title: A polyketide biosynthetic gene cluster from Streptomyces antibioticus includes a LysR-type transcriptional regulator.
abstract: In the search for Type II polyketide synthases (PKSs) a DNA fragment was isolated from Streptomyces antibioticus ATCC 11891 (a producer of oleandomycin). DNA sequencing of the cloned fragment revealed six complete ORFs whose deduced products showed similarities to those of other genes known to be involved in polyketide biosynthesis. Several S. coelicolor strains mutated in different steps of actinorhodin biosynthesis (actI, actIII, actV(A) and actVII) were complemented by the cloned genes, suggesting that the isolated genes encode an aromatic polyketide of unknown structure and function. The cluster also contains a putative LysR-type transcriptional regulator (ORF0), which controls PKS gene expression in a heterologous host. DNA binding assays and transcriptional analysis suggest that the pathway-specific regulator for actinorhodin biosynthesis (actII-ORF4) is also involved in the expression of the cloned PKS in the host strain.
authors.affiliation: Centro Nacional de Biotecnologia, Campus de la Universidad Autónoma de Madrid, 28049 Cantoblanco, Madrid, Spain.
authors.forename: V
authors.initials: V
authors.lastname: Colombo
authors.forename: M
authors.initials: M
authors.lastname: Fernández-de-Heredia
authors.forename: F
authors.initials: F
authors.lastname: Malpartida
mesh_terms: D000880:Anthraquinones / Q000378:metabolism; D000900:Anti-Bacterial Agents / Q000096:biosynthesis*; D001426:Bacterial Proteins / Q000235:genetics / Q000378:metabolism; D001483:Base Sequence; D003001:Cloning, Molecular; D018983:DNA Footprinting; D004269:DNA, Bacterial; D015964:Gene Expression Regulation, Bacterial; D005816:Genetic Complementation Test; D008969:Molecular Sequence Data; D009097:Multienzyme Complexes / Q000235:genetics* / Q000378:metabolism; D005810:Multigene Family; D016366:Open Reading Frames; D010957:Plasmids; D011401:Promoter Regions, Genetic; D017422:Sequence Analysis, DNA; D013302:Streptomyces / Q000201:enzymology / Q000235:genetics* / Q000378:metabolism; D014157:Transcription Factors / Q000235:genetics / Q000378:metabolism; D014158:Transcription, Genetic; D000095622:Benzoisochromanequinones
chemical_list: D000880:Anthraquinones; D000900:Anti-Bacterial Agents; D001426:Bacterial Proteins; D004269:DNA, Bacterial; D009097:Multienzyme Complexes; D014157:Transcription Factors; C073470:LysR protein, Bacteria; C013390:actinorhodin; D000095622:Benzoisochromanequinones