IUBMB Enzyme Nomenclature


Accepted name: maltose O-acetyltransferase

Reaction: acetyl-CoA + maltose = CoA + 6-O-acetyl-α-D-glucopyranosyl-(1→4)-D-glucose

Other name(s): maltose transacetylase; maltose O-acetyltransferase; MAT

Systematic name: acetyl-CoA:maltose O-acetyltransferase

Comments: Not identical with EC galactoside O-acetyltransferase. The acetyl group is added exclusively to the C6 position of glucose and to the C6 position of the non-reducing glucose residue of maltose [3]. Other substrates of this enzyme are glucose, which is a better substrate than maltose [2], and mannose and frucose, which are poorer substrates than maltose [2]. Isopropyl-β-thio-galactose, which is a good substrate for EC is a poor substrate for this enzyme [3].

Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, PDB, CAS registry number: 81295-47-8


1. Freundlieb, S. and Boos, W. Maltose transacetylase of Escherichia coli: a preliminary report. Ann. Microbiol. (Paris) 133A (1982) 181-189. [PMID: 7041741]

2. Brand, B. and Boos, W. Maltose transacetylase of Escherichia coli. Mapping and cloning of its structural, gene, mac, and characterization of the enzyme as a dimer of identical polypeptides with a molecular weight of 20,000. J. Biol. Chem. 266 (1991) 14113-14118. [PMID: 1856235]

3. Lo Leggio, L., Dal Degan, F., Poulsen, P., Andersen, S.M. and Larsen, S. The structure and specificity of Escherichia coli maltose acetyltransferase give new insight into the LacA family of acyltransferases. Biochemistry 42 (2003) 5225-5235. [PMID: 12731863]

[EC created 1984]

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