Architecture of the major component of the type III secretion system export apparatus.

Architecture of the major component of the type III secretion system export apparatus.
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DOI:
10.1038/nsmb.2452
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发表时间:
2013-01
影响因子:
16.8
通讯作者:
Lea, Susan M.
Lea, Susan M.
中科院分区:
生物学1区
文献类型:
--
作者:
Abrusci, Patrizia;Vergara-Irigaray, Marta;Johnson, Steven;Beeby, Morgan D.;Hendrixson, David R.;Roversi, Pietro;Friede, Miriam E.;Deane, Janet E.;Jensen, Grant J.;Tang, Christoph M.;Lea, Susan M.

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III型分泌系统(t3ss)是细菌膜包埋分泌的纳米机器,旨在从细菌细胞质中输出特异性靶向蛋白质。通过T3SS的分泌是由称为“出口装置”的内膜蛋白子集控制的。我们发现福氏志贺氏菌出口装置的一个关键成员MxiA在体内组装成一个分泌所必需的环。环形成界面在非鞭毛和鞭毛同源物中都具有很好的保守性,这意味着环在这些系统中是一个进化保守的特征。电子冷冻断层扫描显示一个与t3ss相关的细胞质环,其大小和形状与位于分泌孔和atp酶复合物之间的分泌通道的MxiA环相对应。这定义了出口设备的主要组成部分的分子结构,并允许我们提出控制分泌的分子机制模型。
Type III secretion systems (T3SSs) are bacterial membrane-embedded secretion nanomachines designed to export specifically targeted sets of proteins from the bacterial cytoplasm. Secretion through T3SS is governed by a subset of inner membrane proteins termed the ‘export apparatus’. We show that a key member of the Shigella flexneri export apparatus, MxiA, assembles into a ring essential for secretion in vivo. The ring forming interfaces are well conserved in both non-flagellar and flagellar homologues, implying that the ring is an evolutionary conserved feature in these systems. Electron cryo-tomography reveals a T3SS-associated cytoplasmic torus of size and shape corresponding to the MxiA ring aligned to the secretion channel located between the secretion pore and the ATPase complex. This defines the molecular architecture of the dominant component of the export apparatus and allows us to propose a model for the molecular mechanisms controlling secretion.
DOI: 10.1038/nature09300
发表时间: 2010-08-19
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