Homer Homolog-1 (HOMER1) Human Recombinant Protein

HOMER1: Postsynaptic density scaffolding protein. Binds and cross-links cytoplasmic regions of GRM1, GRM5, ITPR1, DNM3, RYR1, RYR2, SHANK1 and SHANK3. By physically linking GRM1 and GRM5 with ER-associated ITPR1 receptors, it aids the coupling of surface receptors to intracellular calcium release. May also couple GRM1 to PI3 kinase through its interaction with AGAP2. Isoform 1 regulates the trafficking and surface expression of GRM5. Isoform 3 acts as a natural dominant negative, in dynamic competition with constitutively expressed isoform 1 to regulate synaptic metabotropic glutamate function. Isoform 3, may be involved in the structural changes that occur at synapses during long-lasting neuronal plasticity and development. Interacts with IFT57. Interacts with OPHN1. Isoform 1 encodes a coiled-coil structure that mediates homo- and heteromultimerization. Belongs to the Homer family. 3 isoforms of the human protein are produced by alternative splicing.

Protein type: Adaptor/scaffold

Chromosomal Location of Human Ortholog: 5q14.2

Cellular Component: postsynaptic membrane; costamere; cell soma; apical part of cell; axon; excitatory synapse; dendritic shaft; cell junction; Z disc

Molecular Function: identical protein binding; metabotropic glutatmate receptor binding; protein heterodimerization activity; type 5 metabotropic glutamate receptor binding; protein complex scaffold

Biological Process: response to nicotine; circadian rhythm; skeletal muscle contraction; synaptic transmission; positive regulation of signal transduction; chemical homeostasis within a tissue; behavioral response to cocaine; metabotropic glutamate receptor, phospholipase C activating pathway; skeletal muscle fiber development; response to calcium ion; positive regulation of calcium ion transport