1. Department of Applied Chemistry, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya 466-8555, Japan, Nagoya Municipal Industrial Research Institute, Rokuban 3-4-41, Atsuta-ku, Nagoya 456-0058, Japan, and Division of Biochemistry and Molecular Biology, Glasgow Biomedical Research Centre, Institute of Biomedical and Life Sciences, University of Glasgow, 126 University Place, G12 8TA, UK