title: Improved purification and partial characterization of (Na+, K+)-ATPase from cardiac muscle.
abstract: A method is described for purification of (Na+, K+)-ATPase which yielded approximately 60 mg of enzyme from 800 g of cardiac muscle with specific activities ranging from 340 to 400 mumol inorganic phosphate/mg protein per h (units/mg). Sodium dodecyl sulfate-polyacrylamide gel electrophoresis indicated the presence of a major 94 000 dalton polypeptide and four or five lesser components, one of which was a glycoprotein with an apparent molecular weight of 58 000. The enzyme preparation bound 600-700 pmol of [3H]ouabain/mg protein when incubated in the presence of either Mg2+ plus Pi, or Mg2+ plus ATP plus Na+, and incorporated more than 600 pmol 32P/mg protein when incubated with gamma-32P-labelled ATP in the presence of Mg2+ and Na+. The preparation is approximately 35% pure.
mesh_terms: D000251:Adenosine Triphosphatases / Q000302:isolation & purification / Q000378:metabolism*; D000818:Animals; D002417:Cattle; D002951:Citrates / Q000494:pharmacology; D003840:Deoxycholic Acid; D004591:Electrophoresis, Polyacrylamide Gel; D004789:Enzyme Activation / Q000187:drug effects; D007454:Iodides; D007700:Kinetics; D008970:Molecular Weight; D009206:Myocardium / Q000201:enzymology*; D011188:Potassium / Q000494:pharmacology; D012964:Sodium / Q000494:pharmacology
chemical_list: D002951:Citrates; D007454:Iodides; D003840:Deoxycholic Acid; D012964:Sodium; D000251:Adenosine Triphosphatases; D011188:Potassium