Protein discs {postsynaptic density} (PSD) are on presynaptic and postsynaptic chemical-synapse membranes. PSDs have beta-adrenergic, glutamate, and gamma-aminobutyric acid (GABA) receptors. They have protein kinase enzymes that phosphorylate to alter synaptic structure. They contain filamentous proteins that can move and change shape, such as actin, actin/calmodulin-binding protein, fodrin or brain spectrin, and tubulin. Fodrin or brain spectrin is an actin-binding and calmodulin-binding protein.
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Date Modified: 2022.0224