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Information on EC 2.3.1.289 - aureothin polyketide synthase system

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IUBMB Comments
This polyketide synthase, characterized from the bacterium Streptomyces thioluteus, generates the backbone of the antibiotic aureothin. It is composed of 4 modules that total 18 domains and is encoded by three genes. The enzyme accepts the unusual starter unit 4-nitrobenzoyl-CoA and extends it by 4 molecules of (S)-methylmalonyl-CoA and a single molecule of malonyl-CoA. The first module (encoded by aurA) is used twice in an iterative fashion, so that the five Claisen condensation reactions are catalysed by only four modules. The iteration becomes possible by the transfer of the [acp]-bound polyketide intermediate back to the ketosynthase (KS) domain on the opposite polyketide synthase strand (polyketides are homodimeric).
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The expected taxonomic range for this enzyme is: Streptomyces thioluteus
Synonyms
aurABC, aureothin polyketide synthase complex, more
REACTION
REACTION DIAGRAM
COMMENTARY hide
ORGANISM
UNIPROT
LITERATURE
4-nitrobenzoyl-CoA + malonyl-CoA + 4 (S)-methylmalonyl-CoA + 4 NADPH + 4 H+ = demethylluteothin + 5 CO2 + 6 CoA + 4 NADP+ + 3 H2O
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