title: Resolution of adenylate cyclase sensitive and insensitive to Ca2+ and calcium-dependent regulatory protein (CDR) by CDR-sepharose affinity chromatography.
abstract: Partially purified adenylate cyclase [ATP pyrophosphate-lyase (cyclizing), EC 4.6.1.1] from bovine brain cortex was fractionated into two separate forms by calcium-dependent regulatory protein (CDR)-Sepharose affinity chromatography. The major form of the enzyme, comprising approximately 80% of the applied activity, did not bind to the affinity column in the presence of Ca2+ and was insensitive to the CDR. Approximately 20% of adenylate cyclase activity was absorbed to CDR-Sepharose in the presence of Ca2+. This activity was stimulated by Ca2+ and CDR. This study directly demonstrates that brain cortex contains Ca2+-CDR-sensitive and -insensitive forms of adenylate cyclase and indicates that CDR-Sepharose may be a useful tool for purification of adenylate cyclase. The Ca2+ -stimulated adenylate cyclase was purified at least 55-fold with a 13% yield.
mesh_terms: D000262:Adenylyl Cyclases / Q000302:isolation & purification*; D000818:Animals; D002118:Calcium / Q000378:metabolism; D002147:Calmodulin / Q000378:metabolism*; D002352:Carrier Proteins / Q000378:metabolism*; D002417:Cattle; D002540:Cerebral Cortex / Q000201:enzymology; D002846:Chromatography, Affinity / Q000379:methods
chemical_list: D002147:Calmodulin; D002352:Carrier Proteins; D000262:Adenylyl Cyclases; D002118:Calcium