1. Institute for Biochemistry, ETH Zürich, Zürich, Switzerland
2. Institute of Molecular Biology and Biophysics, ETH Zürich, Zürich, Switzerland
3. Scientific Center for Optical and Electron Microscopy, ETH Zürich, Zürich, Switzerland
4. Department of Biochemistry, Max F. Perutz Laboratories, University of Vienna, Vienna, Austria
5. Department of Fundamental Microbiology, University of Lausanne, Lausanne, Switzerland
6. Department of Nuclear Magnetic Resonance–Supported Structural Biology, Leibniz Institute of Molecular Pharmacology, Berlin, Germany