title: Cryopreservation of the cyclic 3',5'-adenosine monophosphate-dependent protein kinase from bovine cardiac muscle.
abstract: A method for the cryogenic storage of the cAMP-dependent protein kinase from bovine cardiac muscle is described. The catalytic parameters, kcat, KM, and kcat/KM are used to assess the activity of the enzyme both prior and subsequent to the freeze-thaw cycle. The enzyme is stored in cryogenic vials at -196 degrees C in liquid nitrogen. Complete retention of catalytic activity is dependent upon a rapid and efficient freeze-thaw cycle and the use of morpholinepropanesulfonic acid as the buffer. In addition, this buffer appears to eliminate the KCl- or NaCl-induced damage typically observed for enzymes stored at low temperature in phosphate buffer. As a result, morpholinepropanesulfonic acid may prove to be a more appropriate cryopreservation buffer than phosphate when the presence of salt is required for enzyme solubility or stability.
authors.affiliation: State University of New York, Buffalo 14214.
authors.forename: M
authors.initials: M
authors.lastname: Prorok
authors.forename: D S
authors.initials: DS
authors.lastname: Lawrence
mesh_terms: D000818:Animals; D002417:Cattle; D002846:Chromatography, Affinity; D002850:Chromatography, Gel; D002852:Chromatography, Ion Exchange; D004795:Enzyme Stability; D005615:Freezing; D007700:Kinetics; D046911:Macromolecular Substances; D009206:Myocardium / Q000201:enzymology*; D011494:Protein Kinases / Q000302:isolation & purification / Q000378:metabolism*
chemical_list: D046911:Macromolecular Substances; D011494:Protein Kinases