The rat brain postsynaptic density fraction contains a homolog of the Drosophila discs-large tumor suppressor protein

Neuron
K O ChoM B Kennedy

Abstract

In CNS synapses, the synaptic junctional complex with associated postsynaptic density is presumed to contain proteins responsible for adhesion between pre- and postsynaptic membranes and for postsynaptic signal transduction. We have found that a prominent, brain-specific protein (PSD-95) enriched in the postsynaptic density fraction from rat brain is highly similar to the Drosophila lethal(1)discs-large-1 (dlg) tumor suppressor protein. The dlg protein is associated with septate junctions in developing flies and contains a guanylate kinase domain that is required for normal control of cell division. The sequence similarity between dlg and PSD-95 suggests that molecular mechanisms critical for growth control in developing organisms may also regulate synapse formation, stabilization, or function in the adult brain.

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Related Concepts

DLG4
Tissue Membrane
Presynaptic density protein 95
Intracellular Signaling Proteins
Drosophila melanogaster Proteins
Cell Division
Brain
Neoplasms
BINP-binding protein, rat
Drosophila

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