Abstract
ABSTRACTS-Adenosyl-l-methionine synthetase (SAM-s) catalyzes the biosynthesis of SAM from ATP andl-methionine. Despite extensive research with many organisms, its role inStreptomycessp. remains unclear. In the present study, the putative SAM-s gene was isolated from a spectinomycin producer,Streptomyces spectabilis. The purified protein from the transformedEscherichia coliwith the isolated gene synthesized SAM froml-methionine and ATP in vitro, strongly indicating that the isolated gene indeed encoded the SAM-s protein. The overexpression of the SAM-s gene inStreptomyces lividansTK23 inhibited sporulation and aerial mycelium formation but enhanced the production of actinorhodin in both agar plates and liquid media. Surprisingly, the overexpressed SAM was proven by Northern analysis to increase the production of actinorhodin through the induction ofactII-ORF4, a transcription activator of actinorhodin biosynthetic gene clusters. In addition, we found that a certain level of intracellular SAM is critical for the induction of antibiotic biosynthetic genes, since the control strain harboring only the plasmid DNA did not show any induction ofactII-ORF4 until it reached a certain level of SAM in the cell. From these results, we concluded that the SAM plays important roles as an intracellular factor in both cellular differentiation and antibiotic production inStreptomycessp.
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Dates
Type | When |
---|---|
Created | 22 years, 7 months ago (Jan. 2, 2003, 2:30 p.m.) |
Deposited | 2 years, 4 months ago (April 25, 2023, 1:47 p.m.) |
Indexed | 1 day, 16 hours ago (Aug. 26, 2025, 2:57 a.m.) |
Issued | 22 years, 7 months ago (Jan. 15, 2003) |
Published | 22 years, 7 months ago (Jan. 15, 2003) |
Published Print | 22 years, 7 months ago (Jan. 15, 2003) |
@article{Kim_2003, title={Accumulation ofS-Adenosyl<scp>-l-</scp>Methionine Enhances Production of Actinorhodin but Inhibits Sporulation inStreptomyces lividansTK23}, volume={185}, ISSN={1098-5530}, url={http://dx.doi.org/10.1128/jb.185.2.592-600.2003}, DOI={10.1128/jb.185.2.592-600.2003}, number={2}, journal={Journal of Bacteriology}, publisher={American Society for Microbiology}, author={Kim, Dong-Jin and Huh, Jung-Hyun and Yang, Young-Yell and Kang, Choong-Min and Lee, In-Hyung and Hyun, Chang-Gu and Hong, Soon-Kwang and Suh, Joo-Won}, year={2003}, month=jan, pages={592–600} }