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. 1984 May;81(10):3143–3147. doi: 10.1073/pnas.81.10.3143

Developmental studies of phospholipid-sensitive Ca2+-dependent protein kinase and its substrates and of phosphoprotein phosphatases in rat brain.

R S Turner, R L Raynor, G J Mazzei, P R Girard, J F Kuo
PMCID: PMC345237  PMID: 6328500

Abstract

Ontogenetic changes in the protein phosphorylation/dephosphorylation systems in rat brain were investigated. It was found that the activity level of phospholipid-sensitive Ca2+-dependent protein kinase (PL-Ca-PK) in the particulate fraction of grey and white matter and the soluble fraction of grey matter increased rapidly and markedly after birth, reached the highest level at day 30, and declined slightly or remained unchanged thereafter. The enzyme level in the soluble fraction of white matter, in contrast, remained constant throughout the development and maturation of brain. Various ontogenetic changes in the substrate proteins for PL-Ca-PK were also noted. The levels of myelin basic protein and other substrates (notably the Mr 87,000, 58,000, 54,000, and 50,000 protein in grey matter) progressively increased during development, reaching the highest level at adulthood. The level of the Mr 66,000 protein from the particulate fraction of white and grey matter, on the other hand, increased rapidly after birth, reached a peak at day 18, and then declined to the initial neonatal level at the adult stage. The time scale for the increases in the levels of PL-Ca-PK and its many substrates paralleled that of brain development and maturation (synaptogenesis and myelinogenesis). The activity levels of phosphoprotein phosphatases (assayed using 32P-labeled myelin basic protein, histone, and protamine sulfate) were found to only slightly (up to 60%) increase or decrease in certain fractions from different brain regions during development, suggesting that phosphorylation, compared to dephosphorylation, may be more important in determining the phosphorylation state of cellular proteins.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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