Synaptic proteins. Characterization of tubulin and actin and identification of a distinct postsynaptic density polypeptide

doi:10.1083/jcb.79.1.173

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Synaptic proteins. Characterization of tubulin and actin and identification of a distinct postsynaptic density polypeptide

PT Kelly and CW Cotman

The major proteins in isolated synaptic junctions (SJs) and postsynaptic densities (PSDs) have been compared to actin, tubulin, and the major neurofilament (NF) protein by two-dimensional gel electrophoresis and tryptic peptide map analysis. These studies show: (a) tubulin is present in SJ and PSD fractions and is identical to cytoplasmic tubulin, (b) actin in these fractions is very similar to the gamma- and beta-actin found predominantly in nonmuscle cells, and (c) the major PSD protein is distinct from all other known fibrous proteins.
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