title: Purification and characterization of a novel 46.5-kilodalton esterase from mouse hepatic microsomes.
abstract: A novel membrane-bound esterase was purified from mouse hepatic microsomes. The purified protein (ES46.5K) showed a single protein-staining band on sodium dodecyl sulfate-polyacrylamide gel with a minimum molecular weight of 46.5 Kdalton. ES46.5K possessed esterase activity toward 11-acetoxy-delta 8-tetrahydrocannabinol (11-OAc-delta 8-THC) (27.1 mumol/min/mg protein) and p-nitrophenylacetate (119 mumol/min/mg protein), and these activities were 38 and 47 times, respectively, as high as those of microsomes. The N-terminal amino acid sequence of the protein was as follows: G-K-T-I-S-L-L-I-S-V-V-L-V-A-Y-Y-L-Y-I. This sequence has no homology to those of the known carboxylesterases, indicating that this enzyme is a novel type of esterase bound to the microsomal membrane.
authors.affiliation: Department of Hygienic Chemistry, Faculty of Pharmaceutical Sciences, Hokuriku University, Kanazawa, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Watanabe
authors.forename: Y
authors.initials: Y
authors.lastname: Kayano
authors.forename: T
authors.initials: T
authors.lastname: Matsunaga
authors.forename: I
authors.initials: I
authors.lastname: Yamamoto
authors.forename: H
authors.initials: H
authors.lastname: Yoshimura
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001665:Binding Sites; D013759:Dronabinol / Q000031:analogs & derivatives / Q000378:metabolism; D004591:Electrophoresis, Polyacrylamide Gel; D004950:Esterases / Q000737:chemistry / Q000302:isolation & purification* / Q000378:metabolism; D008297:Male; D051379:Mice; D008862:Microsomes, Liver / Q000201:enzymology*; D008969:Molecular Sequence Data; D008970:Molecular Weight; D009596:Nitrophenols / Q000378:metabolism
chemical_list: D009596:Nitrophenols; C084895:11-acetoxy-delta(8)-tetrahydrocannabinol; D013759:Dronabinol; C008642:4-nitrophenyl acetate; D004950:Esterases