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. 1996 Jan 1;313(Pt 1):319–325. doi: 10.1042/bj3130319

A new inositol 1,4,5-trisphosphate binding protein similar to phospholipase C-delta 1.

T Kanematsu 1, Y Misumi 1, Y Watanabe 1, S Ozaki 1, T Koga 1, S Iwanaga 1, Y Ikehara 1, M Hirata 1
PMCID: PMC1216901  PMID: 8546702

Abstract

We have reported that two inositol 1,4,5-trisphosphate binding proteins, with molecular masses of 85 and 130 kDa, were purified from rat brain; the former protein was found to be the delta 1-isoenzyme of phospholipase C (PLC-delta 1) and the latter was an unidentified novel protein [Kanematsu, Takeya, Watanabe, Ozaki, Yoshida, Koga, Iwanaga and Hirata (1992) J. Biol. Chem. 267, 6518-6525]. Here we describe the isolation of the full-length cDNA for the 130 kDa Ins(1,4,5)P3 binding protein, which encodes 1096 amino acids. The predicted sequence of the 130 kDa protein had 38.2% homology to that of PLC-delta 1. Three known domains of PLC-delta 1 (pleckstrin homology and putative catalytic X and Y domains) were located at residues 110-222, 377-544 and 585-804 with 35.2%, 48.2% and 45.8% homologies respectively. However, the protein showed no PLC activity to phosphatidylinositol 4,5-bisphosphate and phosphatidylinositol. The 130 kDa protein expressed by transfection in COS-1 cells bound Ins(1,4,5)P3 in the same way as the molecule purified from brain. Thus the 130 kDa protein is a novel Ins(1,4,5)P3 binding protein homologous to PLC-delta 1, but with no catalytic activity. The functional significance of the 130 kDa protein is discussed.

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Selected References

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