UpaG, a new member of the Trimeric Autotransporter family of Adhesins in Uropathogenic Escherichia coli

Valle, Jaione, Mabbett, Amanda N., Ulett, Glen C., Toledo-Arana, Alejandro, Wecker, Karine, Totsika, Makrina, Schembri, Mark A., Ghigo, Jean-Marc, & Beloin, Christophe (2008) UpaG, a new member of the Trimeric Autotransporter family of Adhesins in Uropathogenic Escherichia coli. Journal of Bacteriology, 190(12), pp. 4147-4161.

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The ability of Escherichia coli to colonize both intestinal and extraintestinal sites is driven by the presence of specific virulence factors, among which are the autotransporter (AT) proteins. Members of the trimeric AT adhesin family are important virulence factors for several gram-negative pathogens and mediate adherence to eukaryotic cells and extracellular matrix (ECM) proteins. In this study, we characterized a new trimeric AT adhesin (UpaG) from uropathogenic E. coli (UPEC). Molecular analysis of UpaG revealed that it is translocated to the cell surface and adopts a multimeric conformation. We demonstrated that UpaG is able to promote cell aggregation and biofilm formation on abiotic surfaces in CFT073 and various UPEC strains. In addition, UpaG expression resulted in the adhesion of CFT073 to human bladder epithelial cells, with specific affinity to fibronectin and laminin. Prevalence analysis revealed that upaG is strongly associated with E. coli strains from the B2 and D phylogenetic groups, while deletion of upaG had no significant effect on the ability of CFT073 to colonize the mouse urinary tract. Thus, UpaG is a novel trimeric AT adhesin from E. coli that mediates aggregation, biofilm formation, and adhesion to various ECM proteins.

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ID Code: 77413
Item Type: Journal Article
Refereed: Yes
DOI: 10.1128/JB.00122-08
ISSN: 0021-9193
Divisions: Current > Schools > School of Biomedical Sciences
Current > QUT Faculties and Divisions > Faculty of Health
Current > Institutes > Institute of Health and Biomedical Innovation
Copyright Owner: Copyright 2008 American Society for Microbiology
Deposited On: 10 Oct 2014 00:18
Last Modified: 15 Oct 2014 03:47

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