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Related Concept Videos

Phosphoinositides and PIPs01:42

Phosphoinositides and PIPs

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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...
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IP3/DAG Signaling Pathway01:11

IP3/DAG Signaling Pathway

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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...
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Amplifying Signals via Second Messengers01:15

Amplifying Signals via Second Messengers

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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...
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What are Second Messengers?01:12

What are Second Messengers?

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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,...
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PI3K/mTOR/AKT Signaling Pathway01:22

PI3K/mTOR/AKT Signaling Pathway

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The mammalian target of rapamycin  (mTOR) is a serine/threonine kinase that regulates growth, proliferation, and cell survival in response to hormones, growth factors, or nutrient availability. This kinase exists in two structurally and functionally distinct forms: mTOR complex 1  (mTORC1) and mTOR complex 2  (mTORC2). The first form (mTORC1) is composed of a rapamycin-sensitive Raptor and proline-rich Akt substrate, PRAS40. In contrast,  mTORC2 consists of a...
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Lipids as Anchors01:32

Lipids as Anchors

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In the plasma membrane, the lipids forming the bilayer can also act as an anchor to tether proteins to the membrane. The three main types of lipid anchors found in eukaryotes are – prenyl groups, fatty acyl groups, and glycosylphosphatidylinositol or GPI groups. Prenyl and fatty acyl groups act as anchors on the cytosolic surface of the membrane, whereas GPI anchors proteins on the extracellular side.
The carboxy-terminal of most of the prenylated proteins, such as Ras proteins, contains...
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Related Experiment Video

Updated: Aug 22, 2025

Single-molecule Super-resolution Imaging of Phosphatidylinositol 4,5-bisphosphate in the Plasma Membrane with Novel Fluorescent Probes
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Single-molecule Super-resolution Imaging of Phosphatidylinositol 4,5-bisphosphate in the Plasma Membrane with Novel Fluorescent Probes

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PI(4,5)P2: signaling the plasma membrane.

Rachel C Wills1, Gerald R V Hammond1

  • 1Department of Cell Biology, University of Pittsburgh School of Medicine, Pittsburgh, PA, U.S.A.

The Biochemical Journal
|November 11, 2022
PubMed
Summary

Phosphatidylinositol 4,5-bisphosphate (PI(4,5)P2) is crucial for plasma membrane function, regulating signaling, transport, and cell structure. This lipid acts as a cofactor, enabling proteins to perform specific functions at the cell surface.

Keywords:
5P2PIP2PtdIns4lipid raftsphospholipidssignaling

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Fluorescence-Based Measurements of Phosphatidylserine/Phosphatidylinositol 4-Phosphate Exchange Between Membranes
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PIP-on-a-chip: A Label-free Study of Protein-phosphoinositide Interactions
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Single-molecule Super-resolution Imaging of Phosphatidylinositol 4,5-bisphosphate in the Plasma Membrane with Novel Fluorescent Probes
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Fluorescence-Based Measurements of Phosphatidylserine/Phosphatidylinositol 4-Phosphate Exchange Between Membranes
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PIP-on-a-chip: A Label-free Study of Protein-phosphoinositide Interactions
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PIP-on-a-chip: A Label-free Study of Protein-phosphoinositide Interactions

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Area of Science:

  • Cell Biology
  • Biochemistry
  • Molecular Biology

Background:

  • Phosphatidylinositol 4,5-bisphosphate (PI(4,5)P2) is a key phosphoinositide lipid.
  • It plays a central role in regulating animal cell plasma membrane (PM) functions.

Purpose of the Study:

  • To provide an overview of the diverse roles of PI(4,5)P2 at the cell surface.
  • To re-evaluate the classification of PI(4,5)P2 from a signaling molecule to a cofactor.

Main Methods:

  • Literature review and synthesis of existing research on PI(4,5)P2 functions.
  • Analysis of signaling, transport, and structural roles of PI(4,5)P2.

Main Results:

  • PI(4,5)P2 is involved in second messenger generation, receptor modulation, membrane traffic, ion channel/transporter regulation, and cytoskeleton/cell polarity control.
  • Evidence supports PI(4,5)P2's role in enabling PM-specific protein functions.

Conclusions:

  • PI(4,5)P2 is essential for numerous cellular processes at the plasma membrane.
  • Reclassifying PI(4,5)P2 as a cofactor better reflects its function in facilitating protein activity at the PM.