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EMBO J. 2013 Apr 17;32(8):1195-204. doi: 10.1038/emboj.2013.58. Epub 2013 Mar 19.

Structure of a bacterial type IV secretion core complex at subnanometre resolution.

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  • 1Department of Biological Sciences, Institute of Structural and Molecular Biology, UCL and Birkbeck, London WC1E 7HX, UK.

Abstract

Type IV secretion (T4S) systems are able to transport DNAs and/or proteins through the membranes of bacteria. They form large multiprotein complexes consisting of 12 proteins termed VirB1-11 and VirD4. VirB7, 9 and 10 assemble into a 1.07 MegaDalton membrane-spanning core complex (CC), around which all other components assemble. This complex is made of two parts, the O-layer inserted in the outer membrane and the I-layer inserted in the inner membrane. While the structure of the O-layer has been solved by X-ray crystallography, there is no detailed structural information on the I-layer. Using high-resolution cryo-electron microscopy and molecular modelling combined with biochemical approaches, we determined the I-layer structure and located its various components in the electron density. Our results provide new structural insights on the CC, from which the essential features of T4S system mechanisms can be derived.

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