title: [Purification, properties and regulation of urocaninase from rat liver].
abstract: Urocaninase (EC 4.2.1.4.9) from rat liver homogenate has been purified, using protein precipitation at pH 4,8, ammonium sulfate fractionation, gel-filtration through Sephadex G-200 and chromatography on DEAE-cellulose. Upon DEAE-cellulose chromatography urocaninase is separated from the proteins possessing the activity of 3',5'-AMP-dependent protein kinase. The purified enzyme becomes activated after addition of ATP and exogenous protein kinase or one of the fractions resulting from DEAE-cellulose chromatography. Using [gamma-32P]ATP, it has been shown that such activation is accompanied by incorporation of at least one phosphate residue into the enzyme molecule. The mol. weight of urocaninase as determined by gel-filtration is about 110 000. The Km value for urocanate is 15 . 10(-6) M, the isoelectric point lies at 5,6. The mechanism of regulation of the urocaninase activity in rat liver is discussed.
mesh_terms: D000818:Animals; D006836:Hydro-Lyases / Q000378:metabolism*; D007700:Kinetics; D008099:Liver / Q000201:enzymology*; D008970:Molecular Weight; D051381:Rats; D014559:Urocanate Hydratase / Q000302:isolation & purification / Q000378:metabolism*
chemical_list: D006836:Hydro-Lyases; D014559:Urocanate Hydratase
vernacular_title: Ochistka, svoĭstva i reguliatsiia urokaninazy pecheni krys.