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. 1983 Sep;155(3):1238–1248. doi: 10.1128/jb.155.3.1238-1248.1983

Cloning of a pleiotropic gene that positively controls biosynthesis of A-factor, actinorhodin, and prodigiosin in Streptomyces coelicolor A3(2) and Streptomyces lividans.

S Horinouchi, O Hara, T Beppu
PMCID: PMC217821  PMID: 6309746

Abstract

A-factor (2S-isocapryloyl-3S-hydroxymethyl-gamma-butyrolactone), an autoregulating factor originally found in Streptomyces griseus, is involved in streptomycin biosynthesis and cell differentiation in this organism. A-factor production is widely distributed among actinomycetes, including Streptomyces coelicolor A3(2) and Streptomyces lividans. A chromosomal pleiotropic regulatory gene of S. coelicolor A3(2) controlling biosynthesis of A-factor and red pigments was cloned with a spontaneous A-factor-deficient strain of S. lividans HH21 and plasmid pIJ41 as a host-vector system. The restriction endonuclease KpnI-digested chromosomal fragments were ligated into the plasmid vector and introduced by transformation into the protoplasts of strain HH21. Three red transformants thus selected were found to produce A-factor and to carry a plasmid with the same molecular weight, and a 6.4-megadalton fragment was inserted in the KpnI site of pIJ41. By restriction endonuclease mapping and subcloning, a restriction fragment (1.2 megadaltons, approximately 2,000 base pairs) bearing the gene which causes concomitant production of A-factor and red pigments was determined. The red pigments were identified by thin-layer chromatography and spectroscopy to be actinorhodin and prodigiosin, both of which are the antibiotics produced by S. coelicolor A3(2). The cloned fragment was introduced into the A-factor-negative mutants (afs) of S. coelicolor A3(2) by using pIJ702 as the vector, where it complemented one of these mutations, afsB, characterized by simultaneous loss of A-factor and red pigment production. We conclude that the cloned gene pleiotropically and positively controls the biosynthesis of A-factor, actinorhodin, and prodigiosin.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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