1. Department of Structural BiochemistryMax-Planck-Institute of Molecular Physiology Otto-Hahn-Strasse 11 44227 Dortmund Germany
2. Crystallography and Biophysics UnitMax-Planck-Institute of Molecular Physiology Otto-Hahn-Strasse 11 44227 Dortmund Germany
3. Department of Chemical Engineering and BiotechnologyUniversity of Applied Sciences Darmstadt Stephanstrasse 7 64295 Darmstadt Germany