1. Nara Medical University Department of Chemistry, , 840 Shojo-Cho, Kashihara, Nara 634-8521, Japan
2. Osaka University Institute for Protein Research, , 3-2 Yamadaoka, Suita, Osaka 565-0871, Japan
3. Nara Medical University Department of Microbiology and Infectious Diseases, , 840 Shojo-Cho, Kashihara, Nara 634-8521, Japan