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Intermembrane transport: Glycerophospholipid homeostasis of the Gram-negative cell envelope.


ABSTRACT: This perspective addresses recent advances in lipid transport across the Gram-negative inner and outer membranes. While we include a summary of previously existing literature regarding this topic, we focus on the maintenance of lipid asymmetry (Mla) pathway. Discovered in 2009 by the Silhavy group [J. C. Malinverni, T. J. Silhavy, Proc. Natl. Acad. Sci. U.S.A. 106, 8009-8014 (2009)], Mla has become increasingly appreciated for its role in bacterial cell envelope physiology. Through the work of many, we have gained an increasingly mechanistic understanding of the function of Mla via genetic, biochemical, and structural methods. Despite this, there is a degree of controversy surrounding the directionality in which Mla transports lipids. While the initial discovery and subsequent studies have posited that it mediated retrograde lipid transport (removing glycerophospholipids from the outer membrane and returning them to the inner membrane), others have asserted the opposite. This Perspective aims to lay out the evidence in an unbiased, yet critical, manner for Mla-mediated transport in addition to postulation of mechanisms for anterograde lipid transport from the inner to outer membranes.

SUBMITTER: Powers MJ 

PROVIDER: S-EPMC6717313 | biostudies-literature | 2019 Aug

REPOSITORIES: biostudies-literature

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Intermembrane transport: Glycerophospholipid homeostasis of the Gram-negative cell envelope.

Powers Matthew J MJ   Trent M Stephen MS  

Proceedings of the National Academy of Sciences of the United States of America 20190816 35


This perspective addresses recent advances in lipid transport across the Gram-negative inner and outer membranes. While we include a summary of previously existing literature regarding this topic, we focus on the maintenance of lipid asymmetry (Mla) pathway. Discovered in 2009 by the Silhavy group [J. C. Malinverni, T. J. Silhavy, <i>Proc. Natl. Acad. Sci. U.S.A.</i> 106, 8009-8014 (2009)], Mla has become increasingly appreciated for its role in bacterial cell envelope physiology. Through the wo  ...[more]

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