Journal
BIOSCIENCE BIOTECHNOLOGY AND BIOCHEMISTRY
Volume 75, Issue 5, Pages 910-913Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1271/bbb.100873
Keywords
Streptomyces coelicolor; S-adenosyl-L-methionine (SAM); actinorhodin; autophosphorylation; serine/threonine (Ser/Thr) kinase
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Funding
- Rural Development Administration, Republic of Korea [PJ0071912011]
- Brain Korea 21 Project (BK21)
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S-Adenosyl-L-methionine (SAM) is one of the major methyl donors in all living organisms. The exogenous treatment with SAM leads to increased actinorhodin production in Streptomyces coelicolor A3(2). In this study, mutants from different stages of the AfsK-AfsR signal transduction cascade were used to test the possible target of SAM. SAM had no significant effect on actinorhodin production in afsK, afsR, afsS, or actII-open reading frame 4 (ORF4) mutant. This confirms that afsK plays a critical role in delivering the signal generated by exogenous SAM. The afsK-pHJL-KN mutant did not respond to SAM, suggesting the involvement of the C-terminal of AfsK in binding with SAM. SAM increased the in vitro autophosphorylation of kinase AfsK in a dose-dependent manner, and also abolished the effect of decreased actinorhodin production by a Ser/Thr kinase inhibitor, K252a. In sum, our results suggest that SAM activates actinorhodin biosynthesis in S. coelicolor M130 by increasing the phosphorylation of protein kinase AfsK.
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