1. Physical Chemistry, ETH Zürich 8093 Zürich Switzerland
2. Molecular Microbiology and Structural Biochemistry (MMSB) UMR 5086 CNRS/Université de Lyon, Labex Ecofect 7 passage du Vercors 69367 Lyon France
3. University Hospital Freiburg Dept. of Medicine II/Molecular Biology Medical Center University of Freiburg Freiburg Germany