Purification and characterization of mouse mevalonate pyrophosphate decarboxylase.
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.
Michihara
Akihiro
A
Faculty of Pharmacy and Pharmaceutical Sciences, Fukuyama University, Hiroshima, Japan. mitihara@fupharm.fukuyama-u.ac.jp
Akasaki
Kenji
K
Yamori
Yukio
Y
Tsuji
Hiroshi
H
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
D002413:Cations, Divalent; D002262:Carboxy-Lyases; C022503:pyrophosphomevalonate decarboxylase