title: Purification and characterization of mouse mevalonate pyrophosphate decarboxylase.
abstract: Mevalonate pyrophosphate decarboxylase (MPD) in mouse liver was purified by affinity chromatography. The purified enzyme was a homodimer of 46-kDa subunits and had an isoelectric point of 5.0. Kinetic analysis revealed an apparent Km value of 10 microm for mevalonate pyrophosphate. The enzyme required ATP as a phosphate acceptor and Mg as a divalent cation, which could be substituted with Mn or Co. Its optimum pH was 4.0-7.0. A comparison with MPD from various other sources revealed the mouse MPD to have essentially the same properties as rat MPD, expect for the optimum pH range. An excess of rabbit anti-rat MPD antibody deleted approximately 80% of the MPD activity in the crude extract of mouse liver. These results suggested that the homodimer of 46-kDa subunits represents the major active form of MPD in mice.
authors.affiliation: Faculty of Pharmacy and Pharmaceutical Sciences, Fukuyama University, Hiroshima, Japan. mitihara@fupharm.fukuyama-u.ac.jp
authors.forename: Akihiro
authors.initials: A
authors.lastname: Michihara
authors.forename: Kenji
authors.initials: K
authors.lastname: Akasaki
authors.forename: Yukio
authors.initials: Y
authors.lastname: Yamori
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Tsuji
mesh_terms: D000818:Animals; D002262:Carboxy-Lyases / Q000302:isolation & purification* / Q000378:metabolism; D002413:Cations, Divalent; D002846:Chromatography, Affinity; D004591:Electrophoresis, Polyacrylamide Gel; D006863:Hydrogen-Ion Concentration; D007525:Isoelectric Focusing; D007700:Kinetics; D008099:Liver / Q000201:enzymology; D051379:Mice; D008970:Molecular Weight; D011233:Precipitin Tests; D051381:Rats
chemical_list: D002413:Cations, Divalent; D002262:Carboxy-Lyases; C022503:pyrophosphomevalonate decarboxylase