1. Institute
of Biological Chemistry, Academia Sinica, Taipei 115, Taiwan
2. Institute
of Biochemical Sciences, National Taiwan University, Taipei 106, Taiwan
3. Institute
of Biochemical Sciences, Department of Chemistry, National Tsing Hua University, Hsinchu 300, Taiwan
4. Stanford
Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Stanford University, Menlo Park, California 94025, United States
5. RIKEN SPring-8 Center, 1-1-1
Kouto, Sayo, Hyogo 679-5148, Japan