β-galactoside transacetylase is an enzyme that transfers an acetyl group from acetyl-CoA to galactosides, glucosides and lactosides but not to the beta-galactosidase which is coded by lacZ in the lac operon of E. coli. The galactosidase acetyltransferase of the classical E.coli lac operon is an enzyme whose biological role remain unclear.  Its precise function as part of the lac operon is not understood currently.
The kinetics of the enzyme were delineated in 1995.
The enzyme's cellular role may be to detoxify non-metabolizable pyranosides by acetylating them and preventing their reentry into the cell.
- 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.
- galactoside acetyltransferase at the US National Library of Medicine Medical Subject Headings (MeSH)
- EC 22.214.171.124
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