Abstract
The rat brain synaptic membrane antigens D1, D2, and D3 were labelled by 125I and precipitated by antibodies in a crossed immunoelectrophoresis. The precipitates were stained, scraped off, reduced, and analysed by polyacrylamide gel electrophoresis in the presence of sodium dodecyl sulphate. The D1 antigen was composed of two polypeptide chains, apparent molecular weights 50 300 and 116 000, D2 of only one polypeptide chain, apparent molecular weight 139 000, and D3 of three polypeptides, apparent molecular weights 14 100, 23 500, and 34 400. Higher apparent molecular weight polypeptides were present in variable amounts in the D3 precipitate, except when the synaptic membrane extracts had been pre-treated with phospholipase D.
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