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PI(3,4,5)P3 potentiates phospholipase C-beta activity.

Yong Zhang¹, Sun Hyung Kwon, Walter K Vogel

¹Department of Pharmaceutical Sciences, Oregon State University, Corvallis, OR 97331, USA.

Journal of Receptor and Signal Transduction Research

|June 13, 2009

Summary

Phosphatidylinositol 3,4,5-trisphosphate (PIP(3)) potentiates calcium-stimulated phospholipase C-beta (PLC-beta) activity. This study reveals PIP(3) directly enhances PLC-beta function in G protein-coupled signaling pathways.

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PIP-on-a-chip: A Label-free Study of Protein-phosphoinositide Interactions

PIP-on-a-chip: A Label-free Study of Protein-phosphoinositide Interactions

Published on: July 27, 2017

Area of Science:

Cellular signaling
Biochemistry
Molecular biology

Background:

Phospholipase C-beta (PLC-beta) isozymes are crucial in G protein-coupled receptor (GPCR) signaling.
Previous work demonstrated PLC-beta1 and PLC-beta3 binding to phosphatidylinositol 3,4,5-trisphosphate (PIP(3)).

Purpose of the Study:

To investigate the role of PIP(3) in modulating PLC-beta activity.
To determine if PIP(3) directly potentiates calcium-stimulated PLC-beta function.

Main Methods:

In vitro reconstitution assays to measure PLC-beta activity.
Agonist stimulation in intact cells to assess inositol phosphate (IP) accumulation.
Use of PI 3-kinase inhibitors (LY294002, wortmannin) and a constitutively active PI 3-kinase subunit (p110CAAX).
Receptor-ligand binding assays and fluorescence microscopy for protein localization.

Main Results:

PIP(3) was found to potentiate calcium-stimulated PLC-beta activity in vitro.
PI 3-kinase inhibition significantly reduced agonist-stimulated IP and inositol trisphosphate (IP(3)) accumulation.
Expression of activated PI 3-kinase increased IP(3) accumulation.
LY294002 did not directly affect G protein-coupled receptors, indicating PIP(3) acts downstream.
Coexpression with activated PI 3-kinase led to increased plasma membrane localization of PLC-beta3.

Conclusions:

PIP(3) plays a direct role in potentiating PLC-beta activity within GPCR signaling pathways.
PIP(3) enhances PLC-beta function, likely through direct interaction or modification, leading to increased signaling output.
The PH domain of PLC-beta may not be essential for PI 3-kinase-induced membrane recruitment.