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Lipidomics analysis of outer membrane vesicles and elucidation of the ceramide phosphoinositol biosynthetic pathway in Bacteroides thetaiotaomicron

ABSTRACT: In this work, we characterized the lipid composition of membranes and OMV from Bacteroides thetaiotaomicron VPI-5482. LC-MS analysis indicate that OMV carry sphingolipids, glycerophospholipids and serine-dipeptide lipids. Sphingolipid species represent more than 50% of the total lipid content of OMV. The most abundant sphingolipids in OMV are ceramide phosphoethanolamine (CerPE) and ceramide phosphoinositol (CerPI). Bioinformatic analysis allowed the identification of the BT1522-1526 operon putatively involved in CerPI synthesis. Mutagenesis studies revealed BT1522-1526 are essential for synthesis of PI and CerPI, confirming the role of this operon in biosynthesis of CerPI. BT1522-1526 mutant strains lacking CerPI produced OMV that were indistinguishable from the wild-type strain, indicating that CerPI sphingolipid species are not involved in OMV biogenesis. Bacteroides sphingolipids are thought to modulate host-commensal interactions, and based on our data, we propose that OMV could act as long distance delivery vehicles for these molecules.

ORGANISM(S): Bacteroides Thetaiotaomicron

TISSUE(S): Bacterial Cells

SUBMITTER: Mariana Sartorio

PROVIDER: ST001904 | MetabolomicsWorkbench | Tue Jun 22 00:00:00 BST 2021

REPOSITORIES: MetabolomicsWorkbench

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