Outer Membrane Biogenesis.

Outer Membrane Biogenesis.
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外膜生物发生。

DOI:
10.1146/annurev-micro-090816-093754
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发表时间:
2017-09-08
影响因子:
10.5
通讯作者:
Silhavy TJ
Silhavy TJ
中科院分区:
生物学1区
文献类型:
--
作者:
Konovalova A;Kahne DE;Silhavy TJ

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革兰氏阴性菌和细胞器(如线粒体和叶绿体)的标志是存在外膜(OM)。在大肠杆菌等细菌中,OM是一种独特的不对称脂质双层,外小叶中含有脂多糖(LPS)。完整的跨膜蛋白呈现β-桶结构(OMP),并且它们的组装由含有OMP BamA和四种脂蛋白BamB-E的异五聚体BAM复合物催化。Bam复合物如何在没有明显能量来源的情况下将多种OMP组装成膜是一个特别具有挑战性的问题,因为折叠中间体被预测在水性或疏水性环境中是不稳定的。两个模型已经提出,主要是基于结构数据的萌芽模型,以及基于遗传和生化研究的BamA辅助模型。在这里,我们提供了一个关键的讨论的利弊每一个。
The hallmark of Gram-negative bacteria and organelles such as mitochondria and chloroplasts is the presence of an outer membrane (OM). In bacteria such as Escherichia coli, the OM is a unique asymmetric lipid bilayer with lipopolysaccharide (LPS) in the outer leaflet. Integral, transmembrane proteins assume a β-barrel structure (OMPs) and their assembly is catalyzed by the heteropentomeric Bam complex containing the OMP BamA and four lipoproteins, BamB-E. How the Bam complex assembles a great diversity of OMPs into a membrane without an obvious energy source is a particularly challenging problem because folding intermediates are predicted to be unstable in either an aqueous or a hydrophobic environment. Two models have been put forward, the budding model based largely on structural data, and the BamA-assisted model based on genetic and biochemical studies. Here we offer a critical discussion of the pros and cons of each.
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