1. State Key Laboratory of Biocatalysis and Enzyme Engineering, Hubei Key Laboratory of Industrial Biotechnology, School of Life Sciences, Hubei University, Wuhan 430062, P.R. China
2. W. M. Keck Center for Transgene Research, University of Notre Dame, Notre Dame, Indiana 46556, US
3. Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556, US