title: Cloning, sequencing, and analysis of the griseusin polyketide synthase gene cluster from Streptomyces griseus.
abstract: A fragment of DNA was cloned from the Streptomyces griseus K-63 genome by using genes (act) for the actinorhodin polyketide synthase (PKS) of Streptomyces coelicolor as a probe. Sequencing of a 5.4-kb segment of the cloned DNA revealed a set of five gris open reading frames (ORFs), corresponding to the act PKS genes, in the following order: ORF1 for a ketosynthase, ORF2 for a chain length-determining factor, ORF3 for an acyl carrier protein, ORF5 for a ketoreductase, and ORF4 for a cyclase-dehydrase. Replacement of the gris genes with a marker gene in the S. griseus genome by using a single-stranded suicide vector propagated in Escherichia coli resulted in loss of the ability to produce griseusins A and B, showing that the five gris genes do indeed encode the type II griseusin PKS. These genes, encoding a PKS that is programmed differently from those for other aromatic PKSs so far available, will provide further valuable material for analysis of the programming mechanism by the construction and analysis of strains carrying hybrid PKS.
authors.affiliation: John Innes Institute, John Innes Centre, Norwich, United Kingdom.
authors.forename: T W
authors.initials: TW
authors.lastname: Yu
authors.forename: M J
authors.initials: MJ
authors.lastname: Bibb
authors.forename: W P
authors.initials: WP
authors.lastname: Revill
authors.forename: D A
authors.initials: DA
authors.lastname: Hopwood
mesh_terms: D000595:Amino Acid Sequence; D000880:Anthraquinones / Q000378:metabolism; D000900:Anti-Bacterial Agents / Q000096:biosynthesis; D001483:Base Sequence; D003001:Cloning, Molecular; D005798:Genes, Bacterial / Q000235:genetics*; D008969:Molecular Sequence Data; D009097:Multienzyme Complexes / Q000145:classification / Q000235:genetics*; D005810:Multigene Family / Q000235:genetics*; D016254:Mutagenesis, Insertional; D009285:Naphthoquinones / Q000378:metabolism; D017422:Sequence Analysis, DNA; D017386:Sequence Homology, Amino Acid; D013305:Streptomyces griseus / Q000235:genetics*; D000095622:Benzoisochromanequinones
chemical_list: D000880:Anthraquinones; D000900:Anti-Bacterial Agents; D009097:Multienzyme Complexes; D009285:Naphthoquinones; C012339:griseusin; C013390:actinorhodin; D000095622:Benzoisochromanequinones