Title Identification of a Novel Streptomyces chattanoogensis L10 and Enhancing Its Natamycin Production by Overexpressing Positive Regulator ScnRII
Author Yi-Ling Du, Shi-Fei Chen, Liang-Ying Cheng, Xue-Ling Shen, Yuan Tian, and Yong-Quan Li*
Address Institute of Biochemistry, College of Life Sciences, Zhejiang University, Hangzhou, Zhejiang 310058, P. R. China
Bibliography Journal of Microbiology, 47(4),506-513, 2009,
Key Words Streptomyces chattanoogensis L10, natamycin, pathway-specific regulatory genes, strain improvement, genetic engineering
Abstract A novel Streptomyces strain, L10, which is capable of producing natamycin, was isolated from a soil sample collected from Zhejiang province, China. On the basis of phylogenetic analysis of rpoB gene and 16S rDNA sequences, as well as phenotypic comparison, strain L10 (CGMCC 2644) is proposed to be a previously uncharacterized strain of S. chattanoogensis. By screening a cosmid library of strain L10 and primer walking, a partial sequence of scnRI and the entire sequence of scnRII were obtained, which are orthologues to the pathway-specific positive regulator genes of natamycin biosynthesis in S. natalensis. The engineered S. chattanoogensis D1, generated by inserting an additional copy of scnRII into the chromosome of strain L10, increased its natamycin production by 3.3 fold in YSG medium and 4.6 fold in YEME medium without sucrose.