1. Architecture et Fonction des Macromolecules Biologiques; UMR 7257; CNRS and Aix-Marseille University; Case 932; 163 Avenue de Luminy; 13288; Marseille; Cedex 09; France
2. Department of Microbiology and Biotechnology; Max Rubner-Institut (Federal Research Institute of Nutrition and Food); Hermann-Weigmann-Str. 1; D-24103; Kiel; Germany