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2014 ; 68
(ä): 415-38
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gab.com Text
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English Wikipedia
Bacterial type III secretion systems: specialized nanomachines for protein
delivery into target cells
#MMPMID25002086
Galán JE
; Lara-Tejero M
; Marlovits TC
; Wagner S
Annu Rev Microbiol
2014[]; 68
(ä): 415-38
PMID25002086
show ga
One of the most exciting developments in the field of bacterial pathogenesis in
recent years is the discovery that many pathogens utilize complex nanomachines to
deliver bacterially encoded effector proteins into target eukaryotic cells. These
effector proteins modulate a variety of cellular functions for the pathogen's
benefit. One of these protein-delivery machines is the type III secretion system
(T3SS). T3SSs are widespread in nature and are encoded not only by bacteria
pathogenic to vertebrates or plants but also by bacteria that are symbiotic to
plants or insects. A central component of T3SSs is the needle complex, a
supramolecular structure that mediates the passage of the secreted proteins
across the bacterial envelope. Working in conjunction with several cytoplasmic
components, the needle complex engages specific substrates in sequential order,
moves them across the bacterial envelope, and ultimately delivers them into
eukaryotic cells. The central role of T3SSs in pathogenesis makes them great
targets for novel antimicrobial strategies.