A Phosphomimetic-based Mechanism of Dengue Virus to Antagonize Innate Immunity

Overview

Journal Nat Immunol

Date 2016 Mar 22

PMID 26998762

Citations 69

Authors

Ying Kai Chan

Michaela U Gack

Affiliations

Soon will be listed here.

Abstract

14-3-3 proteins regulate biological processes by binding to phosphorylated serine or phosphorylated threonine motifs of cellular proteins. Among the 14-3-3 proteins, 14-3-3ɛ serves a crucial function in antiviral immunity by mediating the cytosol-to-mitochondrial membrane translocation of the pathogen sensor RIG-I. Here we found that the NS3 protein of dengue virus (DV) bound to 14-3-3ɛ and prevented translocation of RIG-I to the adaptor MAVS and thereby blocked antiviral signaling. Intriguingly, a highly conserved phosphomimetic RxEP motif in NS3 was essential for the binding of 14-3-3ɛ. A recombinant mutant DV deficient in binding to 14-3-3ɛ showed impairment in antagonism of RIG-I and elicited a markedly augmented innate immune response and enhanced T cell activation. Our work reveals a novel phosphomimetic-based mechanism for viral antagonism of 14-3-3-mediated immunity, which might guide the rational design of therapeutics.

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