D-myo-Inositol- 1,4,5-trisphosphate [I( 1,4,5)P3] receptors are a homologous family of tetrameric ligand-gated Ca2+ channels which allow mobilization of intracellular Ca2+ stores in response to activation of cell-surface receptors linked to I( 1,4,5)P3 generation. Although the ligand recognition site of the IP3 receptors appears to be in the N-terminal region, the exact nature of the molecular interactions is not understood. Several other IP3s are also found in living systems, and ...
[Billington, David C.; Baker, Raymond; Kulagowski, Janusz J.; Mawer, Ian M.; Vacca, Joseph P.; et al. Journal of the Chemical Society, Perkin Transactions 1: Organic and Bio-Organic Chemistry (1972-1999), 1989 , p. 1423 - 1429]