The primary intracellular IP3 receptor agonist
D-myo-Inositol-1,4,5-triphosphate (Ins(1,4,5)P3) is a second messenger produced in cells by phospholipase C mediated hydrolysis of phosphatidyl inositol-4,5-biphosphate.[1][2] It binds to one of several Ins(1,4,5)P3 receptors, each containing a calcium channel domain. Binding of Ins(1,4,5)P3 to the receptor results in opening of the calcium channels and an increase in intracellular calcium.[2][3]
Reference:
[1]. Streb, H., Irvine, R.F., Berridge, M.J., et al. Release of Ca2+ from a nonmitochondrial intracellular store in pancreatic acinar cells by inositol-1,4,5-trisphosphate. Nature 306(5938), 67-69 (1983).
[2]. Yoshida, Y., and Imai, S. Structure and function of inositol 1,4,5-triphosphate receptor. Jpn. J. Pharmacol. 74(2), 125-137 (1997).
[3]. Exton, J.H. Regulation of phosphoinositide phospholipases by hormones, neurotransmitters, and other agonists linked to G proteins. Annu. Rev. Pharmacol. Toxicol. 36, 481-509 (1996).
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