GRASP (GRP1-associated scaffold protein, tamalin) is a 395 amino acid protein
encoded by the human gene GRASP . GRASP is a scaffold protein that com-
prises multiple protein-interacting domains, including a 95 kDa postsynaptic
density protein (PSD-95)/discs-large/ZO-1 (PDZ) domain, a leucine-zipper
region and a carboxyl-terminal PDZ-binding motif. GRASP is involved with
intracellular trafficking and contributes to the macromolecular organization
of group 1 metabotropic glutamate receptors (mGluRs) at synapses. GRASP
forms a heteromer composed of GRASP , PSCD2 and at least one mGluR-1. It
also interacts with PSCD3, mGluR-2, mGluR-3 and mGluR-5. GRASP is highly
expressed in brain and has lower levels of expression in lung, heart, embryo,
kidney and ovary.