1. Institute of Structural Biology; Helmholtz Zentrum München; Ingolstädter Landstraße 1 85764 Neuherberg Germany
2. Center for Integrated Protein Science Munich at Chair Biomolecular NMR; Department Chemie; Technische Universität München; Lichtenbergstraße 4 85747 Garching Germany
3. Department of Chemistry; Humboldt Universität zu Berlin; 12489 Berlin Germany
4. Center for Integrated Protein Science at the Department of Chemistry; Ludwig-Maximilians-Universität München; Butenandtstraße 5-13 81377 Munich Germany