1. School of Life Science and Technology, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama, Kanagawa 226-8503, Japan
2. NMR Division, RIKEN SPring-8 Center, RIKEN, 1-7-22 Suehiro-cho, Tsurumi-ku, Yokohama, Kanagawa 230-0045, Japan
3. Department of Chemistry, University of Illinois at Chicago, Chicago, Illinois 60607, United States
4. RIKEN Center for Biosystems Dynamics Research, RIKEN, 1-7-22 Suehiro-cho, Tsurumi-ku, Yokohama, Kanagawa 230-0045, Japan
5. Department of Biochemistry and Molecular Biology, The University of Chicago, Chicago, Illinois 60637, United States
6. Department of Pathology, The University of Chicago, Chicago, Illinois 60637, United States