Cyclic AMP-stimulated protein kinase activity in rabbit peripheral myelin |
| |
Authors: | Vivian Zabrenetzky Vivien Krygier-Brévart Peter S Spencer |
| |
Institution: | (1) Institute of Neurotoxicology Departments of Neuroscience and Pathology Rose F. Kennedy Center for Research in Mental Retardation and Human Development, Albert Einstein College of Medicine, 10461 Bronx, New York;(2) Present address: NICHD, Section on Nerve Growth Factors, NIH, 9000 Rockville Pike, Building 6, 1A02, 20205 Bethesda, Maryland;(3) Present address: Pall Corporation, 30 Sea Cliff, 11542 Glen Cove, New York |
| |
Abstract: | 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 M 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. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|