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EC 2.3.1.39 Details
EC number
2.3.1.39
Accepted name
[acyl-carrier-protein] S-malonyltransferase
Reaction
malonyl-CoA + an [acyl-carrier protein] = CoA + a malonyl-[acyl-carrier protein]
Other name(s)
[acyl carrier protein]malonyltransferase, FabD, malonyl coenzyme A-acyl carrier protein transacylase, malonyl transacylase, malonyl transferase, malonyl-CoA-acyl carrier protein transacylase, malonyl-CoA:[acyl-carrier-protein] S-malonyltransferase, malonyl-CoA:ACP transacylase, malonyl-CoA:ACP-SH transacylase, malonyl-CoA:AcpM transacylase, malonyl-CoA:acyl carrier protein transacylase, malonyl-CoA:acyl-carrier-protein transacylase, malonyl-CoA/dephospho-CoA acyltransferase, MAT, MCAT, MdcH
Systematic name
malonyl-CoA:[acyl-carrier protein] S-malonyltransferase
CAS registry number
37257-17-3
Comment
This enzyme, along with EC 2.3.1.38, [acyl-carrier-protein] S-acetyltransferase, is essential for the initiation of fatty-acid biosynthesis in bacteria. This enzyme also provides the malonyl groups for polyketide biosynthesis [7]. The product of the reaction, malonyl-ACP, is an elongation substrate in fatty-acid biosynthesis. In Mycobacterium tuberculosis, holo-ACP (the product of EC 2.7.8.7, holo-[acyl-carrier-protein] synthase) is the preferred substrate [5]. This enzyme also forms part of the multienzyme complexes EC 4.1.1.88, biotin-independent malonate decarboxylase and EC 7.2.4.4, biotin-dependent malonate decarboxylase. Malonylation of ACP is immediately followed by decarboxylation within the malonate-decarboxylase complex to yield acetyl-ACP, the catalytically active species of the decarboxylase [12]. In the enzyme from Klebsiella pneumoniae, methylmalonyl-CoA can also act as a substrate but acetyl-CoA cannot [10] whereas the enzyme from Pseudomonas putida can use both as substrates [11]. The ACP subunit found in fatty-acid biosynthesis contains a pantetheine-4′-phosphate prosthetic group; that from malonate decarboxylase also contains pantetheine-4′-phosphate but in the form of a 2′-(5-triphosphoribosyl)-3′-dephospho-CoA prosthetic group.
History
created 1972, modified 2006, modified 2008
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