Abstract
Particulate fractions from whole rabbit brain, and from preparations enriched in neuronal or in glial cell bodies, were subjected to electrophoresis in two different systems, one containing sodium dodecyl sulphate and the other Triton X-100. Most membranes seemed to have three major polypeptides in common. Their molecular weights were calculated to be 44 000, 52 000 and 95 000. Homologous subcellular fractions derived from neuronal or glial cells showed only relatively minor differences in their polypeptide composition. Synaptosomal plasma membranes showed a more complex protein composition than the membranes surrounding neuronal or glial cell perikarya.
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