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Applied and Environmental Microbiology, October 2001, p. 4538-4545, Vol. 67, No. 10
0099-2240/01/$04.00+0   DOI: 10.1128/AEM.67.10.4538-4545.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.

The Enterococcal Surface Protein, Esp, Is Involved in Enterococcus faecalis Biofilm Formation

Alejandro Toledo-Arana,1 Jaione Valle,1 Cristina Solano,1 María Jesús Arrizubieta,1 Carme Cucarella,2 Marta Lamata,3 Beatriz Amorena,1 José Leiva,3 José Rafael Penadés,2 and Iñigo Lasa1,*

Instituto de Agrobiotecnología y Recursos Naturales and Departamento de Producción Agraria, Universidad Pública de Navarra-Consejo Superior de Investigaciones Científicas, Campus de Arrosadia, 31006 Pamplona,1 Unit of Biochemistry, Department of Basic Biomedical Sciences, Cardenal Herrera-CEU University, 46113 Moncada,2 and Department of Microbiology, University Clinics, 31008 Pamplona,3 Spain

Received 24 April 2001/Accepted 11 July 2001

The enterococcal surface protein, Esp, is a high-molecular-weight surface protein of unknown function whose frequency is significantly increased among infection-derived Enterococcus faecalis isolates. In this work, a global structural similarity was found between Bap, a biofilm-associated protein of Staphylococcus aureus, and Esp. Analysis of the relationship between the presence of the Esp-encoding gene (esp) and the biofilm formation capacity in E. faecalis demonstrated that the presence of the esp gene is highly associated (P < 0.0001) with the capacity of E. faecalis to form a biofilm on a polystyrene surface, since 93.5% of the E. faecalis esp-positive isolates were capable of forming a biofilm. Moreover, none of the E. faecalis esp-deficient isolates were biofilm producers. Depending on the E. faecalis isolate, insertional mutagenesis of esp caused either a complete loss of the biofilm formation phenotype or no apparent phenotypic defect. Complementation studies revealed that Esp expression in an E. faecalis esp-deficient strain promoted primary attachment and biofilm formation on polystyrene and polyvinyl chloride plastic from urine collection bags. Together, these results demonstrate that (i) biofilm formation capacity is widespread among clinical E. faecalis isolates, (ii) the biofilm formation capacity is restricted to the E. faecalis strains harboring esp, and (iii) Esp promotes primary attachment and biofilm formation of E. faecalis on abiotic surfaces.

* Corresponding author. Mailing address: Instituto de Agrobiotecnología y Recursos Naturales, Universidad Pública de Navarra, Campus de Arrosadia, Pamplona-31006, Spain. Phone: 34 948 24 28 34. Fax: 34 948 23 21 91. E-mail: ilasa{at}unavarra.es.

Applied and Environmental Microbiology, October 2001, p. 4538-4545, Vol. 67, No. 10
0099-2240/01/$04.00+0   DOI: 10.1128/AEM.67.10.4538-4545.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.


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Copyright © 2001 by the American Society for Microbiology. All rights reserved.