1. Industrial Enzymes National Engineering Laboratory; Tianjin Institute of Industrial Biotechnology; Chinese Academy of Sciences; Tianjin 300308 China
2. Institute of Biological Chemistry; Academia Sinica; Taipei 11529 Taiwan
3. AsiaPac Biotechnology Co., Ltd.; Dongguan 523808 China
4. Department of Chemistry; University of Illinois; Urbana IL 61801 USA