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Related Concept Videos

IP3/DAG Signaling Pathway01:11

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...
Phosphoinositides and PIPs01:42

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...
What are Second Messengers?01:12

What are Second Messengers?

Because many receptor binding ligands are hydrophilic, they do not cross the cell membrane and thus their message must be relayed to a second messenger on the inside. There are several second messenger pathways, each with their own way of relaying information. G-protein coupled receptors can activate both phosphoinositol and cyclic AMP (cAMP) second messenger pathways. The phosphoinositol path is active when the receptor induces phospholipase C to hydrolyze the phospholipid,...
What are Second Messengers?01:12

What are Second Messengers?

Because many receptor binding ligands are hydrophilic, they do not cross the cell membrane and thus their message must be relayed to a second messenger on the inside. There are several second messenger pathways, each with their own way of relaying information. G-protein coupled receptors can activate both phosphoinositol and cyclic AMP (cAMP) second messenger pathways. The phosphoinositol path is active when the receptor induces phospholipase C to hydrolyze the phospholipid,...
Amplifying Signals via Second Messengers01:15

Amplifying Signals via Second Messengers

Many receptor binding ligands are hydrophilic; they do not cross the cell membrane but bind to cell-surface receptors. Thus, their message must be relayed by second messengers present in the cell cytoplasm. There are several second messenger pathways, each with its own way of relaying information. For example, the G protein-coupled receptors can activate both phosphoinositol and cyclic AMP (cAMP) second messenger pathways. The phosphoinositol pathway is active when the receptor induces...
Biosynthesis of Polysaccharides01:26

Biosynthesis of Polysaccharides

Polysaccharides such as glycogen and starch are synthesized from nucleoside diphosphate sugars, primarily uridine diphosphate glucose (UDPG) and adenosine diphosphate glucose (ADPG). These activated glucose donors act as key intermediates in carbohydrate metabolism and biosynthesis. UDPG primarily involves glycogen synthesis in animals and many bacteria, while ADPG plays a fundamental role in starch synthesis in plants and certain bacteria.UDPG is formed when glucose-1-phosphate reacts with...

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Related Experiment Video

Updated: Jun 23, 2026

Absolute Quantitation of Inositol Pyrophosphates by Capillary Electrophoresis Electrospray Ionization Mass Spectrometry
09:22

Absolute Quantitation of Inositol Pyrophosphates by Capillary Electrophoresis Electrospray Ionization Mass Spectrometry

Published on: August 13, 2021

Diphosphoinositol polyphosphates: metabolic messengers?

Stephen B Shears1

  • 1Inositide Signaling Group, National Institute of Environmental Health Sciences, NIH, DHHS, Research Triangle Park, NC 27709, USA. shears@niehs.nih.gov

Molecular Pharmacology
|May 15, 2009
PubMed
Summary
This summary is machine-generated.

Diphosphoinositol polyphosphates, also known as inositol pyrophosphates, act as crucial metabolic messengers. This review explores their signaling roles and molecular mechanisms.

More Related Videos

Preparation of Quality Inositol Pyrophosphates
10:34

Preparation of Quality Inositol Pyrophosphates

Published on: September 3, 2011

Identification of Inositol Phosphate or Phosphoinositide Interacting Proteins by Affinity Chromatography Coupled to Western Blot or Mass Spectrometry
08:07

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

Published on: July 26, 2019

Related Experiment Videos

Last Updated: Jun 23, 2026

Absolute Quantitation of Inositol Pyrophosphates by Capillary Electrophoresis Electrospray Ionization Mass Spectrometry
09:22

Absolute Quantitation of Inositol Pyrophosphates by Capillary Electrophoresis Electrospray Ionization Mass Spectrometry

Published on: August 13, 2021

Preparation of Quality Inositol Pyrophosphates
10:34

Preparation of Quality Inositol Pyrophosphates

Published on: September 3, 2011

Identification of Inositol Phosphate or Phosphoinositide Interacting Proteins by Affinity Chromatography Coupled to Western Blot or Mass Spectrometry
08:07

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:

  • Biochemistry
  • Cell Signaling
  • Molecular Biology

Background:

  • Inositol phosphates are key intracellular signaling molecules.
  • Diphosphoinositol polyphosphates represent a specialized subclass with unique structures.
  • Their precise biological roles are still being elucidated.

Purpose of the Study:

  • To propose a unifying theme for the diverse functions of diphosphoinositol polyphosphates.
  • To review current knowledge on their metabolic turnover and biological effects.
  • To discuss emerging molecular mechanisms of action.

Main Methods:

  • Literature review and synthesis of existing research.
  • Analysis of metabolic pathways and signaling cascades.
  • Evaluation of proposed molecular interaction models.

Main Results:

  • A common theme linking diphosphoinositol polyphosphate data is their function as metabolic messengers.
  • Evidence suggests these molecules regulate various cellular processes.
  • Several hypotheses exist regarding their precise modes of action.

Conclusions:

  • Diphosphoinositol polyphosphates are integral to cellular communication and metabolism.
  • Further research is needed to fully understand their complex signaling networks.
  • Elucidating their mechanisms will provide insights into cellular regulation.