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  • Title: Structure-function relationships of the mouse inositol 1,4,5-trisphosphate receptor.
    Author: Miyawaki A, Furuichi T, Ryou Y, Yoshikawa S, Nakagawa T, Saitoh T, Mikoshiba K.
    Journal: Proc Natl Acad Sci U S A; 1991 Jun 01; 88(11):4911-5. PubMed ID: 1647021.
    Abstract:
    The homotetrameric complex of inositol 1,4,5-triphosphate (InsP3) receptors displays a Ca2+ release activity in response to InsP3 molecules. Structure-function relationships of the mouse cerebellar InsP3 receptor have been studied by analyses of a series of internal deletion or C-terminal truncation mutant proteins expressed in NG108-15 cells. Within the large cytoplasmic portion of the InsP3 receptor, approximately 650 N-terminal amino acids are highly conserved between mouse and Drosophila, and this region has the critical sequences for InsP3 binding that probably form the three-dimensionally restricted binding site. The N-terminal region of each InsP3 receptor subunit also binds one InsP3 molecule. Cross-linking experiments have revealed that InsP3 receptors are intermolecularly associated at the transmembrane domains and/or the successive C termini. The interaction between the receptor subunit and InsP3 may cause a conformational change in the tetrameric complex, resulting in the opening of Ca2+ channels.
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