title: Deacylation of N-arylformamides and N-arylacetamides by formamidase in rat liver.
abstract: The in vitro deacylation of N-arylformamides and N-arylacetamides to arylamines was examined in rat liver preparations. When 2-acetylaminofluorene or 2-formylaminofluorene was incubated with rat liver microsomes or cytosol, the deacylated metabolite, 2-aminofluorene, was formed. The deacylating activity of liver microsomes was inhibited by bis(4-nitrophenyl)phosphate and phenylmethanesulfonyl fluoride, inhibitors of carboxylesterase. In contrast, the activity of liver cytosol was inhibited by diisopropyl fluorophosphate, an inhibitor of formamidase. Deacylation of these compounds appear to be mainly catalyzed by carboxylesterase in liver microsomes and formamidase in liver cytosol. 2-Formylaminofluorene, 2-acetylaminofluorene, 1-formylaminopyrene, 4-formylaminobiphenyl, 2-formylaminonaphthalene, 1-formylaminonaphthalene, and 2-acetylaminofluorene were deacylated by formamidase purified from rat liver cytosol. Formamidase catalyzed both N-formylation of arylamines, and deacylation of N-arylformamides and N-arylacetamides.
authors.affiliation: Graduate School of Biomedical Sciences, Hiroshima University, Minami-ku, Hiroshima, Japan.
authors.forename: Osamu
authors.initials: O
authors.lastname: Ueda
authors.forename: Shigeyuki
authors.initials: S
authors.lastname: Kitamura
authors.forename: Shigeru
authors.initials: S
authors.lastname: Ohta
mesh_terms: D000081:Acetamides / Q000737:chemistry / Q000378:metabolism*; D000215:Acylation; D000581:Amidohydrolases / Q000737:chemistry / Q000378:metabolism*; D000818:Animals; D006224:Cricetinae; D005559:Formamides / Q000737:chemistry / Q000378:metabolism*; D006168:Guinea Pigs; D008099:Liver / Q000201:enzymology*; D008297:Male; D008647:Mesocricetus; D051379:Mice; D011817:Rabbits; D051381:Rats; D017208:Rats, Wistar
chemical_list: D000081:Acetamides; D005559:Formamides; D000581:Amidohydrolases; C101846:formamidase