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The Extraordinary Diversity of Bacterial Protein Secretion Mechanisms

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Protein Secretion

Part of the book series: Methods in Molecular Biology ((MIMB,volume 619))

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Abstract

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I have tried to cover the minimal properties of the prolific number of protein secretion systems identified presently, particularly in Gram negative bacteria. New systems, however, are being reported almost by the month and certainly I have missed some. With the accumulating evidence one remains in awe of the complexity of some pathways, with the Type III, IV and VI especially fearsome and impressive. These systems illustrate that protein secretion from bacteria is not only about passage of large polypeptides across a bilayer but also through long tunnels, raising quite different questions concerning mechanisms. The mechanism of transport via the Sec-translocase–translocon is well on the way to full understanding, although a structure of a stuck intermediate would be very helpful. The understanding of the precise details of the mechanism of targeting specificity, and actual polypeptide translocation in other systems is, however, far behind. Groups willing to do the difficult (and risky) work to understand mechanism should therefore be more actively encouraged, perhaps to pursue multidisciplinary, collaborative studies. In writing this review I have become fascinated by the cellular regulatory mechanisms that must be necessary to orchestrate the complex flow of so many polypeptides, targeted by different signals to such a wide variety of transporters. I have tried to raise questions about how this might be managed but much more needs to be done in this area. Clearly, this field is very much alive and the future will be full of revealing and surprising twists in the story.

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  1. Institut de Genetique et Microbiologie, UMR 8621 CNRS, Universite de Paris-Sud, Orsay, France

    I. Barry Holland

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  1. Technology - Hellas (FORTH), Inst. Molecular Biology & Biotechnology, Foundation for Research &, Nikolaou Plastira 100, Iraklion, 700 13, Greece

    Anastassios Economou

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Holland, I.B. (2010). The Extraordinary Diversity of Bacterial Protein Secretion Mechanisms. In: Economou, A. (eds) Protein Secretion. Methods in Molecular Biology, vol 619. Humana Press. https://doi.org/10.1007/978-1-60327-412-8_1

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