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Phosphoprotein and the Central Nervous System Sinji Ishikawa 1 , Norio Shimazono 1 , Hideo Matsui 2 , Eiji Orikabe 2 1Dept. of Biochemistry, Brain Research Institute, Faculty of Med., Univ. of Tokyo 2Dept. of Biochemistry, Faculty of Med., Univ. of Tokyo pp.529-538
Published Date 1963/6/25
DOI https://doi.org/10.11477/mf.1431904035
  • Abstract
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 A survey of the present status of the study on phosphoproteins in brain as well as other animal organs were made.

 It was emphasized that phosphoprotein was the richest in brain among organs so far studied except germ cells of certain vertebrates, and metabolism of the compound was also known to be the most active in the central nervous system.

 The studies of Heald and othres revealed the rapid incorporation of radio active phosphrus into phosphoprotein from inorganic phosphate after application of electric stimulus on brain cortex slice.

 The authors of the present article were able to show the very rapid incorporation of radioactive phosphorus into phosphoproteins from labeled adenosine triphosphate by brain particulate matter.

 Under the same experimental conditions, the incorporation into fractions other than phosphoprotein were negligible. Phosphoprotein-kinase was shown to be firmly attached to the particulate fraction thus indicating that the observed incorporation was the reaction catalyzed by this enzyme.

 Labeled phosphoprotein obtained was purified more than 70 fold after solubilization with dilute acid and was found to be very similar to phosvitin, a phosphoprotein obtained from egg yolk.

 Possible roles of the phosphoprotein in brain were discussed especilally relating to the carrier role of the compound in active transport.


Copyright © 1963, Igaku-Shoin Ltd. All rights reserved.

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電子版ISSN 1882-1243 印刷版ISSN 0001-8724 医学書院

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