The function of ENSG00000107186 (MPDZ, multiple PDZ domain crumbs cell polarity complex component) is as follows. Member of the NMDAR signaling complex that may play a role in control of AMPAR potentiation and synaptic plasticity in excitatory synapses (PubMed:11150294, PubMed:15312654). Promotes clustering of HT2RC at the cell surface (By similarity). {ECO:0000250|UniProtKB:O55164, ECO:0000269|PubMed:11150294, ECO:0000269|PubMed:15312654}.