1. Contribution from the Department of Biosciences and Bioinformatics, Kyushu Institute of Technology, Iizuka, Fukuoka, 820-8502, Japan, Department of Chemistry and Biochemistry, Kyushu University, Fukuoka, Japan, Neutron Research Center and Center for Promotion of Computational Science and Engineering, Japan Atomic Energy Research Institute, 8-1, Umemidai, Soraku-gun, Kyoto, 619-0215, Japan, PRESTO, Japan Science and Technology Agency, and Advanced Technology Institute, Shiki, Saitama, Japan