Genome-wide Screen of Mycobacterium Tuberculosis-infected Macrophages Revealed GID/CTLH Complex-mediated Modulation of Bacterial Growth

Overview

Journal Nat Commun

Specialty Biology

Date 2024 Oct 30

PMID 39472457

Authors

Nelson V Simwela

Luana Johnston

Paulina Pavinski Bitar

Eleni Jaecklein

Craig Altier

Christopher M Sassetti

David G Russell

Affiliations

Soon will be listed here.

Abstract

The eukaryotic Glucose Induced Degradation/C-Terminal to LisH (GID/CTLH) complex is a highly conserved E3 ubiquitin ligase involved in a broad range of biological processes. However, a role of this complex in host anti-microbial defenses has not been described. We exploited Mycobacterium tuberculosis (Mtb) induced cytotoxicity in macrophages in a FACS based CRISPR genetic screen to identify host determinants of intracellular Mtb growth restriction. Our screen identified 5 (GID8, YPEL5, WDR26, UBE2H, MAEA) of the 12 predicted members of the GID/CTLH complex as determinants of intracellular growth of both Mtb and Salmonella serovar Typhimurium. We show that the anti-microbial properties of the GID/CTLH complex knockout macrophages are mediated by enhanced GABAergic signaling, activated AMPK, increased autophagic flux and resistance to Mtb induced necrotic cell death. Meanwhile, Mtb isolated from GID/CTLH knockout macrophages are nutritionally starved and oxidatively stressed. Our study identifies the GID/CTLH complex activity as broadly suppressive of host anti-microbial responses against intracellular bacterial infections.

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