The TamB ortholog of Borrelia burgdorferi interacts with the β-barrel assembly machine (BAM) complex protein BamA.

The TamB ortholog of Borrelia burgdorferi interacts with the β-barrel assembly machine (BAM) complex protein BamA.
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DOI:
10.1111/mmi.13492
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发表时间:
2016-12
影响因子:
3.6
通讯作者:
Akins DR
Akins DR
中科院分区:
生物学2区
文献类型:
--
作者:
Iqbal H;Kenedy MR;Lybecker M;Akins DR

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二胚层细菌的两个外膜蛋白(OMP)转运系统有助于OMP的组装和输出。这两个系统是β-桶装配机(BAM)复合体和移位和装配模块(TAM)。BAM复合物由OMP组分BamA沿着几种外膜相关蛋白组成。TAM还由称为TamA的OMP和单个内膜(IM)蛋白TamB组成。TamA和TamB一起帮助分泌与毒性相关的OMP。在这项研究中,我们的特点是假设蛋白BB 0794在伯氏疏螺旋体。BB 0794含有一个保守的DUF 490结构域,这是在所有TamB蛋白中发现的基序。所有螺旋体都缺乏TamA直系同源物,但BB 0794的计算和物理化学表征显示它是TamB直系同源物。有趣的是,观察到BB 0794与BamA相互作用,并且BB 0794可调节突变体显示出改变的细胞形态和抗生素敏感性。观察到B. burgdorferi含有TamB直系同源物,其与BamA相互作用并且是适当的外膜生物发生所需的,这不仅鉴定了TamB样蛋白的新作用,而且还可以解释为什么大多数diderms具有TamB样蛋白,而只有选择的组编码TamA。
Two outer membrane protein (OMP) transport systems in diderm bacteria assist in assembly and export of OMPs. These two systems are the β-barrel assembly machine (BAM) complex and the translocation and assembly module (TAM). The BAM complex consists of the OMP component BamA along with several outer membrane associated proteins. The TAM also consists of an OMP, designated TamA, and a single inner membrane (IM) protein, TamB. Together TamA and TamB aid in the secretion of virulence-associated OMPs. In this study we characterized the hypothetical protein BB0794 in Borrelia burgdorferi. BB0794 contains a conserved DUF490 domain, which is a motif found in all TamB proteins. All spirochetes lack a TamA ortholog, but computational and physicochemical characterization of BB0794 revealed it is a TamB ortholog. Interestingly, BB0794 was observed to interact with BamA and a BB0794 regulatable mutant displayed altered cellular morphology and antibiotic sensitivity. The observation that B. burgdorferi contains a TamB ortholog that interacts with BamA and is required for proper outer membrane biogenesis not only identifies a novel role for TamB-like proteins, but also may explain why most diderms harbor a TamB-like protein while only a select group encodes TamA.
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发表时间: 2010-11-10
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