1. Department of Chemistry, University of Zurich, Winterthurerstrasse 190, 8057 Zürich, Switzerland
2. Department for Microbial Physiology and Molecular Biology, Institute of Microbiology, Center for Functional Genomics of Microbes, University of Greifswald, Felix-Hausdorff-Strasse 8, 17489 Greifswald, Germany