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Phosphoinositides and PIPs

Phosphoinositides and PIPs

Phosphoinositides are a group of phospholipids containing a glycerol backbone with two fatty acid chains and a phosphate attached to a myoinositol sugar ring. The inositol head group extends into the cytoplasm, where it is modified by adding phosphate groups to form phosphatidylinositol phosphates or PIPs.
Different phosphoinositides are synthesized and recruited on the cytosolic face of the plasma membrane. The localization of specific phosphoinositides concentrated in separate membrane...

Cell Signaling in Plants

Cell Signaling in Plants

Plant cells communicate to coordinate their cycle of growth, flowering and fruiting, and activities in roots, shoots, and leaves in response to the changing environmental conditions. Plant signaling is distinct from animal signaling. Plants primarily utilize enzyme-linked receptors, whereas the largest class of cell-surface receptors in animals are G-protein coupled receptors (GPCRs). Unlike animals, receptor tyrosine kinases are rare in plants. Instead, plants have a diverse class of...

IP3/DAG Signaling Pathway

IP3/DAG Signaling Pathway

Membrane lipids such as phosphatidylinositol (PI) are precursors for several membrane-bound and soluble second messengers. Specific kinases phosphorylate PI and produce phosphorylated inositol phospholipids. One such inositol phospholipids are the phosphatidylinositol-4,5 bisphosphate [PI(4,5)P2], present in the inner half of the lipid bilayer. Upon ligand binding, GPCR stimulates Gq proteins to turn on phospholipase Cꞵ. Activated phospholipase Cꞵ cleaves PI(4,5)P2 and produces two-second...

Protein Kinases and Phosphatases

Protein Kinases and Phosphatases

Proteins undergo chemical modifications that trigger changes in the charge, structure, and conformation of the proteins. Phosphorylation, acetylation, glycosylation, nitrosylation, ubiquitination, lipidation, methylation, and proteolysis are various protein modifications that regulate protein activity. Such modifications are usually enzyme-driven.
Protein kinases
Many proteins in the cell are regulated by phosphorylation, the addition of a phosphate group. A family of enzymes called kinases...

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Related Experiment Video

Updated: Jun 25, 2026

Extraction and Quantification of Soluble, Radiolabeled Inositol Polyphosphates from Different Plant Species using SAX-HPLC

Extraction and Quantification of Soluble, Radiolabeled Inositol Polyphosphates from Different Plant Species using SAX-HPLC

Published on: June 26, 2020

Using genetic tools to understand plant phosphoinositide signalling.

Ingo Heilmann¹

¹Department of Plant Biochemistry, Georg-August-University Göttingen, Justus-von-Liebig-Weg 11, 37077 Göttingen, Germany. iheilma@uni-goettingen.de

Trends in Plant Science

|February 17, 2009

Summary

Phosphoinositides (PIs) regulate plant metabolism and growth. Understanding PI distribution and target protein interactions is key to improving plant hardiness and yield.

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Last Updated: Jun 25, 2026

Extraction and Quantification of Soluble, Radiolabeled Inositol Polyphosphates from Different Plant Species using SAX-HPLC

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Published on: June 26, 2020

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Identification of Inositol Phosphate or Phosphoinositide Interacting Proteins by Affinity Chromatography Coupled to Western Blot or Mass Spectrometry

Identification of Inositol Phosphate or Phosphoinositide Interacting Proteins by Affinity Chromatography Coupled to Western Blot or Mass Spectrometry

Published on: July 26, 2019

Area of Science:

Plant molecular biology
Lipid signaling
Cellular metabolism

Background:

Phosphoinositides (PIs) are essential regulatory lipids in eukaryotic cells.
The plant PI system plays a crucial role in regulating plant metabolism.
While mutant studies reveal PI relevance, factors controlling PI distribution and target interactions remain unclear.

Purpose of the Study:

To elucidate the functions of phosphoinositides (PIs) in plant-specific physiological processes.
To identify factors controlling PI distribution and their effects on target proteins.
To explore new opportunities for modulating plant growth and environmental hardiness.

Main Methods:

Analysis of mutant plants lacking specific PI species.
Integration of genetic approaches with biochemical analyses.
Application of cell biology techniques.

Main Results:

Mutant analyses have confirmed the physiological significance of various PI species in plants.
Current research highlights the central role of the plant PI system in metabolism.
Knowledge gaps exist regarding PI distribution control and target protein effects.

Conclusions:

Combining genetic, biochemical, and cell biology approaches is vital for understanding PI functions.
Further research into PI functions can lead to enhanced plant growth and environmental resilience.
Phosphoinositides offer potential targets for improving crop hardiness and yield.