1. Bavarian NMR Center, Department of Chemistry, Technical University of Munich, Garching 85748, Germany
2. Institute of Structural Biology, Helmholtz Zentrum München, Neuherberg 85764, Germany
3. School of Chemistry, Bio21 Institute, University of Melbourne, Melbourne, Victoria 3010, Australia
4. Department of Infectious Diseases, Molecular Virology, University of Heidelberg, Heidelberg 69120, Germany
5. Division of Virus-Associated Carcinogenesis (F170), German Cancer Research Center (DKFZ), Heidelberg 69120, Germany