D2023.4 encodes a thialysine N-(epsilon)-acetyltransferase, belonging to the GCN5-related N-acetyltransferase superfamily; recombinant D2023.4 protein forms a catalytically active homodimer, most efficiently catalysing the N-acetylation of thialysine [S-(2-aminoethyl)-L-cysteine], O-(2-aminoethyl)-L-serine andS-(2-aminoethyl)-D,L-homocysteine.
Enables N-acetyltransferase activity. Is an ortholog of human SAT1 (spermidine/spermine N1-acetyltransferase 1) and SAT2 (spermidine/spermine N1-acetyltransferase family member 2).