Muscle-specific MRNA Isoform Encodes a Protein Composed Mainly of the N-terminal 175 Residues of Type 2 Ins(1,4,5)P3 Receptor

Overview

Journal Biochem J

Specialty Biochemistry

Date 1998 Sep 8

PMID 9729462

Citations 6

Authors

A Futatsugi

G Kuwajima

K Mikoshiba

Affiliations

Soon will be listed here.

Abstract

We have found a novel isoform of the mouse type 2 Ins(1,4,5)P3 receptor [Ins(1,4,5)P3R] mRNA by reverse transcriptase-mediated PCR analysis. The novel isoform, which was expressed specifically in skeletal muscle and heart, was generated by the inclusion of a novel exon. As this exon contains a stop codon, the isoform encodes a putative protein (designated TIPR) consisting of 175 acid residues of the type 2 Ins(1,4,5)P3R and the following six residues derived from this exon. We transfected the cDNA of this isoform into COS-7 cells; these cells expressed a 24 kDa protein that was recognized by an antibody against TIPR produced in Escherichia coli. The isoform encoding TIPR was also found in human skeletal muscle and heart. The N-terminal region of Ins(1,4,5)P3R is suggested to have a role in ligand binding and to interact with the C-terminal channel domain of Ins(1,4,5)P3R itself. TIPR might regulate the Ins(1,4,5)P3 signal pathway in both muscles.

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