Involved in regulation of postsynaptic neurotransmitter receptor internalization. Located in Schaffer collateral - CA1 synapse and postsynaptic density. Is integral component of postsynaptic density membrane. Is active in glutamatergic synapse. Is expressed in brain and neural tube. Orthologous to human GSG1L (GSG1 like). [provided by Alliance of Genome Resources, Apr 2022]