Thioethanolamine S-acetyltransferase () is an enzyme that catalyzes the chemical reaction

The two substrates of this enzyme are cysteamine and acetyl-CoA. Its products are S-acetylcysteamine and coenzyme A.

This enzyme belongs to the family of transferases, specifically those acyltransferases transferring groups other than aminoacyl groups. The systematic name of this enzyme class is acetyl-CoA:2-aminoethanethiol S-acetyltransferase. Other names in common use include thioltransacetylase B, thioethanolamine acetyltransferase, and acetyl-CoA:thioethanolamine S-acetyltransferase.

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