1. Key Laboratory of Combinatorial Biosynthesis and Drug Discovery; Ministry of Education and School of Pharmaceutical Sciences; Wuhan University; Wuhan 430071 China
2. Kekulé-Institut für Organische Chemie und Biochemie; Rheinische Friedrich-Wilhelms-Universität Bonn; Gerhard-Domagk-Strasse 1 53121 Bonn Germany
3. Hubei Engineering Laboratory for Synthetic Microbiology; Wuhan Institute of Biotechnology; Wuhan 430075 China