alexa Synthetic inositol 1,3,4,5-tetrakisphosphate analogs and their effect on the binding to microsomal fraction of rat cerebellum.
Biomedical Sciences

Biomedical Sciences

Biology and Medicine

Author(s): Kimura Y, Kanematsu T, Watanabe Y, Ozaki S, Koga T,

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Abstract Binding activity of [3H]inositol 1,3,4,5-tetrakisphosphate (InsP4) was characterized with rat cerebellar membranes. Two types of InsP4 analog with either the aminobenzoyl or the aminocyclohexanecarbonyl group on the 2nd position of InsP4 have been synthesized and their effects on the binding activity were also examined. [3H]InsP4 binding was gradually displaced by increasing amounts of unlabeled InsP4, with an IC50 of 60-170 nM, depending on the pH values. The binding was sharply increased at acidic pH and millimolar concentrations of Ca2+, this being in clear contrast with [3H]InsP3 binding noted in the same species of tissue. Heparin inhibited the binding, with an IC50 of 1.7, 3 or 20 micrograms/ml at pH 8.3, 7.2 or 5.0, respectively. Adenine nucleotide inhibited the binding more potently than did [3H]InsP3 binding. InsP4 analogs were as effective as InsP4 in displacing [3H]InsP4 from rat cerebellar membranes, thereby indicating that the 2nd hydroxyl group may not be involved in recognition of InsP4 by its binding sites.
This article was published in Biochim Biophys Acta and referenced in Biology and Medicine

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