[1] Univ Grenoble 1, CEA, CNRS, Lab Biophys Mol & Cellulaire,DRDC,UMR 5090, F-38054 Grenoble 9, France
[2] Inst Curie, CNRS, UMR 168, F-75231 Paris 05, France
[3] CEA, LRC, F-75231 Paris, France
[4] CNRS, Inst Biol Struct & Microbiol, Chim Bacterienne Lab, UPR 9043, F-13402 Marseille 20, France
[5] Univ Lyon 1, CNRS, Inst Biol & Chim Prot, UMR 5086, F-69367 Lyon 07, France
[6] Univ Lyon 1, CNRS, Inst Biol & Chim Prot, IFR 128, F-69367 Lyon 07, France