1. Institute of Pharmacy and Food Chemistry, University of Würzburg, Am Hubland, 97074 Würzburg, Germany
2. Institut für Mikrobiologie, Technische Universität Braunschweig, Spielmannstrasse 7, 38106 Braunschweig, Germany
3. Research Center for Enzymology of Proteinfolding, Max-Planck-Institute Halle, Weinbergweg 22, 06120 Halle, Germany
4. Department of Biopolymers, University of Bayreuth, Universitätsstrasse 30, 95447 Bayreuth, Germany