Virginiae butanolide binding protein from Streptomyces virginiae. Evidence that VbrA is not the virginiae butanolide binding protein and reidentification of the true binding protein

Virginiae butanolides (VBs) A-E are butyrolactone autoregulators that control virginiamycin production in Streptomyces virginiae. We have previously reported the purification and molecular cloning of VbrA, a putative VB binding protein (Okamoto, S., Nihira, T., Kataoka, H., Suzuki, A., and Yamada, Y...

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Bibliographic Details
Published in:The Journal of biological chemistry 1995-05, Vol.270 (20), p.12319-12326
Main Authors: Okamoto, S, Nakamura, K, Nihira, T, Yamada, Y
Format: Article
Language:English
Subjects:
4-Butyrolactone - analogs & derivatives
4-Butyrolactone - metabolism
Amino Acid Sequence
Bacterial Proteins - genetics
Base Sequence
Chromatography, Affinity
Chromatography, Gel
Chromatography, Ion Exchange
Cloning, Molecular
Escherichia coli
Genes, Bacterial
Molecular Sequence Data
Molecular Weight
Protein Binding
Receptors, Cytoplasmic and Nuclear - genetics
Receptors, Cytoplasmic and Nuclear - isolation & purification
Recombinant Fusion Proteins - metabolism
Streptomyces - genetics
Streptomyces - metabolism
Streptomyces virginiae
Transcription Factors
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Summary:Virginiae butanolides (VBs) A-E are butyrolactone autoregulators that control virginiamycin production in Streptomyces virginiae. We have previously reported the purification and molecular cloning of VbrA, a putative VB binding protein (Okamoto, S., Nihira, T., Kataoka, H., Suzuki, A., and Yamada, Y. (1992) J. Biol. Chem. 267, 1093-1098). However, VbrA protein overexpressed in Escherichia coli did not show any detectable VB binding activity nor did the immunoprecipitation of native VbrA from a cell-free extract of S. virginiae cause any decrease in such activity, indicating that VbrA is not the true VB binding protein. This finding prompted us to seek the true VB binding protein by repurification. After successive purification by anion exchange, gel filtration, heparin, and hydrophobic interaction chromatography, a 26-kDa protein (p26k) was identified as the true VB binding protein. Partial amino acid sequences of p26k were determined, and the gene (barA) that encodes this protein was isolated and cloned using degenerate oligonucleotide probes. When the barA gene was expressed in Streptomyces lividans and E. coli, strong VB binding activity appeared, demonstrating unambiguously that the S. virginiae p26k protein is the true VB binding protein.
ISSN:0021-9258
DOI:10.1074/jbc.270.20.12319