Characterization of a new ScbR-like γ-butyrolactone binding regulator (SlbR) in Streptomyces coelicolor
2012
Yang, Yung-Hun | Song, Eunjung | Kim, Ji-Nu | Lee, Bo-Rahm | Kim, Eun-jung | Park, Sung-Hee | Kim, Woo-Seong | Park, Hyung-Yeon | Jeon, Jong-Min | Rajesh, Thangamani | Kim, Yun-gon | Kim, Byung-Gee
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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