Enables ionotropic glutamate receptor binding activity and synaptic receptor adaptor activity. Involved in several processes, including dendritic spine morphogenesis; learning or memory; and regulation of signal transduction. Acts upstream of or within negative regulation of actin filament bundle assembly. Located in several cellular components, including Schaffer collateral - CA1 synapse; glutamatergic synapse; and postsynaptic density. Colocalizes with postsynaptic membrane. Is expressed in cerebral cortex. Orthologous to human SHANK1 (SH3 and multiple ankyrin repeat domains 1). [provided by Alliance of Genome Resources, Apr 2022]