1. Department of Chemistry, Faculty of Science and Engineering, Aoyama Gakuin University, Sagamihara, Kanagawa, 229-8558, Japan
2. Protein Research Group, RIKEN Genomic Sciences Center, Tsurumi-ku, Yokohama, 230-0045, Japan
3. Department of Biophysics and Biochemistry, Graduate School of Science, University of Tokyo, Bunkyo-ku, Tokyo, 113-0033, Japan
4. School of Life Sciences, Tokyo University of Pharmacy and Life Sciences, 1432-1 Horinouchi, Hachioji, Tokyo, 192-0392, Japan