Escherichia coli K-12 substr. MG1655 Reaction:

Superclasses: Reactions Classified By Conversion TypeSimple ReactionsChemical Reactions
Reactions Classified By SubstrateSmall-Molecule Reactions

EC Number:

Enzymes and Genes:
maltose O-acetyltransferaseInferred from experiment: maa

The direction shown, i.e. which substrates are on the left and right sides, is in accordance with the Enzyme Commission system.

Mass balance status: Balanced.

Enzyme Commission Primary Name: maltose O-acetyltransferase

Enzyme Commission Synonyms: maltose transacetylase, maltose O-acetyltransferase, MAT

This reaction acetylates free sugars in the cell, perhaps playing a detoxifying role.

Enzyme Commission Summary:
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 [Lo03]. Other substrates of this enzyme are glucose, which is a better substrate than maltose [Brand91], and mannose and frucose, which are poorer substrates than maltose [Brand91]. Isopropyl-β-thio-galactose, which is a good substrate for EC is a poor substrate for this enzyme [Lo03].

Citations: [Freundlieb82 ]

Gene-Reaction Schematic

Gene-Reaction Schematic

Relationship Links: BRENDA:EC:, ENZYME:EC:, IUBMB-ExplorEnz:EC:


Brand91: Brand B, Boos W (1991). "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 1991;266(21);14113-8. PMID: 1856235

Freundlieb82: Freundlieb S, Boos W (1982). "Maltose transacetylase of Escherichia coli: a preliminary report." Ann Microbiol (Paris) 1982;133A(1);181-9. PMID: 7041741

Lo03: Lo Leggio L, Dal Degan F, Poulsen P, Andersen SM, Larsen S (2003). "The structure and specificity of Escherichia coli maltose acetyltransferase give new insight into the LacA family of acyltransferases." Biochemistry 42(18);5225-35. PMID: 12731863

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Please cite the following article in publications resulting from the use of EcoCyc: Nucleic Acids Research 41:D605-12 2013
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