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Calcium-regulated type III secretion of Yop proteins by an Escherichia coli hha mutant carrying a Yersinia pestis pCD1 virulence plasmid.
Department of Microbiology and Immunology, University of Miami Miller School of Medicine.
2006 (English)In: Infection and Immunity, ISSN 0019-9567, E-ISSN 1098-5522, Vol. 74, no 2, 1381-6 p.Article in journal (Refereed) Published
Abstract [en]

A series of four large deletions that removed a total of ca. 36 kb of DNA from the ca. 70-kb Yersinia pestis pCD1 virulence plasmid were constructed using lambda Red-mediated recombination. Escherichia coli hha deletion mutants carrying the virulence plasmid with the deletions expressed a functional calcium-regulated type III secretion system. The E. coli hha/pCD1 system should facilitate molecular studies of the type III secretion process.

Place, publisher, year, edition, pages
2006. Vol. 74, no 2, 1381-6 p.
URN: urn:nbn:se:umu:diva-33950DOI: 10.1128/IAI.74.2.1381-1386.2006PubMedID: 16428789OAI: diva2:318870
Available from: 2010-05-11 Created: 2010-05-11 Last updated: 2010-05-12
In thesis
1. Outer membrane proteins of Yersinia pestis: Ail and OmpA
Open this publication in new window or tab >>Outer membrane proteins of Yersinia pestis: Ail and OmpA
2010 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

A vast number of studies have been completed on the virulence determinants of Yersinia spp.; however, the focus of many of these studies has been on the virulence plasmid and the plasmid-encoded Type three secretion system. Nevertheless, many chromosomal genes whose products are directly involved in virulence have also been identified. Some of these critical virulence determinants are outer membrane proteins. Outer membrane proteins of Gram-negative bacteria often have important physiological roles; however, some have also been found to be important for pathogenesis. In this thesis, we investigated two Yersinia. pestis outer membrane proteins, Ail and OmpA, and their roles in virulence. We provide evidence that Y. pestis Ail is a highly expressed outer membrane protein that is absolutely essential for Y. pestis to resist the killing action of the complement system present in human blood and tissues, as well as the blood and tissues of other mammalian hosts. Furthermore, Ail was important for virulence in a Y. pestis-Canorhabditis elegans model of infection.The work in this thesis also provided the first evidence that another surface-exposed outer membrane protein, termed OmpA, is required for both Yersinia pseudotuberculosis and Y. pestis to survive and proliferate intracellularly in macrophages. Finally, we provide evidence that Y. pestis has a functional small RNA MicA that controls the expression of OmpA. This is the first demonstration of sRNA-mediated regulation of a Yersinia virulence factor. This work has paved the way for future studies on the role of outer membrane proteins in virulence, particularly the role of Ail and OmpA.

Place, publisher, year, edition, pages
Umeå: Institutionen för molekylärbiologi (Teknisk-naturvetenskaplig fakultet), Umeå universitet, 2010. 89 p.
Doctoral thesis / Umeå University, Department of Molecular Biology
Yersinia pestis, outer membrane proteins, Ail, ompA
National Category
Microbiology in the medical area
Research subject
Immunology; Microbiology; Infectious Diseases
urn:nbn:se:umu:diva-33956 (URN)978-91-7459-030-2 (ISBN)
Public defence
2010-06-03, Molekylärbiologi, Major Groove, Byggnad 6L, Umeå universitet, Umeå, 10:00 (English)
Available from: 2010-05-12 Created: 2010-05-11 Last updated: 2010-05-18Bibliographically approved

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