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Mutational analysis of the Yersinia enterocolitica virC operon : characterization of yscE, F, G, I, J, K required for Yop secretion and yscH encoding YopR

Allaoui, A. and Schulte, R. and Cornelis, G. R.. (1995) Mutational analysis of the Yersinia enterocolitica virC operon : characterization of yscE, F, G, I, J, K required for Yop secretion and yscH encoding YopR. Molecular microbiology, Vol. 18, H. 2. S. 343-355.

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Official URL: http://edoc.unibas.ch/dok/A5259218

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Abstract

Pathogenic yersiniae secrete the Yop anti-host proteins using a type-III secretion pathway. The components of the secretion machinery are encoded by three loci on the pYV plasmid: virA, virB, and virC. In this paper we describe the characterization of eight non-polar mutants of the virC locus, constructed by allelic exchange. The yscE, FG, I, J and K mutants were defective in Yop secretion and independent of Ca2+ (CI) for their growth at 37 degrees C. Substitution of the 12 N-terminal amino-acid residues of YscF impaired secretion of YopB and YopD only and led also to a CI phenotype. The culture supernatant of the yscH mutant contained all the Yops except the 18 kDa YopR. Complementation experiments and an immunoblot analysis confirmed that YopR is encoded by the yscH gene. The LD50 for the mouse of the yscH mutant was 10-fold higher than that of the parental strain indicating that YopR is involved in pathogenesis. The phenotype of the yscM mutant was similar to that of the wild-type strain. However, overproduction of YscM from a multicopy plasmid in wild-type Yersinia enterocolitica prevented Yop secretion and synthesis. A hybrid YopH-LacZ' protein, encoded by a gene transcribed from the lac promoter, was secreted by a strain overexpressing YscM, showing that the secretion machinery was still functional. These results indicate that YscM plays a role in the feedback inhibition of Yop synthesis when secretion is compromised by acting as a negative regulator of Yop synthesis.
Faculties and Departments:05 Faculty of Science > Departement Biozentrum > Former Organization Units Biozentrum > Molecular Microbiology (Cornelis)
UniBasel Contributors:Cornelis, Guy R.
Item Type:Article, refereed
Bibsysno:Link to catalogue
Publisher:Blackwell
ISSN:0950-382X
Note:Publication type according to Uni Basel Research Database: Journal article
Last Modified:22 Mar 2012 14:20
Deposited On:22 Mar 2012 13:22

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