title: Topological aspects of microsomal N-acetyltransferase, an enzyme responsible for the acetylation of cysteine S-conjugates of xenobiotics.
abstract: Acetylation of cysteine S-conjugates of xenobiotics by microsomal N-acetyltransferase is the final step of detoxicative metabolism leading to mercapturic acid biosynthesis. To elucidate the subcellular site of N-acetylation and the effective mechanism by which the final metabolites are eliminated from the organisms, topological aspects and catalytic properties of microsomal N-acetyltransferase and mercapturic acid biosynthesis in vivo were investigated. Intravenous administration of radioactive S-benzyl-L-cysteine, a model compound of cysteine S-conjugates, resulted in rapid acetylation of the conjugate in liver and kidney to a similar extent. The acetylation was followed by a rapid excretion of the metabolite, a mercapturic acid, into the urine; about 60% of the injected dose appeared in urine within 60 min of administration. Limited proteolysis of microsomal vesicles obtained from liver and kidney by chymotrypsin or trypsin inactivated the transferase by 49-62% and 62-73%, respectively. Proteolytic inactivation of the transferase was not significantly affected by the presence of 0.04% sodium deoxycholate by which the vesicles became permeable to macromolecules due to its detergent action. To determine the sidedness of the active site of N-acetyltransferase on the microsomal membranes, two S-acetyldextran polymer derivatives (Mr 500 000) of cysteine and N-acetylcysteine which represent an nonpermeant substrate and product for this enzyme, respectively, were examined for their effects on the vesicle-associated enzyme activity. Both derivatives inhibited the transferase activity in a dose-dependent fashion; maximum inhibition of the enzyme activity was 40% by the former and 60% by the latter. Sulfobromophthalein strongly inhibited the enzyme activity and this inhibition was completely reversed by adding an equimolar amount of hepatic glutathione S-transferases (ligandins). In contrast to the strong inhibition by sulfobromophthalein itself, its glutathione S-conjugate did not inhibit the enzyme activity. These results indicate that the active site and the protease-sensitive domain(s) of the microsomal N-acetyltransferase are localized on the outer surface (cytoplasmic side) of endoplasmic reticulum and that the ligandin(s) might protect membranous N-acetyltransferase from inhibition by organic anions by binding them and catalyzing the conjugation with glutathione.
mesh_terms: D000107:Acetylation; D000111:Acetylcysteine / Q000378:metabolism; D000123:Acetyltransferases / Q000037:antagonists & inhibitors / Q000378:metabolism*; D000818:Animals; D000838:Anions; D003545:Cysteine / Q000031:analogs & derivatives / Q000378:metabolism; D003593:Cytoplasm / Q000201:enzymology; D008658:Inactivation, Metabolic; D007668:Kidney / Q000201:enzymology*; D008861:Microsomes / Q000201:enzymology*; D008862:Microsomes, Liver / Q000201:enzymology*; D051381:Rats; D013448:Sulfobromophthalein / Q000494:pharmacology
chemical_list: D000838:Anions; D013448:Sulfobromophthalein; C002206:S-benzylcysteine; D000123:Acetyltransferases; D003545:Cysteine; D000111:Acetylcysteine