| inositol phosphate | Virtually all of the possible phosphorylated states of inositol have been reported to occur in living tissues. The hexaphosphate, phytic acid, is abundant in many plant tissues and is a powerful calcium chelator. See: phosphatidyl inositol 3 kinase. (18 Nov 1997) |
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| 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 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) |