1. Institute of Biochemistry, Graz University of Technology, Petersgasse 12/II, 8010 Graz, Austria.
2. Center for Integrated Protein Science Munich, Technische Universität München, Department of Chemistry, Lichtenbergstraße 4, 85748 Garching, Germany.
3. Institute of Structural Biology, Helmholtz Zentrum München, Ingolstädter Landstraße 1, 85764 Neuherberg, Germany.
4. Institute of Molecular Biology and Biochemistry, Medical University of Graz, Harrachgasse 21/III, 8010 Graz, Austria.