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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Lipoprotein SmpA is a component of the YaeT complex that assembles outer membrane proteins in Escherichia coli
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Lipoprotein SmpA is a component of the YaeT complex that assembles outer membrane proteins in Escherichia coli

机译:脂蛋白SmpA是YaeT复合物的组成部分,该复合物在大肠杆菌中组装外膜蛋白

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摘要

A major role of the outer membrane (OM) of Gram-negative bacteria is to provide a protective permeability barrier for the cell, and proper maintenance of the OM is required for cellular viability. OM biogenesis requires the coordinated assembly of constituent lipids and proteins via dedicated OM assembly machineries. We have previously shown that, in Escherichia coli, the multicomponent YaeT complex is responsible for the assembly of OM β-barrel proteins (OMPs). This complex contains the OMP YaeT and three OM lipoproteins. Here, we report another component of the YaeT complex, the OM lipoprotein small protein A (SmpA). Strains carrying loss-of-function mutations in smpA are viable but exhibit defects in OMP assembly. Biochemical experiments show that SmpA is involved in maintaining complex stability. Taken together, these experiments establish an important role for SmpA in both the structure and function of the YaeT complex.
机译:革兰氏阴性细菌的外膜(OM)的主要作用是为细胞提供保护性通透性屏障,并且对OM的适当维护对于细胞活力是必需的。 OM生物发生需要通过专用的OM组装设备协调组成脂质和蛋白质的组装。先前我们已经表明,在大肠杆菌中,多组分YaeT复合物负责OMβ-桶蛋白(OMP)的组装。该复合物包含OMP YaeT和三种OM脂蛋白。在这里,我们报告YaeT复合体的另一个组件,OM脂蛋白小蛋白A(SmpA)。 smpA中带有功能丧失突变的菌株是可行的,但在OMP组装中表现出缺陷。生化实验表明,SmpA参与维持复杂的稳定性。综上所述,这些实验在YaeT复合体的结构和功能中确立了SmpA的重要作用。

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