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http://dx.doi.org/10.5352/JLS.2011.21.1.96

Cloning and Functional Analysis of Gene Coding for S-Adenosyl-L-Methionine Synthetase from Streptomyces natalensis  

Yoo, Dong-Min (Department of Food Science and Biotechnology, Kyungnam University)
Hwang, Yong-Il (Department of Food Science and Biotechnology, Kyungnam University)
Choi, Sun-Uk (Department of Food Science and Biotechnology, Kyungnam University)
Publication Information
Journal of Life Science / v.21, no.1, 2011 , pp. 96-101 More about this Journal
Abstract
S-Adenosyl-L-methionine synthtase (SAM-s) catalyzes the biosynthesis of SAM from ATP and L-methionine. SAM plays important roles in the primary and secondary metabolism of cells. A metK encoding a SAM-s was searched from Streptomyces natalensis producing natamycin, a predominantly a strong antifungal agent, inhibiting the growth of both yeasts and molds and preventing the formation of aflatoxin in filamentous fungi. To obtain the metK of S. natalensis, PCR using primers designed from the two highly conserved regions for metK genes of Streptomyces strains was carried out, and an intact 1.2-kb metK gene of S. natalensis was cloned by genomic Southern hybridization with PCR product as a probe. To identify the function of the cloned metK gene, it was inserted into pSET152ET for its high expression in the Streptomyces strain, and then introduced into S. lividans TK24 as a host by transconjugation using E. coli ET12567(pUZ8002). The high expression of metK in S. lividans TK24 induced actinorhodin production on R5 solid medium, and its amount in R4 liquid medium was 10-fold higher than that by exconjugant including only pSET152ET.
Keywords
Streptomyces natalensis; S-adenosyl-L-methionine synthetase; cloning; actinorhodin;
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