PKS_KS

Beta-ketoacyl synthase
PKS_KS
SMART accession number:SM00825
Description: The structure of beta-ketoacyl synthase is similar to that of the thiolase family and also chalcone synthase. The active site of beta-ketoacyl synthase is located between the N and C-terminal domains.
Interpro abstract (IPR020841):

Beta-ketoacyl-ACP synthase EC 2.3.1.41 (KAS) [(PUBMED:3076376)] is the enzyme that catalyzes the condensation of malonyl-ACP with the growing fatty acid chain. It is found as a component of a number of enzymatic systems, including fatty acid synthetase (FAS), which catalyzes the formation of long-chain fatty acids from acetyl-CoA, malonyl-CoA and NADPH; the multi-functional 6-methysalicylic acid synthase (MSAS) from Penicillium patulum [(PUBMED:2209605)], which is involved in the biosynthesis of a polyketide antibiotic; polyketide antibiotic synthase enzyme systems; Emericella nidulans multifunctional protein Wa, which is involved in the biosynthesis of conidial green pigment; Rhizobium nodulation protein nodE, which probably acts as a beta-ketoacyl synthase in the synthesis of the nodulation Nod factor fatty acyl chain; and yeast mitochondrial protein CEM1. The condensation reaction is a two step process, first the acyl component of an activated acyl primer is transferred to a cysteine residue of the enzyme and is then condensed with an activated malonyl donor with the concomitant release of carbon dioxide.

This entry represents the the beta-ketoacyl synthase region from a number of polyketide synthases including erythronolide synthase and the lovastatin nonaketide chain synthase.
Family alignment:
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There are 3557 PKS_KS domains in 2153 proteins in SMART's nrdb database.

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