Mycobacterium Tuberculosis Modulates Its Cell Surface Via an Oligopeptide Permease (Opp) Transport System

Overview

Journal FASEB J

Specialties Biology
Physiology

Date 2009 Aug 13

PMID 19671666

Citations 27

Authors

Mario Alberto Flores-Valdez

Rowan P Morris

Francoise Laval

Mamadou Daffe

Gary K Schoolnik

Affiliations

Soon will be listed here.

Abstract

Bacterial species utilize a vast repertoire of surface structures to interact with their surroundings and employ a number of strategies to reconfigure the cellular envelope according to specific stimuli. Gram-positive bacteria, exemplified by Streptomyces and Bacillus species, control production of some exposed molecules by importing oligopeptide signals via permeases (Opp). Such oligopeptides modulate intracellular signaling pathways. In this work, we functionally characterized an Opp of the human pathogen Mycobacterium tuberculosis (Mtb) and propose its reannotation. Using genome-wide transcriptional profiling, we found that Opp was required to modulate (fold-change ranging from -3.5 to 2.0) the expression of several genes, most of them encoding surface-exposed molecules. These included the virulence-associated lipids mycolic acids and phthiocerol dimycocerosates (PDIMs) as well as PE-family proteins. By thin-layer chromatography and MALDI-TOF-MS we confirmed changes in the lipid profile, including an altered accumulation of triacylglycerides and an affected ratio of mycolic acids to PDIMs. An Opp loss of function mutant showed no in vitro growth defect, but had diminished burden during chronic infection and produced a slightly delayed time to death of animals when compared to WT Mtb infection.

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