1. INSERM, U845, Paris F-75015, France
2. Université Paris Descartes, Faculté de Medecine René Descartes, Paris F-75015, France
3. Department of Molecular Microbiology, John Innes Centre, Colney Lane, Norwich NR4 7UH, United Kingdom
4. Department of Microbiology, University of Bayreuth, Universitaetsstrasse 30, 95447 Bayreuth, Germany
5. INSERM, U571, Paris F-75015, France
6. Institut Jacques Monod, CNRS-UMR 7592, Université Paris 6 et Paris 7, 2 Place Jussieu, 75251 Cedex 05, Paris, France