S-Adenosylmethionine (SAM) is synthesized via the metabolic reaction involving adenosine triphosphate and l-methionine that is catalyzed by the enzyme S-adenosyl-l-methionine synthetase (SAM-s) and encoded by the gene metK. In the present study, metK with the absence of introns from Saccharomyces cerevisiae was introduced into Streptomyces actuosus, a nosiheptide (Nsh) producer. Intracellular SAM levels were determined by high-pressure liquid chromatography. Through optimizing the nutrient content of the medium, it was shown that increased SAM production induced by the overexpression of SAM-s leads to an increase in the intracellular cysteine pool and overproduction of Nsh in S. actuosus. This investigation shows that increased SAM promotes the elevated production of the non-ribosomal thiopeptide Nsh in Streptomyces sp.
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Zhang, X., Fen, M., Shi, X. et al. Overexpression of yeast S-adenosylmethionine synthetase metK in Streptomyces actuosus leads to increased production of nosiheptide. Appl Microbiol Biotechnol 78, 991–995 (2008). https://doi.org/10.1007/s00253-008-1394-5
- Streptomyces actuosus