The Enzyme Database

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Accepted name: [acyl-carrier-protein] S-malonyltransferase
Reaction: malonyl-CoA + an [acyl-carrier protein] = CoA + a malonyl-[acyl-carrier protein]
For diagram of malonate decarboxylase, click here
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
Comments: This enzyme, along with EC, [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, holo-[acyl-carrier-protein] synthase) is the preferred substrate [5]. This enzyme also forms part of the multienzyme complexes EC, biotin-independent malonate decarboxylase and EC, 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 cofactor; that from malonate decarboxylase also contains pantetheine-4′-phosphate but in the form of a 2′-(5-triphosphoribosyl)-3′-dephospho-CoA cofactor.
Links to other databases: BRENDA, EXPASY, GTD, KEGG, MetaCyc, PDB, CAS registry number: 37257-17-3
1.  Alberts, A.W., Majerus, P.W. and Vagelos, P.R. Acetyl-CoA acyl carrier protein transacylase. Methods Enzymol. 14 (1969) 50–53. [DOI]
2.  Prescott, D.J. and Vagelos, P.R. Acyl carrier protein. Adv. Enzymol. Relat. Areas Mol. Biol. 36 (1972) 269–311. [DOI] [PMID: 4561013]
3.  Williamson, I.P. and Wakil, S.J. Studies on the mechanism of fatty acid synthesis. XVII. Preparation and general properties of acetyl coenzyme A and malonyl coenzyme A-acyl carrier protein transacylases. J. Biol. Chem. 241 (1966) 2326–2332. [DOI] [PMID: 5330116]
4.  Joshi, V.C. and Wakil, S.J. Studies on the mechanism of fatty acid synthesis. XXVI. Purification and properties of malonyl-coenzyme A--acyl carrier protein transacylase of Escherichia coli. Arch. Biochem. Biophys. 143 (1971) 493–505. [DOI] [PMID: 4934182]
5.  Kremer, L., Nampoothiri, K.M., Lesjean, S., Dover, L.G., Graham, S., Betts, J., Brennan, P.J., Minnikin, D.E., Locht, C. and Besra, G.S. Biochemical characterization of acyl carrier protein (AcpM) and malonyl-CoA:AcpM transacylase (mtFabD), two major components of Mycobacterium tuberculosis fatty acid synthase II. J. Biol. Chem. 276 (2001) 27967–27974. [DOI] [PMID: 11373295]
6.  Keatinge-Clay, A.T., Shelat, A.A., Savage, D.F., Tsai, S.C., Miercke, L.J., O'Connell, J.D., 3rd, Khosla, C. and Stroud, R.M. Catalysis, specificity, and ACP docking site of Streptomyces coelicolor malonyl-CoA:ACP transacylase. Structure 11 (2003) 147–154. [DOI] [PMID: 12575934]
7.  Szafranska, A.E., Hitchman, T.S., Cox, R.J., Crosby, J. and Simpson, T.J. Kinetic and mechanistic analysis of the malonyl CoA:ACP transacylase from Streptomyces coelicolor indicates a single catalytically competent serine nucleophile at the active site. Biochemistry 41 (2002) 1421–1427. [DOI] [PMID: 11814333]
8.  Hoenke, S., Schmid, M. and Dimroth, P. Sequence of a gene cluster from Klebsiella pneumoniae encoding malonate decarboxylase and expression of the enzyme in Escherichia coli. Eur. J. Biochem. 246 (1997) 530–538. [DOI] [PMID: 9208947]
9.  Koo, J.H. and Kim, Y.S. Functional evaluation of the genes involved in malonate decarboxylation by Acinetobacter calcoaceticus. Eur. J. Biochem. 266 (1999) 683–690. [DOI] [PMID: 10561613]
10.  Hoenke, S. and Dimroth, P. Formation of catalytically active acetyl-S-malonate decarboxylase requires malonyl-coenzyme A:acyl carrier protein transacylase as auxiliary enzyme. Eur. J. Biochem. 259 (1999) 181–187. [DOI] [PMID: 9914491]
11.  Chohnan, S., Fujio, T., Takaki, T., Yonekura, M., Nishihara, H. and Takamura, Y. Malonate decarboxylase of Pseudomonas putida is composed of five subunits. FEMS Microbiol. Lett. 169 (1998) 37–43. [DOI] [PMID: 9851033]
12.  Dimroth, P. and Hilbi, H. Enzymic and genetic basis for bacterial growth on malonate. Mol. Microbiol. 25 (1997) 3–10. [DOI] [PMID: 11902724]
[EC created 1972, modified 2006, modified 2008]

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