Abstract:
:Autophosphorylation of phosphorylase kinase from rabbit skeletal muscle was stimulated by acidic phospholipids such as phosphatidic acid (PA), phosphatidylinositol, and phosphatidyl-serine. PA stimulated an initial velocity of autophosphorylation 3.8-fold. When fully autophosphorylated, about 11 mol of phosphate per tetramer (alpha beta gamma delta) were incorporated in the presence of PA and about 6.5 mol in the absence of PA. In the presence of PA (100 micrograms/ml), there was a concomitant enhancement of its kinase activity about 25-fold at pH 6.8. PA (100 micrograms/ml) sharply decreased an apparent Ka for Ca2+ on autophosphorylation from 4.0 X 10(-5) M to 1.0 X 10(-6) M. Available evidence indicates that the Ca2+-activated, PA-dependent autophosphorylation of phosphorylase kinase shows an ability to stimulate glycogen breakdown.
journal_name
Biochem Biophys Res Communjournal_title
Biochemical and biophysical research communicationsauthors
Negami AI,Sasaki H,Yamamura Hdoi
10.1016/0006-291x(85)91296-3subject
Has Abstractpub_date
1985-09-16 00:00:00pages
712-9issue
2eissn
0006-291Xissn
1090-2104pii
0006-291X(85)91296-3journal_volume
131pub_type
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