THE SUBCELLULAR DISTRIBUTION OF CEREBRAL PHOSPHOPROTEINS
- 1 June 1965
- journal article
- research article
- Published by Portland Press Ltd. in Biochemical Journal
- Vol. 95 (3), 883-888
- https://doi.org/10.1042/bj0950883
Abstract
The subcellular distribution of the phosphoprotein fraction of grey matter from guinea-pig brain has been determined. Phosphoproteins occurred in all fractions of the tissue, the mitochondrial fraction containing 29%, supernatant 26%, microsomal fraction 23% and nuclear fraction 15%. The quantity of phosphoproteins per unit quantity of protein was highest in the microsomal fraction and lowest (by a factor of nearly 50%) in the mitochondrial fraction. Observations are reported on the nature of the nuclear subfraction believed from earlier work to contain a phosphoprotein sensitive to the effects of electrical pulses applied to cerebral slices in vitro. With respect to its content of phosphoprotein, cholesterol, ribonucleic acid and suc-cinate-dehydrogenase activity, the subfraction resembles the nerve-ending fraction of the mitochondrial fraction, from which it appears to be derived by cross-contamination. Electron microscopy tended to confirm this impression. Reasons are adduced for discounting the earlier claim that the sensitive phosphoprotein is contained in a new subcellular structure distinct from nuclei, mitochondria or micro-somes.Keywords
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