Purification of the calmodulin-sensitive adenylate cyclase from bovine cerebral cortex

Biochemistry. 1985 Jul 2;24(14):3776-83. doi: 10.1021/bi00335a054.

Abstract

A calmodulin-sensitive adenylate cyclase was purified 3000-fold from bovine cerebral cortex using DEAE-Sephacel, calmodulin-Sepharose, and two heptanediamine-Sepharose column steps. The purified enzyme activity was stimulated by calmodulin, forskolin, 5'-guanylyl imidodiphosphate, and NaF. The molecular weight of the protein component was estimated as 328 000 with a smaller form of Mr 153 000 obtained in the presence of Mn2+. The most highly purified preparations contained major polypeptides of 150 000, 47 000, and 35 000 daltons on sodium dodecyl sulfate (SDS) gels. Photoaffinity labeling of the preparation with azido[125I]iodocalmodulin gave one product of 170 000 daltons on SDS gels. It is proposed that the catalytic subunit of the calmodulin-sensitive enzyme is 150 000 +/- 10 000 daltons and that the enzyme exists as a complex of one catalytic subunit and the stimulatory guanyl nucleotide regulatory complex. These data are consistent with the previous report that the catalytic subunit of this enzyme has a molecular weight of 150 000 +/- 10 000 [Andreasen, T.J., Heideman, W., Rosenberg, G.B., & Storm, D.R. (1983) Biochemistry 22,2757].

Publication types

  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Adenylyl Cyclases / isolation & purification*
  • Adenylyl Cyclases / metabolism
  • Animals
  • Calmodulin / pharmacology*
  • Cattle
  • Cerebral Cortex / enzymology*
  • Colforsin / pharmacology
  • Guanylyl Imidodiphosphate / pharmacology
  • Macromolecular Substances
  • Magnesium / pharmacology
  • Manganese / pharmacology
  • Molecular Weight
  • Protein Conformation
  • Sodium Fluoride / pharmacology

Substances

  • Calmodulin
  • Macromolecular Substances
  • Colforsin
  • Guanylyl Imidodiphosphate
  • Manganese
  • Sodium Fluoride
  • Adenylyl Cyclases
  • Magnesium