1. Biomolecular Characterization Unit, RIKEN Center for Sustainable Resource Science, Wako-shi, Saitama 351-0198, Japan
2. Department of Chemistry, Graduate School of Science, Tokyo Metropolitan University, Hachioji-shi, Tokyo 192-0397, Japan
3. Department of Biotechnology, Global Innovation Research Institute, Tokyo University of Agriculture and Technology, Fuchu-shi, Tokyo 183-8509, Japan
4. Department of Structural Biology, Weizmann Institute of Science, Rehovot 761001, Israel