About the Authors

Ana Severiano

Affiliation Instituto de Microbiologia, Instituto de Medicina Molecular, Faculdade de Medicina de Lisboa, Lisboa, Portugal

João A. Carriço

jcarrico@fm.ul.pt

Affiliation Instituto de Microbiologia, Instituto de Medicina Molecular, Faculdade de Medicina de Lisboa, Lisboa, Portugal

D. Ashley Robinson

Affiliation Department of Microbiology, University of Mississippi Medical Center, Jackson, Mississippi, United States of America

Mário Ramirez

Affiliation Instituto de Microbiologia, Instituto de Medicina Molecular, Faculdade de Medicina de Lisboa, Lisboa, Portugal

Francisco R. Pinto

Affiliation Departamento de Química e Bioquímica, Centro de Química e Bioquímica, Faculdade de Ciências da Universidade de Lisboa, Lisboa, Portugal

Competing Interests

M.R. has consulted for Wyeth Pharmaceuticals. The remaining authors have declared that no competing interests exist. This does not alter the authors‚ adherence to all the PLoS ONE policies on sharing data and materials.

Author Contributions

Conceived and designed the experiments: AS JAC MR FRP. Performed the experiments: AS JAC MR FRP. Analyzed the data: AS JAC DAR MR FRP. Contributed reagents/materials/analysis tools: AS JAC DAR MR FRP. Wrote the paper: AS JAC DAR MR FRP.