1. Molecular Biotechnology, Leiden University, PO Box 9505, 2300RA Leiden, The Netherlands
2. State Key Laboratory of Microbial Technology, Institute of Microbial Technology, Shandong University, Qingdao, Shandong 266237, P. R. China
3. Department of Biochemistry and Food Chemistry, University of Turku, FIN-20014 Turku, Finland
4. Laboratory of Biomolecular Research, Division of Biology and Chemistry, Paul Scherrer Institut, CH-5232 Villigen, Switzerland
5. State Key Laboratory of Biocatalysis and Enzyme Engineering, School of Life Sciences, Hubei University, Wuhan, Hubei 43420, P. R. China
6. Bio-nano diffraction Biozentrum, Paul Scherrer Institut, CH-5232 Villigen, Switzerland
7. Biozentrum, University of Basel, Mattenstrasse 26, CH-4058 Basel, Switzerland