Inositol 1,4,5-Trisphosphate Receptor Type 1 (ITPR1) Antibody – Rabbit Polyclonal

This gene encodes an intracellular receptor for inositol 1,4,5-trisphosphate. Upon stimulation by inositol 1,4,5-trisphosphate, this receptor mediates calcium release from the endoplasmic reticulum. Mutations in this gene cause spinocerebellar ataxia type 15, a disease associated with an heterogeneous group of cerebellar disorders. Multiple transcript variants have been identified for this gene. [provided by RefSeq, Nov 2009]

IP3R1: a multi-pass endoplasmic reticulum membrane receptor for inositol 1,4,5-trisphosphate, a second messenger that mediates the release of intracellular calcium. Plays a role in ER stress-induced apoptosis. Cytoplasmic calcium released from the ER triggers apoptosis by the activation of CaMKII, eventually leading to the activation of downstream apoptosis pathways. Part of a cGMP kinase signaling complex that includes alpha-actin, calponin H1, phospholamban, PKG1 and IP3R1. Widely expressed. The receptor contains a calcium channel in its C-terminal extremity. Its large N-terminal cytoplasmic region has the ligand-binding site in the N-terminus and modulatory sites in the middle portion immediately upstream of the channel region. Phosphorylation by PKA prevents the ligand-induced opening of the calcium channels. Belongs to the ryanodine-inositol 1,4,5-triphosphate receptor ca(2+) channel (rir-cac) family. Eight alternatively spliced isoforms have been described.

Protein type: Channel, calcium; Membrane protein, integral; Membrane protein, multi-pass; Channel, ligand-gated

Chromosomal Location of Human Ortholog: 3p26.1

Cellular Component: endoplasmic reticulum membrane; membrane; sarcoplasmic reticulum; endoplasmic reticulum; postsynaptic density; nucleolus; integral to membrane; nuclear inner membrane; platelet dense granule membrane; calcineurin complex

Molecular Function: protein binding; calcium ion transmembrane transporter activity; calcium channel inhibitor activity; intracellular ligand-gated calcium channel activity; phosphoinositide binding; inositol 1,4,5-triphosphate-sensitive calcium-release channel activity

Biological Process: negative regulation of calcium-mediated signaling; epidermal growth factor receptor signaling pathway; platelet activation; inositol phosphate-mediated signaling; voluntary musculoskeletal movement; fibroblast growth factor receptor signaling pathway; nerve growth factor receptor signaling pathway; signal transduction; post-embryonic development; endoplasmic reticulum calcium ion homeostasis; phospholipase C activation; release of sequestered calcium ion into cytosol; calcium ion transport; response to hypoxia; energy reserve metabolic process; innate immune response; blood coagulation; vascular endothelial growth factor receptor signaling pathway; regulation of insulin secretion