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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...

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...

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...

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...

Phosphorylation

Phosphorylation

The addition or removal of phosphate groups from proteins is the most common chemical modification that regulates cellular processes. These modifications can affect the structure, activity, stability, and localization of proteins within cells as well as their interactions with other proteins.
During phosphorylation, protein kinases transfer the terminal phosphate group of ATP to specific amino acid side chains of substrate proteins. Serine, threonine, and tyrosine are the most commonly...

Phosphorylation

Phosphorylation

The addition or removal of phosphate groups from proteins is the most common chemical modification that regulates cellular processes. These modifications can affect the structure, activity, stability, and localization of proteins within cells as well as their interactions with other proteins.
During phosphorylation, protein kinases transfer the terminal phosphate group of ATP to specific amino acid side chains of substrate proteins. Serine, threonine, and tyrosine are the most commonly...

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Related Experiment Video

Updated: Jun 28, 2026

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

Phosphoinositide phosphatases and disease.

Philip W Majerus¹, John D York

¹Division of Hematology, Washington University School of Medicine, Box 8125, St. Louis, MO 63110, USA. phil@dom.wustl.edu

Journal of Lipid Research

|November 13, 2008

Summary

This summary is machine-generated.

Inositol signaling research has advanced, focusing on inositol lipid hydrolysis by phosphatases and lipases. This review highlights how mutations in phosphoinositide phosphatases are linked to various diseases.

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

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Radiolabeling and Quantification of Cellular Levels of Phosphoinositides by High Performance Liquid Chromatography-coupled Flow Scintillation

Published on: January 6, 2016

Area of Science:

Biochemistry
Cell Biology
Molecular Biology

Background:

Inositol signaling is a complex cellular communication network.
Phosphoinositides act as crucial second messengers.
Previous reviews have extensively covered phosphoinositide kinases.

Purpose of the Study:

To review recent advances in inositol lipid hydrolysis.
To focus on the roles of phosphoinositide phosphatases.
To discuss the link between phosphoinositide phosphatase mutations and human diseases.

Main Methods:

Literature review of recent scientific publications.
Focus on enzymatic pathways of inositol lipid metabolism.
Analysis of genetic studies linking mutations to disease.

Main Results:

Detailed overview of phosphoinositide phosphatase functions.
Exploration of lipase isoforms involved in inositol lipid signaling.
Identification of specific phosphoinositide phosphatase mutations associated with diseases.

Conclusions:

Phosphoinositide phosphatases are critical regulators of inositol signaling.
Dysregulation of these enzymes through mutations contributes to pathogenesis.
Further research into these pathways could reveal new therapeutic targets.