LcrQ/YscM1, regulators of the Yersinia yop virulon, are injected into host cells by a chaperone-dependent mechanism

被引:70
作者
Cambronne, ED [1 ]
Cheng, LW [1 ]
Schneewind, O [1 ]
机构
[1] Univ Calif Los Angeles, Sch Med, Dept Microbiol & Immunol, Los Angeles, CA 90095 USA
关键词
D O I
10.1046/j.1365-2958.2000.01974.x
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
Pathogenic Yersinia species employ type III machines to secrete YopBDR into the extracellular milieu. After attaching to host cells, yersiniae transform the type III machinery into an injection device and target YopEHMNOPT into eukaryotic cells. Yersinia pseudotuberculosis LcrQ is a transcriptional regulator that prevents the expression of yop genes. We report that LcrQ is injected into eukaryotic cells. YscM1, the transciptional regulator of Yersinia enterocolitica, is also injected into eukaryotic cells, whereas the related YscM2 protein remains associated with bacterial cells. Type III targeting of YscM1 requires binding to the SycH chaperone. Chaperone binding as well as depletion of YscM1 and YscM2 from the cytoplasm of Y. enterocolitica causes an increase in yop expression, whereas a block in regulator export reduces expression. We propose a model whereby the chaperone-mediated injection of LcrQ/YscM1 functions as a regulatory switch for bacteria that are attached to host cells, triggering the expression of Yops that travel the type III targeting pathway.
引用
收藏
页码:263 / 273
页数:11
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