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Chapter 22 : Type III Secretion Systems of Enteric Bacterial Pathogens

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Abstract:

This chapter covers what is known about how the enteropathogenic (EPEC)/enterohemorrhagic (EHEC) Esc/Sep, serovar Typhimurium SPI1, and Mxi/Spa type III secretion systems (TTSSs) secrete and translocate proteins into mammalian cells. Since studies of other TTSSs have guided the thinking about how the enteric TTSSs work, information about TTSSs in plant pathogens, the Ysc TTSS of species, and the flagellar TTSS of serovar Typhimurium is also discussed. Effectors delivered by the Ysc TTSS block the antimicrobial activities of macrophages, allowing species to survive and grow in lymphoid tissues. The mechanism by which TTSSs transport effector proteins across the bacterial inner membrane may have evolved from ancestral flagellar genes. The most comprehensive approaches to identify the proteins that make up the Esc/ Sep, SPI1, and Mxi/Spa secretons have involved genomic and mutational studies. In summary, recent studies have revealed many interesting details about the structures and functions of the EPEC/EHEC, , and secretons. Further work is needed to identify all the proteins, their stoichiometries, and locations in these structures. Micrographs of the purified complexes indicate that many are damaged and missing important substructures. Determining whether any of the purified complexes are functional secretons or whether all have lost essential components will require their reconstitution into lipid bilayers. Much has been learned about TTSS in enteric bacterial pathogens.

Citation: Lee C. 2003. Type III Secretion Systems of Enteric Bacterial Pathogens, p 403-422. In Hecht G (ed), Microbial Pathogenesis and the Intestinal Epithelial Cell. ASM Press, Washington, DC. doi: 10.1128/9781555817848.ch22

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Type III Flagellar Export Apparatus
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Model of the SPI1 secretion showing putative locations and functions of individual components

Citation: Lee C. 2003. Type III Secretion Systems of Enteric Bacterial Pathogens, p 403-422. In Hecht G (ed), Microbial Pathogenesis and the Intestinal Epithelial Cell. ASM Press, Washington, DC. doi: 10.1128/9781555817848.ch22
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References

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Tables

Generic image for table
TABLE 1

SPI1 secreton components conserved in other TTSSs

Citation: Lee C. 2003. Type III Secretion Systems of Enteric Bacterial Pathogens, p 403-422. In Hecht G (ed), Microbial Pathogenesis and the Intestinal Epithelial Cell. ASM Press, Washington, DC. doi: 10.1128/9781555817848.ch22
Generic image for table
TABLE 2

Chaperones and their cognate type III secreted proteins

Citation: Lee C. 2003. Type III Secretion Systems of Enteric Bacterial Pathogens, p 403-422. In Hecht G (ed), Microbial Pathogenesis and the Intestinal Epithelial Cell. ASM Press, Washington, DC. doi: 10.1128/9781555817848.ch22

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