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EC 2.3.1.301 Details
EC number
2.3.1.301
Accepted name
mycobacterial β-ketoacyl-[acyl carrier protein] synthase III
Reaction
dodecanoyl-CoA + a malonyl-[acyl-carrier protein] = a 3-oxotetradecanoyl-[acyl-carrier protein] + CoA + CO2
Other name(s)
fabH (gene name) (ambiguous), mycobacterial 3-oxoacyl-[acyl carrier protein] synthase III
Systematic name
dodecanoyl-CoA:malonyl-[acyl-carrier protein] C-acyltransferase
Comment
The enzyme, characterized from mycobacteria, provides a link between the type I and type II fatty acid synthase systems (FAS-I and FAS-II, respectively) found in these organisms. The enzyme acts on medium- and long-chain acyl-CoAs (C12-C16) produced by the FAS-I system, condensing them with malonyl-[acyl-carrier protein] (malonyl-AcpM) and forming starter molecules for the FAS-II system, which elongates them into meromycolic acids. The enzyme has no activity with short-chain acyl-CoAs (e.g. acetyl-CoA), which are used by EC 2.3.1.180, β-ketoacyl-[acyl-carrier-protein] synthase III, or branched-chain acyl-CoAs, which are used by EC 2.3.1.300, branched-chain β-ketoacyl-[acyl-carrier-protein] synthase.
History
created 2021
EC Tree
2.3.1.55 created 1976, deleted 1999
2.3.1.120 created 1990, deleted 1992
2.3.1.124 created 1990, deleted 1992