γ-Butyrolactones in Streptomyces are well recognized as bacterial hormones, and they affect secondary metabolism of Streptomyces. γ-Butyrolactone receptors are considered important regulatory proteins, and various γ-butyrolactone synthases and receptors have been reported in Streptomyces. Here, we characterized a new regulator, SCO0608, that interacted with SCB1 (γ-butyrolactone of Streptomyces coelicolor) and bound to the scbR/A and adpA promoters. The SCO0608 protein sequences are not similar to those of any known γ-butyrolactone binding proteins in Streptomyces such as ScbR from S. coelicolor or ArpA from Streptomyces griseus. Interestingly, SCO0608 functions as a repressor of antibiotic biosynthesis and spore formation in R5 complex media. We showed the existence of another type of γ-butyrolactone receptor in Streptomyces, and this SCO0608 was named ScbR-like γ-butyrolactone binding regulator (SlbR) in S. coelicolor.
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Acknowledgments The authors thank John Innes Center for providing the cosmid library. This work was supported by the Global Frontier Program for Intelligent Synthetic Biology, Basic Science Research Program (2010-0009942) and Priority Research Centers Program (2009-0094021) through the National Research Foundation grant funded by the Korea Government (MEST). This subject is also partially supported by the Korea Ministry of Environment as a “Converging Technology Project (201-101-007).”
- Antibiotic production
- DNA affinity capture assay
- scbR/A promoter
- Streptomyces coelicolor