1. Institute for Protein Research, Osaka University, 3-2 Yamadaoka, Suita, Osaka 565-0871, Japan, Tokyo University Marine Science and Technology, 4-5-7 Kouonan, Minato-ku, Tokyo 108-8477, Japan, Graduate School of Pharmaceutical Sciences, Kumamoto University, 5-1 Oe-honmachi, Kumamoto 862-0973, Japan, and RIKEN Harima Institute at SPring8, 1-1-1 Kouto, Mikazuki-cho, Sayo-gun, Hyogo 679-5148, Japan