1. Institute of Pharmacy and Biochemistry; Johannes Gutenberg-University Mainz; Johann-Joachim-Becherweg 31 55128 Mainz Germany
2. Biomolekulares Magnetresonanz Zentrum (BMRZ); Goethe-Universität Frankfurt; Max-von-Laue Str. 9 60438 Frankfurt/M Germany
3. Institute of Physical and Theoretical Chemistry; Julius-Maximilians-University Würzburg; Emil-Fischer-Straße 42 97074 Würzburg Germany
4. Synchrotron Crystallography Team; EMBL Grenoble Outstation; 71 Avenue des Martyrs 38042 Grenoble France
5. Institute of Organic Chemistry; Johannes Gutenberg-University Mainz; Duesbergweg 10-14 55128 Mainz Germany
6. Rudolf Virchow Center for Experimental Biomedicine; Julius-Maximilians-University Würzburg; Josef-Schneider-Straße 2, Haus D15 97080 Würzburg Germany
7. Biochemistry Center (BZH); Ruprecht-Karls-University Heidelberg; Im Neuenheimer Feld 328 69120 Heidelberg Germany