng Li

Chunmei Wang

Taoyong Chen

Xuetao Cao

Affiliations

Soon will be listed here.

Abstract

Uncontrolled viral replication and excessive inflammation are the main causes of death in the host infected with virus. Hence inhibition of intracellular viral replication and production of innate cytokines, which are the key strategies of hosts to fight virus infections, need to be finely tuned to eliminate viruses while avoid harmful inflammation. The E3 ligases in regulating virus replication and subsequent innate cytokines production remain to be fully characterized. Here we report that the deficiency of the E3 ubiquitin-protein ligase HECTD3 results in accelerated RNA virus clearance and reduced inflammatory response both in vitro and in vivo. Mechanistically, HECTD3 interacts with dsRNA-dependent protein kinase R (PKR) and mediates Lys33-linkage of PKR, which is the first non-proteolytic ubiquitin modification for PKR. This process disrupts the dimerization and phosphorylation of PKR and subsequent EIF2α activation, which results in the acceleration of virus replication, but promotes the formation of PKR-IKK complex and subsequent inflammatory response. The finding suggests HECTD3 is the potential therapeutic target for simultaneously restraining RNA virus replication and virus-induced inflammation once pharmacologically inhibited.

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