Neurochemical Research

, Volume 9, Issue 1, pp 121–132 | Cite as

Cyclic AMP-stimulated protein kinase activity in rabbit peripheral myelin

  • Vivian Zabrenetzky
  • Vivien Krygier-Brévart
  • Peter S. Spencer
Original Articles


Cyclic AMP-sensitive protein kinase activity has been found in suspensions of purified rabbit peripheral myelin. The enzyme phosphorylated the P0, “Y”, X, P1, and P2 myelin proteins. Kinase activity, which was maximal at physiological pH, 2.5 mM Mg2+, and 2 νM cAMP, was stimulated three-fold over basal levels by cyclic AMP. Addition of calcium or EGTA had no effect on the enzyme activity in the presence or absence of cyclic AMP. Cyclic GMP also did not stimulated endogenous or exogenous protein phosphorylation. Theophylline, an inhibitor of 3′,5′-cyclic nucleotide phosphodiesterase activity, increased protein kinase activity in the presence of cyclic AMP. These data show that PNS myelin proteins can be phosphorylated in situ by a protein kinase system whose activity is stimulated selectively by cyclic AMP.


Protein Kinase Theophylline Kinase Activity EGTA Phosphodiesterase 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© PLenum Publishing Corporation 1984

Authors and Affiliations

  • Vivian Zabrenetzky
    • 1
  • Vivien Krygier-Brévart
    • 1
  • Peter S. Spencer
    • 1
  1. 1.Institute of Neurotoxicology Departments of Neuroscience and Pathology Rose F. Kennedy Center for Research in Mental Retardation and Human DevelopmentAlbert Einstein College of MedicineBronx

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