The function of NAT8 (N-acetyltransferase 8 (putative), Ensembl gene identifier ENSG00000144035) is as follows. Endoplasmic reticulum (ER)-membrane-bound lysine N- acetyltransferase catalyzing the N6-acetylation of lysine residues in the lumen of the ER in various proteins, including PROM1 and BACE1, using acetyl-CoA as acetyl donor (PubMed:19011241, PubMed:22267734, PubMed:24556617, PubMed:31945187). Thereby, may regulate apoptosis through the acetylation and the regulation of the expression of PROM1 (PubMed:24556617). May also regulate amyloid beta-peptide secretion through acetylation of BACE1 and the regulation of its expression in neurons (PubMed:19011241). N(6)-lysine acetylation in the ER maintains protein homeostasis and regulates reticulophagy (By similarity). Alternatively, acetylates the free alpha-amino group of cysteine S- conjugates to form mercapturic acids (PubMed:20392701). This is the final step in a major route for detoxification of a wide variety of reactive electrophiles which starts with their incorporation into glutathione S-conjugates. The glutathione S-conjugates are then further processed into cysteine S-conjugates and finally mercapturic acids which are water soluble and can be readily excreted in urine or bile. {ECO:0000250|UniProtKB:Q9JIY7, ECO:0000269|PubMed:19011241, ECO:0000269|PubMed:20392701, ECO:0000269|PubMed:22267734, ECO:0000269|PubMed:24556617, ECO:0000269|PubMed:31945187}.