Hybridization and DNA sequence analyses suggest an early evolutionary divergence of related biosynthetic gene sets encoding polyketide antibiotics and spore pigments in Streptomyces spp
The whiE gene cluster of Streptomyces coelicolor, which is related to gene sets encoding the biosynthesis of polycyclic aromatic polyketide antibiotics, determines a spore pigment. Southern blotting using probes from three different parts of the whiE cluster revealed related gene sets in about half...
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Veröffentlicht in: | Gene 1993-08, Vol.130 (1), p.107-116 |
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Sprache: | eng |
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Zusammenfassung: | The
whiE gene cluster of
Streptomyces coelicolor, which is related to gene sets encoding the biosynthesis of polycyclic aromatic polyketide antibiotics, determines a spore pigment. Southern blotting using probes from three different parts of the
whiE cluster revealed related gene sets in about half of a collection of diverse
Streptomyces strains. A 5.2-kb segment of one such cluster,
sch, previously shown to determine spore pigmentation in
Streptomyces halstedii, was sequenced. Seven open reading frames (ORFs), two of them incomplete, were found. Six of the ORFs resemble the known part of the
whiE cluster closely. The derived gene products include a ketosynthase (= condensing enzyme) pair, acyl carrier protein and cyclase, as well as two of unidentified function. The seventh ORF diverges from the main cluster and encodes a protein that resembles a dichlorophenol hydroxylase. Comparison with sequences of related gene sets for the biosynthesis of antibiotics suggests that gene clusters destined to specify pigment production diverged from those destined to specify antibiotics early in the evolution of the
Streptomyces genus. |
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ISSN: | 0378-1119 1879-0038 |
DOI: | 10.1016/0378-1119(93)90352-4 |