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A complex role for the g-butyrolactone SCB1 in regulating antibiotic production in Streptomyces coelicolor A3(2)

By Eriko Takano, Rekha Chakraburtty, Takuya Nihira, Yashuhiro Yamada, Mervyn J. Bibb and Centre Colney Lane


Many streptomycetes produce extracellular g-butyrolactones. In several cases, these have been shown to act as signals for the onset of antibiotic production. Synthesis of these molecules appears to require a member of the AfsA family of proteins (AfsA is required for A-factor synthesis of the g-butyrolactone A-factor and consequently for streptomycin production in Streptomyces griseus). An afsA homologue, scbA, was identified in Streptomyces coelicolor A3(2) and was found to lie adjacent to a divergently transcribed gene, scbR, which encodes a g-butyrolactone binding protein. Gel retardation assays and DNase I footprinting studies revealed DNA binding sites for ScbR at 2 4to2 33 nt with respect to the scbA transcriptional start site, and at 2 42 to 2 68 nt with respect to the scbR transcriptional start site. Addition of the g-butyrolactone SCB1 of S. coelicolor resulted in loss of the DNA-binding ability of ScbR. A scbA mutant produced no g-butyrolactones, yet overproduced two antibiotics, actinorhodin (Act) and undecylprodigiosin (Red), whereas a deletion mutant of scbR also failed to make g-butyrolactones and showed delayed Red production. These phenotypes differ markedly from those expected by analogy with the S. griseus A-factor system. Furthermore, transcription of scbR increased, and that of scbA was abolished, in an scbR mutant, indicating that ScbR represses its own expression while activating that of scbA. In the scbA mutant, expression of both genes was greatl

Year: 2013
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