Beta-galactoside transacetylase

GAT in complex with CoA and two molecules/active site of IPTG viewed perpendicular to the molecular threefold axis of the enzyme

β-galactoside transacetylase is an enzyme that transfers an acetyl group from acetyl-CoA to β-galactosides, and is coded by a gene (lacA) in the lac operon of E. coli.^[1] Its precise function as part of the lac operon is not understood currently.^[2]

The kinetics of the enzyme were delineated in 1995.^[3]

The enzyme's cellular role may be to detoxify non-metabolizable pyranosides by acetylating them and preventing their reentry into the cell.^[4]

References

↑ Wang XG; Olsen LR; Roderick SL. (April 2002). "Structure of the lac operon galactoside acetyltransferase". Structure. 10 (4): 581–8. doi:10.1016/S0969-2126(02)00741-4. PMID 11937062.
↑ Roderick SL. (June 2005). "The lac operon galactoside acetyltransferase". C R Biol. 328 (6): 568–75. doi:10.1016/j.crvi.2005.03.005. PMID 15950163.
↑ A. Lewendon; J. Ellis; W.V. Shaw (1995). "Structural and Mechanistic Studies of Galactoside Acetyltransferase, the Escherichia coli LacA Gene Product". J. Biol. Chem. 270 (44): 26326–31. doi:10.1074/jbc.270.44.26326. PMID 7592843.
↑ Wang, XG; Olsen, LR; Roderick, SL (2002). "Structure of the lac operon galactoside acetyltransferase". Structure. 10 (4): 581–8. doi:10.1016/S0969-2126(02)00741-4. PMID 11937062.

Transferases: acyltransferases (EC 2.3)

2.3.1: other than amino-acyl groups	acetyltransferases: Acetyl-Coenzyme A acetyltransferase N-Acetylglutamate synthase Choline acetyltransferase Dihydrolipoyl transacetylase Acetyl-CoA C-acyltransferase Beta-galactoside transacetylase Chloramphenicol acetyltransferase N-acetyltransferase Serotonin N-acetyl transferase HGSNAT ARD1A Histone acetyltransferase P300/CBP NAT2 palmitoyltransferases: Carnitine O-palmitoyltransferase CPT1 CPT2 Serine C-palmitoyltransferase SPTLC1 SPTLC2 other: Acyltransferase like 2 Aminolevulinic acid synthase Beta-ketoacyl-ACP synthase Glyceronephosphate O-acyltransferase Lecithin—cholesterol acyltransferase Glycerol-3-phosphate O-acyltransferase 1-acylglycerol-3-phosphate O-acyltransferase 2-acylglycerol-3-phosphate O-acyltransferase ABHD5

2.3.2: Aminoacyltransferases	Gamma-glutamyl transpeptidase Peptidyl transferase Transglutaminase Tissue transglutaminase Keratinocyte transglutaminase Factor XIII

2.3.3: converted into alkyl on transfer	Citrate synthase ATP citrate lyase HMG-CoA synthase Malate synthase

Enzymes

Activity	Active site Binding site Catalytic triad Oxyanion hole Enzyme promiscuity Catalytically perfect enzyme Coenzyme Cofactor Enzyme catalysis Enzyme kinetics Lineweaver–Burk plot Michaelis–Menten kinetics

Regulation	Allosteric regulation Cooperativity Enzyme inhibitor

Classification	EC number Enzyme superfamily Enzyme family List of enzymes

Types	EC1 Oxidoreductases (list) EC2 Transferases (list) EC3 Hydrolases (list) EC4 Lyases (list) EC5 Isomerases (list) EC6 Ligases (list)

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