1. Institute of Biochemistry II, University Hospital, Goethe University, Frankfurt am Main, Germany.
2. Department of Structural Biology, Max Planck Institute of Biophysics, Frankfurt am Main, Germany.
3. Centre for Biomolecular Magnetic Resonance, Institute for Biophysical Chemistry, Goethe University, Frankfurt am Main, Germany.
4. Department of Physics, University of Helsinki, Helsinki, Finland.
5. Institute of Biotechnology, University of Helsinki, Helsinki, Finland.
6. Core Facility Mass Spectrometry, Medical University of Graz, Graz, Austria.
7. Functional Proteomics, SFB815 Core Unit, Medical School, Goethe University, Frankfurt am Main, Germany.