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Effect of calcium on the endogenous phosphorylation of mouse brain microsomes in vitro.

Abstract：

:1. The endogenous phosphorylation of mouse brain microsomes was studied using the technique of acrylamide gel electrophoresis in the presence of sodium dodecyl sulfate (SDS). 2. It was found that specific proteins and lipids in brain microsomes were phosphorylated by the terminal phosphate of ATP under appropriate conditions. Six peaks of radioactivity were observed on SDS-polyacrylamide gel electrophoresis of 32Pi-labelled brain microsomes. The peaks were designated as P-I, P-II, P-III, P-IV, P-V, and P-VI. The peaks from P-I to P-V, which consist of phosphoproteins, underwent rapid dephosphorylation. On the other hand, P-VI, which consists of phospholipids, remained unaffected even after the complete hydrolysis of added ATP. 3. With the addition of 100 muM CaCl2 to the assay medium, the phosphorylation of brain microsomal proteins was stimulated; in the regions of P-I, P-II, and P-III, the amounts of 32Pi incorporation were approximately twice the 32Pi incorporation in the absence of Ca2+. On the other hand, 32Pi incorporation into P-VI was unaffected irrespective of the presence or absence of 100 muM CaCl2. In the presence of higher concentrations of Ca2+ (1-10 mM), the phosphorylation of all components was inhibited.

journal_name

J Biochem

journal_title

Journal of biochemistry

authors

Satomi D

doi

10.1093/oxfordjournals.jbchem.a131866

subject

Has Abstract

pub_date

1977-12-01 00:00:00

pages

1695-700

issue

6

eissn

0021-924X

issn

1756-2651

journal_volume

82

pub_type

杂志文章

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