1. Institute of Physical and Theoretical Chemistry TU Braunschweig 38106 Braunschweig Germany
2. Braunschweig Integrated Centre of Systems Biology (BRICS) 38106 Braunschweig Germany
3. Computational Biochemistry, Center of Medical Biotechnology University of Duisburg-Essen 45141 Essen Germany
4. Department of Physical Chemistry II Ruhr University 44780 Bochum Germany
5. Department of Chemistry and Biochemistry University of California-Los Angeles 90095 Los Angeles, CA USA