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A gene encoding a γ-butyrolactone autoregulatorreceptor was cloned from , andthe biochemical characteristics, including the autoregulatorspecificity, were determined with the purified recombinantprotein. Using primers designed for the conserved aminoacid sequence of Streptomyces γ-butyrolactone autoregulatorreceptors, a 120 bp S. erythraea DNA fragment was obtainedby PCR. Southern and colony hybridization with the 120 bpfragment as a probe allowed to select a genomic clone of S.erythraeasequencing analysis revealed a 615 bp open reading frame(ORF), showing moderate homology (identity, 31-34%;similarity, 45-47%) with the γ-butyrolactone autoregulatorreceptors from Streptomyces sp., and this ORF was namedseaR (Saccharopolyspora erythraea autoregulator receptor).The seaRrecombinant SeaR protein (rSeaR) in Escherichia coli, andthe rSeaR protein was purified to homogeneity by DEAE-Sephacel column chromatography, folowed by DEAE-ion-exchange HPLC. The molecular mas of the purified rSeaRprotein was 52 kDa by HPLC gel-filtration chromatographyand 27 kDa by SDS-polyacrylamide gel electrophoresis,indicating that the rSeaR protein is present as a dimer. Abinding assay with tritium-labeled autoregulators revealedthat rSeaR has clear binding activity with a VB-C-typethe first time that the erythromycin producer S. erythraeapossesses a gene for the γ-butyrolactone autoregulator receptor.

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