an excitatory synapse-specific RasGAP. Member of the NMDAR signaling complex in excitatory synapses it may play a role in NMDAR-dependent control of AMPAR potentiation and synaptic plasticity. ERK activation is up-regulated in neurons from SynGAP knockout mice, whereas P38 MAPK function is depressed. May play a critical role in the regulation of neuronal MAPK signaling, AMPAR membrane trafficking, and excitatory synaptic transmission. Interacts with CAMK2A/CAMK2B and MPDZ. Phosphorylated by CaM-kinase II. Dephosphorylated upon NMDA receptor activation or SYNGAP1/MPDZ complex disruption. Contains a PH domain and a Ras-GAP domain. Two alternatively spliced isoforms have been described. Note: This description may include information from UniProtKB.