1. Institute of Structural Biology, Helmholtz Zentrum München, Ingolstädter Landstr. 1, 85764 Neuherberg, Germany
2. Center for Integrated Protein Science Munich and Chair of Biomolecular NMR, TU München, Lichtenbergstr. 4, 85747 Garching, Germany
3. Central European Institute of Technology, Masaryk University, Kamenice 5, 62500 Brno, Czech Republic
4. Institute of Biological
Chemistry, University of Vienna, Währingerstr. 38, 1090 Vienna, Austria