1. Department
of Chemistry, University of Illinois at Urbana—Champaign, 600 South Mathews Avenue, Urbana, Illinois 61801, United States
2. Industrial
Enzymes National Engineering Laboratory, Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin 300308, China
3. Institute
of Biological Chemistry, Academia Sinica, Taipei 11529, Taiwan