title: [Various physico-chemical properties of inorganic pyrophosphatase from the mouse spleen].
abstract: Manganese, calcium and mercury ions, as well as p-chloromercury benzoate and dithiothreitol are studied for their effect on the activity of inorganic pyrophosphatase (EC 3.6.1.1) of mice spleen. It is shown that Ca2+ and Mn2+ are inhibitors of this enzyme, but Mn2+ in low concentrations may replace Mg2+ in the pyrophosphatase reaction. Hg2+ and p-chloromercury benzoate inhibit the pyrophosphatase activity essentially but not completely. Mice spleen pyrophosphatase is very labile: its preincubation without the substrate for 30 min at 37 degrees C leads to a complete loss of the activity. Neither glycerol, nor glutathione and cysteine but magnesium ions, dithiothreitol and 2-mercaptoethanol protect the enzyme from inactivation. The enzyme is purified by the sulphate ammonium salting-out, gel filtration on Sephadex G-100 as well as by isoelectrofocusing in 5% PAAG. Then pyrophosphatase is eluted from gel and subjected to electrophoresis in the plane layer of the linear gradient of 5-15% PAAG with SDS or 5-25% PAAG without denaturing conditions. One zone corresponding to the molecular mass of 70 kDalton is obtained. It is splitted into two zones in electrophoresis with SDS and 2-mercaptoethanol.
mesh_terms: D000818:Animals; D055598:Chemical Phenomena; D002627:Chemistry, Physical; D004591:Electrophoresis, Polyacrylamide Gel; D006358:Hot Temperature; D043564:Inorganic Pyrophosphatase; D007700:Kinetics; D008274:Magnesium / Q000494:pharmacology; D008297:Male; D008345:Manganese / Q000494:pharmacology; D051379:Mice; D008970:Molecular Weight; D010710:Phosphates / Q000378:metabolism; D011755:Pyrophosphatases / Q000037:antagonists & inhibitors / Q000302:isolation & purification / Q000378:metabolism*; D013154:Spleen / Q000201:enzymology*
chemical_list: D010710:Phosphates; D008345:Manganese; D011755:Pyrophosphatases; D043564:Inorganic Pyrophosphatase; D008274:Magnesium
vernacular_title: Nekotorye fiziko-khimicheskie svoĭstva neorganicheskoĭ pirofosfatazy selezenki myshi.