Predicted to enable glutamate receptor activity and transmitter-gated monoatomic ion channel activity involved in regulation of postsynaptic membrane potential. Predicted to contribute to NMDA glutamate receptor activity. Predicted to be involved in glutamatergic synaptic transmission; ionotropic glutamate receptor signaling pathway; and modulation of chemical synaptic transmission. Predicted to act upstream of or within monoatomic ion transmembrane transport. Predicted to be located in postsynaptic membrane. Predicted to be active in postsynaptic density membrane. Orthologous to human GRIN3B (glutamate ionotropic receptor NMDA type subunit 3B).