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Related Concept Videos

Cell Signaling in Plants01:25

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...
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...
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...
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...
Amplifying Signals via Enzymatic Cascade01:22

Amplifying Signals via Enzymatic Cascade

When a ligand binds to a cell-surface receptor, the receptor's intracellular domain changes shape, which may either activate its enzyme function or allow its binding to other molecules. The initial signal is amplified by most signal transduction pathways. This means that a single ligand molecule can activate multiple molecules of a downstream target. Proteins that relay a signal are most commonly phosphorylated at one or more sites, activating or inactivating the protein. Kinases catalyze the...
Signal Transduction: Overview01:26

Signal Transduction: Overview

Cells respond to many types of information, often through receptor proteins positioned on the membrane. They respond to chemical signals, such as hormones, neurotransmitters, and other signaling molecules, initiating a series of molecular reactions to produce an appropriate response. This is called signal transduction. Cells also coordinate different responses elicited by the same signaling molecule via mediators, allowing molecular cross-talk.
Typically, signal transduction involves three...

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Related Experiment Video

Updated: Jun 27, 2026

Single-molecule Super-resolution Imaging of Phosphatidylinositol 4,5-bisphosphate in the Plasma Membrane with Novel Fluorescent Probes
07:26

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

Published on: October 15, 2016

Plant phospholipid signaling: "in a nutshell".

Teun Munnik1, Christa Testerink

  • 1Section of Plant Physiology, Swammerdam Institute for Life Sciences, University of Amsterdam, NL-1098SM, Amsterdam, The Netherlands. t.munnik@uva.nl

Journal of Lipid Research
|December 23, 2008
PubMed
Summary

Phosphoinositide signaling involves phospholipids beyond membrane structure. Plant systems share components with animals but exhibit key differences in this signaling pathway.

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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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Area of Science:

  • Cellular Biology
  • Biochemistry
  • Plant Signaling

Background:

  • Phosphoinositide/phospholipase C (PI/PLC) system discovered in animals, revealing phospholipids' signaling roles beyond membrane structure.
  • Receptor stimulation activates PLC, hydrolyzing phosphatidylinositol 4,5-bisphosphate [PtdIns(4,5)P2] into second messengers inositol 1,4,5-trisphosphate (InsP3) and diacylglycerol (DG).
  • InsP3 triggers calcium release, while DG activates protein kinase C (PKC) family members, leading to cellular reprogramming.

Purpose of the Study:

  • To explore the roles of phosphoinositides and their metabolizing enzymes in plant cell signaling.
  • To highlight the similarities and differences between plant and mammalian PI/PLC systems.
  • To discuss PtdIns4P and PtdIns(4,5)P2 as signaling molecules in plants.

Main Methods:

  • Review of existing literature on phosphoinositide signaling in both plant and animal systems.
  • Comparative analysis of PI/PLC pathway components and their functions across different kingdoms.
  • Focus on enzymes like phospholipase A, phospholipase D, and PI 3-kinase in signaling.

Main Results:

  • Plants possess many PI/PLC system components found in animals, indicating conserved signaling mechanisms.
  • Evidence for the role of phosphoinositides in plant cell signaling is growing.
  • Significant differences exist between plant and mammalian phosphoinositide signaling pathways.

Conclusions:

  • Phosphoinositides are crucial signaling molecules in plants, not just structural membrane components.
  • While sharing some pathways with animals, plant phosphoinositide signaling has unique features.
  • Further research is needed to fully elucidate the plant-specific aspects of this signaling system.