Abstract:
:Yersinia enterocolitica transports YscM1 and YscM2 via the type III pathway, a mechanism that is required for the establishment of bacterial infections. Prior to host cell contact, YscM1 and YscM2 exert posttranscriptional regulation to inhibit expression of effector yop genes, which encode virulence factors that travel the type III pathway into the cytoplasm of macrophages. Relief from repression has been predicted to occur via the type III secretion of YscM1 and YscM2 into the extracellular medium, resulting in the depletion of regulatory molecules from the bacterial cytoplasm. Using digitonin fractionation and fluorescence microscopy of FlAsH-labeled polypeptides in Yersinia-infected cells, we have localized YscM1 and YscM2 within the host cell cytoplasm. Type III injection of YscM1 and YscM2 required the SycH chaperone. Expression of C-terminal fusions of YscM1 and YscM2 to the neomycin phosphotransferase reporter revealed sequences required for regulatory activity and for secretion in the absence of SycH. Coexpression of SycH and glutathione S-transferase (GST)-YscM1 or GST-YscM2, hybrid GST variants that cannot be transported by the type III apparatus, also relieved repression of Yop synthesis. GST-SycH bound to YscM1 and YscM2 and activated effector yop expression without initiation of the bound regulatory molecules into the type III pathway. Further, regulation of yop expression by YscM1, YscM2, and SycH is shown to act independently of factors that regulate secretion, and gel filtration chromotography revealed populations of YscM1 and YscM2 that are not bound to SycH under conditions where Yop synthesis is repressed. Taken together, these results suggest that YscM1- and YscM2-mediated repression may be relieved through binding to the cytoplasmic chaperone SycH prior to their type III injection into host cells.
journal_name
J Bacterioljournal_title
Journal of bacteriologyauthors
Cambronne ED,Sorg JA,Schneewind Odoi
10.1128/jb.186.3.829-841.2004keywords:
subject
Has Abstractpub_date
2004-02-01 00:00:00pages
829-41issue
3eissn
0021-9193issn
1098-5530journal_volume
186pub_type
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journal_title:Journal of bacteriology
pub_type: 杂志文章
doi:10.1128/JB.01249-06
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journal_title:Journal of bacteriology
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doi:10.1128/JB.103.3.833-835.1970
更新日期:1970-09-01 00:00:00
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journal_title:Journal of bacteriology
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journal_title:Journal of bacteriology
pub_type: 杂志文章
doi:10.1128/JB.150.3.1244-1251.1982
更新日期:1982-06-01 00:00:00
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journal_title:Journal of bacteriology
pub_type: 杂志文章
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更新日期:1971-12-01 00:00:00
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journal_title:Journal of bacteriology
pub_type: 杂志文章
doi:10.1128/JB.149.1.79-91.1982
更新日期:1982-01-01 00:00:00
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更新日期:2003-10-01 00:00:00
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journal_title:Journal of bacteriology
pub_type: 杂志文章
doi:10.1128/JB.83.3.500-506.1962
更新日期:1962-03-01 00:00:00
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更新日期:1993-04-01 00:00:00
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journal_title:Journal of bacteriology
pub_type: 杂志文章
doi:10.1128/jb.171.1.436-446.1989
更新日期:1989-01-01 00:00:00
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pub_type: 杂志文章
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更新日期:1973-06-01 00:00:00
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pub_type: 杂志文章
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更新日期:2006-11-01 00:00:00
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journal_title:Journal of bacteriology
pub_type: 杂志文章
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更新日期:2003-11-01 00:00:00
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journal_title:Journal of bacteriology
pub_type: 杂志文章
doi:10.1128/jb.177.3.508-516.1995
更新日期:1995-02-01 00:00:00
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journal_title:Journal of bacteriology
pub_type: 杂志文章
doi:10.1128/JB.146.1.149-154.1981
更新日期:1981-04-01 00:00:00
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journal_title:Journal of bacteriology
pub_type: 杂志文章
doi:10.1128/jb.165.1.336-339.1986
更新日期:1986-01-01 00:00:00
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journal_title:Journal of bacteriology
pub_type: 杂志文章
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更新日期:1977-02-01 00:00:00
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journal_title:Journal of bacteriology
pub_type: 杂志文章
doi:
更新日期:1965-02-01 00:00:00
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pub_type: 杂志文章
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更新日期:1988-05-01 00:00:00
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更新日期:1992-10-01 00:00:00
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更新日期:2003-07-01 00:00:00
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更新日期:2001-03-01 00:00:00
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journal_title:Journal of bacteriology
pub_type: 杂志文章
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更新日期:1965-01-01 00:00:00
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journal_title:Journal of bacteriology
pub_type: 杂志文章
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更新日期:2009-11-01 00:00:00
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pub_type: 杂志文章
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更新日期:1974-11-01 00:00:00
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journal_title:Journal of bacteriology
pub_type: 杂志文章
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更新日期:1962-11-01 00:00:00
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journal_title:Journal of bacteriology
pub_type: 杂志文章
doi:10.1128/JB.106.3.720-723.1971
更新日期:1971-06-01 00:00:00
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journal_title:Journal of bacteriology
pub_type: 杂志文章
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更新日期:1997-01-01 00:00:00
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journal_title:Journal of bacteriology
pub_type: 杂志文章
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更新日期:1999-09-01 00:00:00
abstract::The enzyme pattern of Saccharomyces cerevisiae was followed during batch growth and in continuous culture in a synthetic medium limited for glucose under aerobic conditions. Seven enzymes were measured: succinate-cytochrome c oxidoreductase, malate dehydrogenase, nicotinamide adenine dinucleotide-linked glutamate dehy...
journal_title:Journal of bacteriology
pub_type: 杂志文章
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更新日期:1968-08-01 00:00:00