1 Biomolecular NMR and Center for Integrated Protein Science Munich at Department Chemie, Technical University of Munich, Garching, Germany.
2 Institute of Structural Biology, Helmholtz Zentrum Munchen, Neuherberg, Germany.
3 Department of Biochemistry, Faculty of Chemistry, Wroclaw University of Science and Technology, Wroclaw, Poland.
4 Institute for Medical Microbiology, Immunology and Hygiene, Technical University of Munich, Munich, Germany.
5 Biomolecular NMR and Center for Integrated Protein Science Munich at Department Chemie, Technical University of Munich, Garching, Germany michael.sattler@helmholtz-muenchen.de grzegorz.popowicz@helmholtz-muenchen.de.