Analysis of the molecular mechanism of the type III secretion system from enteropathogenic E. coli
Abstract
The type III secretion injectisome is a complex nanomachine, that allows bacteria to deliver protein effectors across eukaryotic cellular membranes. In recent years, significant progress has been made in our understanding of its structure, assembly and mode of operation. In the present stage of knowledge, it consists of a basal structure that traverses the bacterial envelope and the peptidoglycan, surmounted by a needle and a filament. The whole structure can act as a hollow conduit, through which all the virulence proteins will be delivered to the cytosol of the host. A key element in the secretion system is a set of chaperones in the bacterial cytosol, the dedicated type III chaperones. Their exact role in the secretion process remains ainigmatic. The main goal of this study is the investigation of the molecular role of the CesAB chaperone from the Enteropathogenic coli (EPEC) during secretion of its substrates, EspA and EspB. In parallel we are characterizing the EscN ATPase of the ...
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