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Dissection of pilus tip assembly by the FimD usher monomer

机译:FIMD UIMER单体的Pilus Tip组装解剖

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Type 1 pili are representative of a class of bacterial surface structures assembled by the conserved chaperone/usher pathway and used by uropathogenic Escherichia coli to attach to bladder cells during infection. The outer membrane assembly platform - the usher - is critical for the formation of pili, catalysing the polymerisation of pilus subunits and enabling the secretion of the nascent pilus. Despite extensive structural characterisation of the usher, a number of questions about its mechanism remain, notably its oligomerisation state, and how it orchestrates the ordered assembly of pilus subunits. We demonstrate here that the FimD usher is able to catalyse in vitro pilus assembly effectively in its monomeric form. Furthermore, by establishing the kinetics of usher-catalysed reactions between various pilus subunits, we establish a complete kinetic model of tip fibrillum assembly, able to account for the order of subunits in native type 1 pili. ?2013 Elsevier Ltd. All rights reserved.
机译:类型1 pili代表由保守的伴侣/亚瑟途径组装的一类细菌表面结构,并通过尿羟疗法的大肠杆菌使用以在感染期间附着于膀胱细胞。外膜组装平台 - 迎膜 - 对菌毛形成皮层至关重要,催化菌落亚基的聚合并能够分泌新生菌落。尽管迎来了广泛的结构表征,但关于其机制的许多问题仍然,特别是其寡头化状态,以及它如何协调Pilus亚基的有序组装。我们在此证明,FIMD迎来能够在其单体形式中有效地催化体外菌毛组件。此外,通过建立各种菌落亚基之间的迎膜催化反应的动力学,我们建立了尖端原纤维组件的完整动力学模型,能够考虑天然1型PILI中亚基的顺序。 ?2013年elestvier有限公司保留所有权利。

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