Many membrane proteins that contain a PDZ-binding domain require an interaction with a PDZ protein for correct targeting to the cell surface (Zheng et al. 2011). N-methyl-D-aspartate (NMDA) receptor interact with postsynaptic density protein (PSD-95) and the PSD-95 family might serve to anchor NMDA receptors to the submembrane cytoskeleton and aid in the assembly of signal transduction complexes at postsynaptic sites (Niethammer et al. 1996, Kornau et al. 1995, Sans et al. 2000).