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. 1996 Aug 1;317(Pt 3):755–762. doi: 10.1042/bj3170755

The properties of a subtype of the inositol 1,4,5-trisphosphate receptor resulting from alternative splicing of the mRNA in the ligand-binding domain.

J P Lièvremont 1, H Lancien 1, M Hilly 1, J P Mauger 1
PMCID: PMC1217549  PMID: 8760359

Abstract

Subtypes of the type-1 inositol 1,4,5-trisphosphate (InsP3) receptor differ at the mRNA level in two small variably spliced segments. One segment (SI) encodes for a sequence within the InsP3-binding domain, thus its presence or absence could affect the functions of the receptor. We have used anti-peptide antibodies to confirm the existence of different subtypes of the InsP3 receptor (InsP3R) protein. The antibody against residues 322-332, within the SI region, recognized a 260 kDa polypeptide in membranes prepared from rat cerebellum or cerebral cortex. The cerebellum contained a few percent of the InsP3R protein having the SI region, whereas the cerebral cortex contained a high proportion of receptors with the SI region. These two tissues were representative of both isoforms, SI- or SI+, and displayed the same [3H]InsP3-binding characteristics. Thus, the SI region was not involved in the basic properties of the receptor. Deletion of the peptide 316-352 containing the SI segment greatly reduced InsP3 binding [Miyawaki, Furuichi, Ryou, Yoshikawa, Nakagawa, Saitoh and Mikoshiba (1991) Proc. Natl. Acad. Sci. U.S.A. 88, 4911-4915]. The antibodies against the SI region or against residues 337-349 did not modify the binding of [3H]InsP3 in the cortical membranes rich in the SI+ isoform or in cerebellar membranes. These results suggested that the SI region was not part of the binding site. The subcellular distribution of these two isoforms was then investigated in rat liver. The two isoforms were identified in different membrane fractions and they followed the same subcellular distribution. We suggest that the domain with the SI region may be involved in a function other than InsP3-induced Ca2+ release.

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Selected References

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