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ACS Chem Biol. 2012 May 18;7(5):863-70. doi: 10.1021/cb200311s. Epub 2012 Feb 24.

Sulfolipid-1 biosynthesis restricts Mycobacterium tuberculosis growth in human macrophages.

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1
Department of Chemistry, University of California, Berkeley, CA 94720, USA.

Abstract

Mycobacterium tuberculosis (Mtb), the causative agent of tuberculosis, is a highly evolved human pathogen characterized by its formidable cell wall. Many unique lipids and glycolipids from the Mtb cell wall are thought to be virulence factors that mediate host-pathogen interactions. An intriguing example is Sulfolipid-1 (SL-1), a sulfated glycolipid that has been implicated in Mtb pathogenesis, although no direct role for SL-1 in virulence has been established. Previously, we described the biochemical activity of the sulfotransferase Stf0 that initiates SL-1 biosynthesis. Here we show that a stf0-deletion mutant exhibits augmented survival in human but not murine macrophages, suggesting that SL-1 negatively regulates the intracellular growth of Mtb in a species-specific manner. Furthermore, we demonstrate that SL-1 plays a role in mediating the susceptibility of Mtb to a human cationic antimicrobial peptide in vitro, despite being dispensable for maintaining overall cell envelope integrity. Thus, we hypothesize that the species-specific phenotype of the stf0 mutant is reflective of differences in antimycobacterial effector mechanisms of macrophages.

PMID:
22360425
PMCID:
PMC3355658
DOI:
10.1021/cb200311s
[Indexed for MEDLINE]
Free PMC Article

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