1. Crystallography Centre, School of Biomedical and Chemical Sciences, University of Western Australia, 35 Stirling Highway, Crawley 6009, Western Australia, Australia, National Centre for Biomolecular Research, Masaryk University, Kotlarska 2, 611 37 Brno, Czech Republic, Department of Physical Chemistry, Palacky University, 771 46 Olomouc, Czech Republic, and Graduate School of Life Sciences, Tohoku University, Katahira, Sendai 980-8577, Japan