Transport of lipopolysaccharides and phospholipids to the outer membrane.

Transport of lipopolysaccharides and phospholipids to the outer membrane.
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DOI:
10.1016/j.mib.2021.01.006
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发表时间:
2021-04
影响因子:
5.4
通讯作者:
Ruiz N
Ruiz N
中科院分区:
生物学2区
文献类型:
--
作者:
Wilson A;Ruiz N

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细胞必须建立和维持至少一个围绕基本细胞组件并提供结构完整性的膜。革兰氏阴性细菌有一个内膜,它分隔水的细胞质和周质隔间,以及一个外膜,它包围着周质。外膜为不对称双层,内叶为磷脂,外叶为脂多糖。这种结构提供了细胞的完整性,并防止许多有毒化合物进入细胞。构建外膜是具有挑战性的,因为它的脂质成分必须在内膜内合成,穿过周质运输,最终组装成不对称结构。这篇综述重点介绍了我们对跨细胞膜转运脂多糖的膜间多蛋白质机制的主要最新进展。虽然我们对磷脂转运的了解非常有限,但我们也简要介绍了这个主题的最新进展。
Cells must build and maintain at least one membrane that surrounds essential cellular components and provides structural integrity. Gram-negative bacteria possess an inner membrane, which separates the aqueous cytoplasmic and periplasmic compartments, and an outer membrane, which surrounds the periplasm. The outer membrane is an asymmetric bilayer with phospholipids in its inner leaflet and lipopolysaccharides in its outer leaflet. This structure provides cellular integrity and prevents the entry of many toxic compounds into the cell. Constructing the outer membrane is challenging, since its lipid constituents must be synthesized within the inner membrane, transported across the periplasm, and ultimately assembled into an asymmetric structure. This review highlights major recent advances in our understanding of the mechanism and structure of the intermembrane, multi-protein machine that transports lipopolysaccharide across the cell envelope. Although our understanding of phospholipid transport is very limited, we also provide a brief update on this topic.
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