1. Department of Molecular Biochemistry, Faculty of Chemistry and Biochemistry, Ruhr University Bochum, Bochum 44801, Germany
2. Department of Chemistry & Nano-Science Center, University of Copenhagen, Copenhagen DK-2100, Denmark
3. Department of Biochemistry, Weill Cornell Medical College, New York, New York 10065, United States
4. NovoNordisk Foundation Center for Protein Research,Copenhagen DK-2200, Denmark
5. Department of Plant and Environmental Sciences, University of Copenhagen,Frederiksberg C DK-1871, Denmark