Biomaterial Database

Structure and function of IP3 receptors. 1994

K Mikoshiba, and T Furuichi, and A Miyawaki

Department of Molecular Neurobiology, University of Tokyo, Minato-ku, Japan.

The molecular, structural and functional characteristics of the intracellular Ca2+ release channel activated by inositol 1,4,5-trisphosphate (IP3), also named IP3 receptor (IP3R), are described here. We also discuss the differences in primary structure, expression and modulation of the receptor subtypes and their physiological roles. The similarity and differences between the IP3R and the other intracellular Ca2+ channel, the ryanodine receptor, are briefly presented.

UI	MeSH Term	Description	Entries
D009124	Muscle Proteins	The protein constituents of muscle, the major ones being ACTINS and MYOSINS. More than a dozen accessory proteins exist including TROPONIN; TROPOMYOSIN; and DYSTROPHIN.	Muscle Protein,Protein, Muscle,Proteins, Muscle
D006801	Humans	Members of the species Homo sapiens.	Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000818	Animals	Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA.	Animal,Metazoa,Animalia
D013329	Structure-Activity Relationship	The relationship between the chemical structure of a compound and its biological or pharmacological activity. Compounds are often classed together because they have structural characteristics in common including shape, size, stereochemical arrangement, and distribution of functional groups.	Relationship, Structure-Activity,Relationships, Structure-Activity,Structure Activity Relationship,Structure-Activity Relationships
D015220	Calcium Channels	Voltage-dependent cell membrane glycoproteins selectively permeable to calcium ions. They are categorized as L-, T-, N-, P-, Q-, and R-types based on the activation and inactivation kinetics, ion specificity, and sensitivity to drugs and toxins. The L- and T-types are present throughout the cardiovascular and central nervous systems and the N-, P-, Q-, & R-types are located in neuronal tissue.	Ion Channels, Calcium,Receptors, Calcium Channel Blocker,Voltage-Dependent Calcium Channel,Calcium Channel,Calcium Channel Antagonist Receptor,Calcium Channel Antagonist Receptors,Calcium Channel Blocker Receptor,Calcium Channel Blocker Receptors,Ion Channel, Calcium,Receptors, Calcium Channel Antagonist,VDCC,Voltage-Dependent Calcium Channels,Calcium Channel, Voltage-Dependent,Calcium Channels, Voltage-Dependent,Calcium Ion Channel,Calcium Ion Channels,Channel, Voltage-Dependent Calcium,Channels, Voltage-Dependent Calcium,Voltage Dependent Calcium Channel,Voltage Dependent Calcium Channels
D015544	Inositol 1,4,5-Trisphosphate	Intracellular messenger formed by the action of phospholipase C on phosphatidylinositol 4,5-bisphosphate, which is one of the phospholipids that make up the cell membrane. Inositol 1,4,5-trisphosphate is released into the cytoplasm where it releases calcium ions from internal stores within the cell's endoplasmic reticulum. These calcium ions stimulate the activity of B kinase or calmodulin.	1,4,5-InsP3,Inositol 1,4,5-Triphosphate,Myo-Inositol 1,4,5-Trisphosphate,1,4,5-IP3,Myoinositol 1,4,5-Triphosphate
D053496	Inositol 1,4,5-Trisphosphate Receptors	Intracellular receptors that bind to INOSITOL 1,4,5-TRISPHOSPHATE and play an important role in its intracellular signaling. Inositol 1,4,5-trisphosphate receptors are calcium channels that release CALCIUM in response to increased levels of inositol 1,4,5-trisphosphate in the CYTOPLASM.	Inositol 1,4,5-Triphosphate Receptor,Inositol 1,4,5-Triphosphate Receptors,Inositol 1,4,5-Trisphosphate Receptor,1,4,5-INTP Receptor,INSP3 Receptor,INSP3 Receptor Type 1,INSP3 Receptor Type 2,INSP3 Receptor Type 3,IP3 Receptor,Inositol 1,4,5-trisphosphate Receptor Subtype 3,Inositol 1,4,5-trisphosphate Receptor Type 1,Inositol 1,4,5-trisphosphate Receptor Type 2,Inositol 1,4,5-trisphosphate Receptor Type 3,Inositol Triphosphate Receptor,Inositol-1,4,5-Triphosphate Receptor,Receptor, Inositol-1,4,5-triphosphate,Type 1 Inositol 1,4,5-trisphosphate Receptor,Type 3 Inositol 1,4,5-trisphosphate Receptor,Receptor, INSP3,Receptor, IP3,Receptor, Inositol Triphosphate,Triphosphate Receptor, Inositol
D018160	Receptors, Cytoplasmic and Nuclear	Intracellular receptors that can be found in the cytoplasm or in the nucleus. They bind to extracellular signaling molecules that migrate through or are transported across the CELL MEMBRANE. Many members of this class of receptors occur in the cytoplasm and are transported to the CELL NUCLEUS upon ligand-binding where they signal via DNA-binding and transcription regulation. Also included in this category are receptors found on INTRACELLULAR MEMBRANES that act via mechanisms similar to CELL SURFACE RECEPTORS.	Cytoplasmic Receptor,Cytoplasmic and Nuclear Receptors,Cytosolic and Nuclear Receptors,Hormone Receptors, Cytoplasmic,Hormone Receptors, Nuclear,Nuclear Hormone Receptor,Nuclear Receptor,Nuclear and Cytoplasmic Receptors,Cytoplasmic Hormone Receptors,Cytoplasmic Receptors,Cytosol and Nuclear Receptors,Intracellular Membrane Receptors,Nuclear Hormone Receptors,Nuclear Receptors,Receptors, Cytoplasmic,Receptors, Cytosol and Nuclear,Receptors, Cytosolic and Nuclear,Receptors, Intracellular Membrane,Receptors, Nuclear,Receptors, Nuclear and Cytoplasmic,Hormone Receptor, Nuclear,Membrane Receptors, Intracellular,Receptor, Cytoplasmic,Receptor, Nuclear,Receptor, Nuclear Hormone,Receptors, Cytoplasmic Hormone,Receptors, Nuclear Hormone
D019837	Ryanodine Receptor Calcium Release Channel	A tetrameric calcium release channel in the SARCOPLASMIC RETICULUM membrane of SMOOTH MUSCLE CELLS, acting oppositely to SARCOPLASMIC RETICULUM CALCIUM-TRANSPORTING ATPASES. It is important in skeletal and cardiac excitation-contraction coupling and studied by using RYANODINE. Abnormalities are implicated in CARDIAC ARRHYTHMIAS and MUSCULAR DISEASES.	Calcium-Ryanodine Receptor Complex,RyR1,Ryanodine Receptor 1,Ryanodine Receptor 2,Ryanodine Receptor 3,Ryanodine Receptors,Ca Release Channel-Ryanodine Receptor,Receptor, Ryanodine,RyR2,RyR3,Ryanodine Receptor,Ca Release Channel Ryanodine Receptor,Calcium Ryanodine Receptor Complex,Complex, Calcium-Ryanodine Receptor,Receptor 1, Ryanodine,Receptor 2, Ryanodine,Receptor 3, Ryanodine,Receptor Complex, Calcium-Ryanodine,Receptors, Ryanodine