1. Department
of Biophysics, Ruhr-Universität Bochum, Universitätsstrasse 150, 44801 Bochum, Germany
2. Center
for Integrated Protein Science Munich (CIPSM), Chemistry Department, Technische Universität München, Lichtenbergstrasse 4, 85747 Garching, Germany
3. Department
of Physical Biochemistry, Max Planck Institute of Molecular Physiology, Otto-Hahn-Strasse 11, 44227 Dortmund, Germany