Structure and mechanism of the bacterial lipid ABC transporter, MlaFEDB.
Structure and mechanism of the bacterial lipid ABC transporter, MlaFEDB.
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DOI:
10.1016/j.sbi.2022.102429
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发表时间:
2022-10
影响因子:
6.8
通讯作者:
Bhabha G
中科院分区:
文献类型:
--
作者:
Ekiert DC;Coudray N;Bhabha G
The cell envelope of Gram-negative bacteria is composed of an inner membrane, outer membrane and an intervening periplasmic space. How the outer membrane lipids are trafficked and assembled there, and how the asymmetry of the outer membrane is maintained is an area of intense research. The Mla system has been implicated in the Maintenance of Lipid Asymmetry in the outer membrane, and is generally thought to drive the removal of mislocalized phospholipids from the outer membrane and their retrograde transport to the inner membrane. At the heart of the Mla pathway is an structurally unique ABC transporter complex in the inner membrane, called MlaFEDB. Recently, an explosion of cryo-EM studies has begun to shed light on the structure and lipid translocation mechanism of MlaFEDB, with many parallels to other ABC transporter families, including human ABCA and ABCG, as well as bacterial lipopolysaccharide and O-antigen transporters. Here we synthesize information from all available structures, and propose a model for lipid trafficking across the cell envelope by MlaFEDB.
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影响因子:
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