1. Department of Chemistry and Applied Biosciences, Swiss Federal Institute of Technology (ETH), Vladimir-Prelog-Weg 4, 8093 Zurich, Switzerland
2. Department
of Molecular Biology, Division of Microbiology, Paris-Lodron University of Salzburg, 5020 Salzburg, Austria
3. Institute of Biochemistry, Swiss Federal Institute of Technology (ETH), Otto-Stern-Weg-3, 8093 Zurich, Switzerland
4. Institute
of Chemistry and Biochemistry, Freie Universität Berlin, 14195 Berlin, Germany