FUNCTION: Postsynaptic density scaffolding protein. Binds and cross-links cytoplasmic regions of GRM1, GRM5, ITPR1, DNM3, RYR1, RYR2, SHANK1 and SHANK3. By physically linking GRM1 and GRM5 with ER-associated ITPR1 receptors, it aids the coupling of surface receptors to intracellular calcium release....
FUNCTION: Postsynaptic density scaffolding protein. Binds and cross-links cytoplasmic regions of GRM1, GRM5, ITPR1, DNM3, RYR1, RYR2, SHANK1 and SHANK3. By physically linking GRM1 and GRM5 with ER-associated ITPR1 receptors, it aids the coupling of surface receptors to intracellular calcium release. May also couple GRM1 to PI3 kinase through its interaction with AGAP2. Isoform 1 regulates the trafficking and surface expression of GRM5. Isoform 3 acts as a natural dominant negative, in dynamic competition with constitutively expressed isoform 1 to regulate synaptic metabotropic glutamate function. Isoform 3, may be involved in the structural changes that occur at synapses during long-lasting neuronal plasticity and development. Forms a high-order complex with SHANK1, which in turn is necessary for the structural and functional integrity of dendritic spines (By similarity). Negatively regulates T cell activation by inhibiting the calcineurin-NFAT pathway. Acts by competing with calcineurin/PPP3CA for NFAT protein binding, hence preventing NFAT activation by PPP3CA (PubMed:18218901). {ECO:0000250|UniProtKB:Q9Z214, ECO:0000269|PubMed:18218901}.
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GO - Biological processes (BP):
behavioral response to cocaine [GO:0048148]; chemical homeostasis within a tissue [GO:0048875]; chemical synaptic transmission [GO:0007268]; circadian rhythm [GO:0007623]; G protein-coupled glutamate receptor signaling pathway [GO:0007216]; phospholipase C-activating G protein-coupled glutamate rece...
behavioral response to cocaine [GO:0048148]; chemical homeostasis within a tissue [GO:0048875]; chemical synaptic transmission [GO:0007268]; circadian rhythm [GO:0007623]; G protein-coupled glutamate receptor signaling pathway [GO:0007216]; phospholipase C-activating G protein-coupled glutamate receptor signaling pathway [GO:0007206]; positive regulation of calcium ion transport [GO:0051928]; positive regulation of signal transduction [GO:0009967]; protein localization to synapse [GO:0035418]; protein tetramerization [GO:0051262]; regulation of calcium ion import [GO:0090279]; regulation of cation channel activity [GO:2001257]; regulation of dendritic spine maintenance [GO:1902950]; regulation of postsynaptic neurotransmitter receptor activity [GO:0098962]; regulation of store-operated calcium entry [GO:2001256]; regulation of synaptic transmission, glutamatergic [GO:0051966]; response to calcium ion [GO:0051592]; response to nicotine [GO:0035094]; skeletal muscle contraction [GO:0003009]; skeletal muscle fiber development [GO:0048741]
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GO - Molecular function (MF):
G protein-coupled glutamate receptor binding [GO:0035256]; protein-containing complex binding [GO:0044877]; scaffold protein binding [GO:0097110]; signaling adaptor activity [GO:0035591]; structural constituent of postsynapse [GO:0099186]; transmembrane transporter binding [GO:0044325]; type 5 metab...
G protein-coupled glutamate receptor binding [GO:0035256]; protein-containing complex binding [GO:0044877]; scaffold protein binding [GO:0097110]; signaling adaptor activity [GO:0035591]; structural constituent of postsynapse [GO:0099186]; transmembrane transporter binding [GO:0044325]; type 5 metabotropic glutamate receptor binding [GO:0031802]
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GO - Cellular component (CC):
apical part of cell [GO:0045177]; axon [GO:0030424]; costamere [GO:0043034]; cytoplasm [GO:0005737]; cytosol [GO:0005829]; dendrite [GO:0030425]; dendritic shaft [GO:0043198]; dendritic spine [GO:0043197]; excitatory synapse [GO:0060076]; glutamatergic synapse [GO:0098978]; neuronal cell body [GO:00...
apical part of cell [GO:0045177]; axon [GO:0030424]; costamere [GO:0043034]; cytoplasm [GO:0005737]; cytosol [GO:0005829]; dendrite [GO:0030425]; dendritic shaft [GO:0043198]; dendritic spine [GO:0043197]; excitatory synapse [GO:0060076]; glutamatergic synapse [GO:0098978]; neuronal cell body [GO:0043025]; neuron spine [GO:0044309]; plasma membrane [GO:0005886]; postsynaptic cytosol [GO:0099524]; postsynaptic density [GO:0014069]; Z disc [GO:0030018]
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