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Infection and Immunity, January 2009, p. 539-548, Vol. 77, No. 1
0019-9567/09/$08.00+0     doi:10.1128/IAI.01034-08
Copyright © 2009, American Society for Microbiology. All Rights Reserved.

Multiple Functional Domains of Enterococcus faecalis Aggregation Substance Asc10 Contribute to Endocarditis Virulence {triangledown} ,{dagger}

Olivia N. Chuang, Patrick M. Schlievert, Carol L. Wells, Dawn A. Manias, Timothy J. Tripp,{ddagger} and Gary M. Dunny*

Department of Microbiology, University of Minnesota Medical School, Minneapolis, Minnesota 55455

Received 19 August 2008/ Returned for modification 9 October 2008/ Accepted 17 October 2008

Aggregation substance proteins encoded by sex pheromone plasmids increase the virulence of Enterococcus faecalis in experimental pathogenesis models, including infectious endocarditis models. These large surface proteins may contain multiple functional domains involved in various interactions with other bacterial cells and with the mammalian host. Aggregation substance Asc10, encoded by plasmid pCF10, is induced during growth in the mammalian bloodstream, and pCF10 carriage gives E. faecalis a significant selective advantage in this environment. We employed a rabbit model to investigate the role of various functional domains of Asc10 in endocarditis. The data suggested that the bacterial load of the infected tissue was the best indicator of virulence. Isogenic strains carrying either no plasmid, wild-type pCF10, a pCF10 derivative with an in-frame deletion of the prgB gene encoding Asc10, or pCF10 derivatives expressing other alleles of prgB were examined in this model. Previously identified aggregation domains contributed to the virulence associated with the wild-type protein, and a strain expressing an Asc10 derivative in which glycine residues in two RGD motifs were changed to alanine residues showed the greatest reduction in virulence. Remarkably, this strain and the strain carrying the pCF10 derivative with the in-frame deletion of prgB were both significantly less virulent than an isogenic plasmid-free strain. The data demonstrate that multiple functional domains are important in Asc10-mediated interactions with the host during the course of experimental endocarditis and that in the absence of a functional prgB gene, pCF10 carriage is actually disadvantageous in vivo.

* Corresponding author. Mailing address: Department of Microbiology, University of Minnesota Medical School, 420 Delaware Street SE, Minneapolis, MN 55455. Phone: (612) 625-9930. Fax: (612) 626-0623. E-mail: dunny001{at}umn.edu

{triangledown} Published ahead of print on 27 October 2008.

{dagger} Supplemental material for this article may be found at http://iai.asm.org/.

Editor: V. J. DiRita

{ddagger} Present address: Syntiron LLC, Suite 109, St. Paul, MN 55114.

Infection and Immunity, January 2009, p. 539-548, Vol. 77, No. 1
0019-9567/09/$08.00+0     doi:10.1128/IAI.01034-08
Copyright © 2009, American Society for Microbiology. All Rights Reserved.





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