title: [Oxygen isotope exchange reactions in synaptosomal plasmatic membrane system].
abstract: Mg2+-Dependent, Ca2+-activated adenosine triphosphatase (E. C. 3.6.1.4) of synaptosomal plasmatic membrane from cow brain catalyses isotopic exchange of oxygen atoms: KH2P18O 4 in equilibrium H2O, the degree of exchange depending on Ca2+ concentration. The 18O-exchange catalysis suggests that the enzyme under consideration acts as a transport ATPase.
mesh_terms: D000251:Adenosine Triphosphatases / Q000378:metabolism*; D000818:Animals; D001693:Biological Transport, Active; D002118:Calcium / Q000494:pharmacology; D002417:Cattle; D008274:Magnesium / Q000494:pharmacology; D009994:Osmolar Concentration; D010100:Oxygen; D010710:Phosphates / Q000378:metabolism; D013570:Synaptic Membranes / Q000201:enzymology*; D013574:Synaptosomes / Q000201:enzymology
chemical_list: D010710:Phosphates; D000251:Adenosine Triphosphatases; D008274:Magnesium; D010100:Oxygen; D002118:Calcium
vernacular_title: Reaktsii izotopnogo obmena kisloroda neorganicheskogo fosfata v sisteme plazmaticheskikh membran sinaptosom.