Enables NMDA glutamate receptor activity; PDZ domain binding activity; and protein N-terminus binding activity. Predicted to be involved in calcium ion transmembrane import into cytosol; excitatory postsynaptic potential; and long-term synaptic potentiation. Predicted to act upstream of or within several processes, including negative regulation of protein catabolic process; neuromuscular process controlling balance; and protein localization to postsynaptic membrane. Part of NMDA selective glutamate receptor complex. Orthologous to human GRIN2C (glutamate ionotropic receptor NMDA type subunit 2C). [provided by Alliance of Genome Resources, Apr 2022]