| inositol-1,4-bisphosphate 4-phosphohydrolase | <enzyme> Soluble rat brain enzyme highly specific for inositol 1,4-bisphosphate; does not act on inositol 1-phosphate or inositol 1,4,5-trisphosphate Registry number: EC 3.1.3.- Synonym: ibp 4-phosphohydrolase (26 Jun 1999) |
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| inositol 1-alpha-galactosyltransferase | <enzyme> Catalyses conversion of udpgalactose plus myo-inositol to galactinol plus udp Registry number: EC 2.4.1.123 Synonym: galactinol synthase (26 Jun 1999) |
| inositol 3 kinase | <enzyme> See phosphatidyl inositol 3 kinase. (18 Nov 1997) |
| inositol hexakisphosphate kinase | <enzyme> 54-kD enzyme that catalyses formation of diphosphoinositol pentakisphosphate (pp-ip5) from inositol hexakisphosphate; the reverse reaction acts as an ATP synthase Registry number: EC 2.7.4.- Synonym: ip(6) kinase (26 Jun 1999) |
| inositol lipid | A membrane-anchored phospholipid that transduces hormonal signals by stimulating the release of any of several chemical messengers. (09 Oct 1997) |
| inositol NAD epimerase | <enzyme> Converts myo-inositol to scyllo-inositol and neoinositol; inosose also formed and reverse reaction Registry number: EC 1.1.1.- (26 Jun 1999) |
| inositol O-methyltransferase | <enzyme> From mesembryanthemum crystallinum; uses s-adenosyl-l-methionine to methylate myo-inositol to form d-ononitol; monomeric mass 41 kD; has been sequenced Registry number: EC 2.1.1.- Synonym: myo-inositol o-methyltransferase, imt1 enzyme (26 Jun 1999) |
| inositol pentakisphosphate kinase | <enzyme> Has pronounced substrate specificity for d-inositol-1,2,4,5,6-pentakisphosphate which it converts to inositol hexakisphosphate Registry number: EC 2.7.1.- Synonym: insp5 kinase (26 Jun 1999) |
| inositol phosphates | Phosphoric acid esters of inositol. They include mono- and polyphosphoric acid esters, with the exception of inositol hexaphosphate which is phytic acid. (12 Dec 1998) |
| inositol polyphosphate 3-phosphatase | <enzyme> does not require magnesium and is not inhibited by lithium ions Registry number: EC 3.1.3.- Synonym: intp 3-phosphatase (26 Jun 1999) |
| inositol polyphosphate 4-phosphatase | <enzyme> Hydrolyzes the 4-position phosphate of phosphatidylinositol 3,4-bisphosphate Registry number: EC 3.1.3.- Synonym: ins polyp 4-phosphatase, ptdins(3,4)p2 4-phosphatase (26 Jun 1999) |
| inositol-tetrakisphosphate 1-kinase | <enzyme> A 46 kD enzyme from rat liver Registry number: EC 2.7.1.- Synonym: inositol 3,4,5,6-tetrakisphosphate 1-kinase, ins(3,4,5,6)p4 1-kinase (26 Jun 1999) |
| inositol triphosphate phosphomonoesterase | <enzyme> Human erythrocyte membrane enzyme converts inositol 1,4,5-trisphosphate into inositol 1,4-bisphosphate Registry number: EC 3.1.3.- Synonym: intp esterase, triphosphoinositide phosphomonoesterase, inositol triphosphate phosphatase, inositol triphosphate 5-phosphatase (26 Jun 1999) |
| inositol trisphosphate | Inositol 1, 4, 5 trisphosphate is important as a second messenger. It is released from phosphatidyl inositol bisphosphate by the action of a specific phospholipase C enzyme (PLC_) and binds to and activates a calcium channel in the endoplasmic reticulum. (18 Nov 1997) |
| adenosine 3',5'-cyclic monophosphate | An activator of phosphorylase kinase and an effector of other enzymes, formed in muscle from ATP by adenylate cyclase and broken down to 5'-AMP by a phosphodiesterase; sometimes referred to as the "second messenger." A related compound (2',3') is also known. Synonym: cyclic adenylic acid, cyclic AMP, cyclic phosphate. Acronym: cAMP (05 Mar 2000) |