Aklanonic acid methyl ester cyclase AcmA

UniProtKB accession:  O52646

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UniProtKB description:  Involved in the biosynthesis of aklavinone which is an important precursor common to the formation of the clinically significant anthracyclines such as carminomycin, daunorubicin (daunomycin), rhodomycin, aclacinomycin T (aklavin) and aclacinomycin A (aclarubicin). These compounds are aromatic polyketide antibiotics that exhibit high cytotoxicity and are widely applied in the chemotherapy of a variety of cancers. Catalyzes the cyclization of aklanonic acid methyl ester to yield aklaviketone. It is also able to use nogalonic acid methyl ester as substrate, but produces exclusively auraviketone with C9-R stereochemistry.