1. Department of Biochemistry, Gene Center, Ludwig-Maximilians-Universität LMU, Feodor-Lynen-Strasse 25, 81377 Munich, Germany
2. Department of Chemistry, Faculty of Chemistry and Pharmacy, Ludwig-Maximilians-Universität LMU, Butenandtstrasse 5-13, 81377 Munich, Germany
3. Department of Natural Sciences, Lebanese American University, Beirut 1102-2801, Lebanon
4. Université Libre de Bruxelles, IRIBHM, Brussels B-1070, Belgium
5. Department of Physical Chemistry, Rudjer Boskovic Institute, 10000 Zagreb, Croatia
6. Department of Structural Biology, St. Jude Children's Research Hospital, 262 Danny Thomas Place, Memphis, TN 38105, USA