Coronin 2A Mediates Actin-dependent De-repression of Inflammatory Response Genes

Overview

Journal Nature

Specialty Science

Date 2011 Feb 19

PMID 21331046

Citations 94

Authors

Wendy Huang

Serena Ghisletti

Kaoru Saijo

Meghal Gandhi

Myriam Aouadi

Greg J Tesz

Dawn X Zhang

Joyee Yao

Michael P Czech

Bruce L Goode

Michael G Rosenfeld

Christopher K Glass

Affiliations

Soon will be listed here.

Abstract

Toll-like receptors (TLRs) function as initiators of inflammation through their ability to sense pathogen-associated molecular patterns and products of tissue damage. Transcriptional activation of many TLR-responsive genes requires an initial de-repression step in which nuclear receptor co-repressor (NCoR) complexes are actively removed from the promoters of target genes to relieve basal repression. Ligand-dependent SUMOylation of liver X receptors (LXRs) has been found to suppress TLR4-induced transcription potently by preventing the NCoR clearance step, but the underlying mechanisms remain enigmatic. Here we provide evidence that coronin 2A (CORO2A), a component of the NCoR complex of previously unknown function, mediates TLR-induced NCoR turnover by a mechanism involving interaction with oligomeric nuclear actin. SUMOylated LXRs block NCoR turnover by binding to a conserved SUMO2/SUMO3-interaction motif in CORO2A and preventing actin recruitment. Intriguingly, the LXR transrepression pathway can itself be inactivated by inflammatory signals that induce calcium/calmodulin-dependent protein kinase IIγ (CaMKIIγ)-dependent phosphorylation of LXRs, leading to their deSUMOylation by the SUMO protease SENP3 and release from CORO2A. These findings uncover a CORO2A-actin-dependent mechanism for the de-repression of inflammatory response genes that can be differentially regulated by phosphorylation and by nuclear receptor signalling pathways that control immunity and homeostasis.

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