[1] Natl Inst Agrobiol Resources, Struct Biol Unit, Tsukuba, Ibaraki 3058602, Japan
[2] Kyoto Pharmaceut Univ, Dept Med Chem, Yamashima Ku, Kyoto 6078414, Japan
[3] Natl Inst Dent & Craniofacial Res, Mol Struct Biol Unit, NIAMSD, Prot Express Lab,NIH, Bethesda, MD 20892 USA