Resolution of adenylate cyclase sensitive and insensitive to Ca2+ and calcium-dependent regulatory protein (CDR) by CDR-sepharose affinity chromatography.
AUTOR(ES)
Westcott, K R
RESUMO
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.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=382906Documentos Relacionados
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