Department of Chemistry, Graduate School of Science, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan, Nanomaterial Design Center, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan, and Institute for Protein Research, Osaka University, Suita, Osaka 565-0871, Japan(2009-11-12時点)