1. Structure and Function of Proteins; Helmholtz Centre for Infection Research; Inhoffenstrasse 7 38124 Braunschweig Germany
2. Department of Microbial Natural Products; Helmholtz Institute for Pharmaceutical Research Saarland; Centre for Infection Research and Pharmaceutical Biotechnology; Saarland University; Universitätscampus Gebäude E8 1 66123 Saarbrücken Germany
3. Institut für Biochemie; Biotechnologie und Bioinformatik; Technische Universität Braunschweig; Spielmannstrasse 7 38106 Braunschweig Germany