Description: Binding of the PDZ domain of Disks large homolog 4 (DLG4) suppresses the ER-retention motif of Isoform 4 of Glutamate receptor subunit zeta-1 (GRIN1) in a splice variant-specific manner, thereby promoting cell surface expression of this particular isoform. This supports the hypothesis that local regulation of receptor exit from neuronal ER plays a role in modifying discrete synaptic receptor number.
