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A GMC oxidoreductase homologue is required for acetylation of glycopeptidolipid in Mycobacterium smegmatis.


ABSTRACT: The Mycobacterium tuberculosis Rv3409c gene is required for modulation of the Toll-like receptor 2 (TLR-2) signaling response in infected macrophages. Although each is annotated as encoding a cholesterol oxidase, neither Rv3409c nor its ortholog MSMEG1604 is required for the metabolism of cholesterol in mycobacteria. Here we report that a unique lipid, L1334, accumulates in a MSMEG1604 transposon mutant in the Mycobacterium smegmatis cell envelope. L1334 is a polar glycopeptidolipid that is hyperrhamnosylated and in which the 6-deoxytalose moiety is not acetylated. The alteration of L1334 acetylation is consistent with a reduced level of interference with TLR-2 signaling in mutant infected macrophages.

SUBMITTER: Gao J 

PROVIDER: S-EPMC3985799 | biostudies-literature | 2014 Feb

REPOSITORIES: biostudies-literature

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A GMC oxidoreductase homologue is required for acetylation of glycopeptidolipid in Mycobacterium smegmatis.

Gao Jin J   Sampson Nicole S NS  

Biochemistry 20140124 4


The Mycobacterium tuberculosis Rv3409c gene is required for modulation of the Toll-like receptor 2 (TLR-2) signaling response in infected macrophages. Although each is annotated as encoding a cholesterol oxidase, neither Rv3409c nor its ortholog MSMEG1604 is required for the metabolism of cholesterol in mycobacteria. Here we report that a unique lipid, L1334, accumulates in a MSMEG1604 transposon mutant in the Mycobacterium smegmatis cell envelope. L1334 is a polar glycopeptidolipid that is hype  ...[more]

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