title: Type II thioesterase ScoT is required for coelimycin production by the modular polyketide synthase Cpk of Streptomyces coelicolor A3(2).
abstract: Type II thioesterases were shown to maintain efficiency of modular type I polyketide synthases and nonribosomal peptide synthetases by removing acyl residues blocking extension modules. We found that thioesterase ScoT from Streptomyces coelicolor A3(2) is required for the production of the yellow-pigmented coelimycin by the modular polyketide synthase Cpk. No production of coelimycin was observed in cultures of scoT disruption mutant. Polyketide production was restored upon complementation with an intact copy of the scoT gene. An enzymatic assay showed that ScoT thioesterase can hydrolyse a 12-carbon acyl chain but the activity is too low to play a role in product release from the polyketide synthase. We conclude that ScoT is an editing enzyme necessary to maintain the activity of polyketide synthase Cpk. We provide a HPLC based method to measure the amount of coelimycin P2 in a culture medium.
authors.affiliation: Ludwik Hirszfeld Institute of Immunology and Experimental Therapy, Polish Academy of Sciences, Wroclaw, Poland.
authors.forename: Magdalena
authors.initials: M
authors.lastname: Kotowska
authors.affiliation: Ludwik Hirszfeld Institute of Immunology and Experimental Therapy, Polish Academy of Sciences, Wroclaw, Poland.
authors.forename: Jarosław
authors.initials: J
authors.lastname: Ciekot
authors.affiliation: Ludwik Hirszfeld Institute of Immunology and Experimental Therapy, Polish Academy of Sciences, Wroclaw, Poland and Department of Toxicology, Wroclaw Medical University, Wroclaw, Poland.
authors.forename: Krzysztof
authors.initials: K
authors.lastname: Pawlik
mesh_terms: D000595:Amino Acid Sequence; D064429:Fatty Acid Synthases / Q000235:genetics / Q000378:metabolism*; D015964:Gene Expression Regulation, Bacterial; D048630:Polyketide Synthases / Q000378:metabolism*; D048372:Streptomyces coelicolor / Q000201:enzymology*; D013379:Substrate Specificity; D013869:Thiolester Hydrolases / Q000235:genetics / Q000378:metabolism*
chemical_list: D048630:Polyketide Synthases; D064429:Fatty Acid Synthases; D013869:Thiolester Hydrolases; C022738:thioesterase II