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Turkey Erythrocytes Possess a Membrane-associated Inositol 1,4,5-trisphosphate 3-kinase That is Activated by Ca2+ in the Presence of Calmodulin

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Journal Biochem J
Specialty Biochemistry
Date 1987 Dec 1
PMID 2829830
Citations 21
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Abstract

Turkey erythrocytes contain soluble and particulate kinase activities which catalyse the ATP-dependent phosphorylation of inositol 1,4,5-trisphosphate [Ins(1,4,5)P3]. The particle-bound activity accounts for approximately one-quarter of the total cellular Ins(1,4,5)P3 kinase, when assayed at a [Ca2+] of 10 nM. The particle-bound Ins(1,4,5)P3 kinase is not washed from the membrane by 0.6 M-KCl, yet may be solubilized by a variety of detergents. This suggests that it is an intrinsic membrane protein. The product of the membrane-bound Ins(1,4,5)P3 kinase is inositol 1,3,4,5-tetrakisphosphate [Ins(1,3,4,5)P4], identifying the enzyme as an Ins(1,4,5)P3 3-kinase. In the presence of calmodulin, the membrane-associated Ins(1,4,5)P3 3-kinase is activated as [Ca2+] is increased over the range 0.2-1.0 microM. Under these conditions, the rates of dephosphorylation of Ins(1,3,4,5)P4 and Ins(1,4,5)P3 by phosphatases in the membrane fraction are unchanged.

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