CAPON: a protein associated with neuronal nitric oxide synthase that regulates its interactions with PSD95.
Nitric oxide (NO) produced by neuronal nitric oxide synthase (nNOS) is important for N-methyl-D-aspartate (NMDA) receptor-dependent neurotransmitter release, neurotoxicity, and cyclic GMP elevations. The coupling of NMDA receptor-mediated calcium influx and nNOS activation is postulated to be due to a physical coupling of the receptor and the enzyme by an intermediary adaptor protein, PSD95, through a unique PDZ-PDZ domain interaction between PSD95 and nNOS. Here, we report the identification of a novel nNOS-associated protein, CAPON, which is highly enriched in brain and has numerous colocalizations with nNOS. CAPON interacts with the nNOS PDZ domain through its C terminus. CAPON competes with PSD95 for interaction with nNOS, and overexpression of CAPON results in a loss of PSD95/nNOS complexes in transfected cells. CAPON may influence nNOS by regulating its ability to associate with PSD95/NMDA receptor complexes.
Pubmed ID: 9459447 RIS Download
Adaptor Proteins, Signal Transducing | Animals | Binding, Competitive | Brain | Carrier Proteins | Cloning, Molecular | Drug Interactions | Guanylate Kinases | Intracellular Signaling Peptides and Proteins | Membrane Proteins | Molecular Sequence Data | Nerve Tissue Proteins | Neurons | Nitric Oxide Synthase | Rats | Rats, Sprague-Dawley | Tissue Distribution