1. Centre
for Structural Systems Biology, Helmholtz Centre for Infection Research (CSSB-HZI), German Electron Synchrotron (DESY), Hamburg 22607, Germany
2. Institute for Biological Interfaces 2 (IBG-2), Karlsruhe Institute for Technology (KIT), PO Box 3640, 76021 Karlsruhe, Germany
3. Department
of Biochemistry, University of Oulu, Oulu 90014, Finland
4. Biocenter
Oulu, University of Oulu, Oulu 90220, Finland
5. Department
of Chemistry, University of Hamburg, Hamburg 20146, Germany