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Related Concept Videos

Contact-dependent Signaling01:19

Contact-dependent Signaling

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Contact-dependent signaling, as the name suggests, requires that communicating cells be in direct contact with each other. This is achieved either through receptor-ligand interactions or by specialized cytoplasmic channels that allow the flow of small molecules between cells. In animal cells, channels called gap junctions facilitate contact-dependent signaling in certain tissues, whereas, plasmodesmata perform a similar function in plants.
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The organs in a multicellular organism’s body are made up of tissues formed by cells. To work together cohesively, cells must communicate. One way that cells communicate is through direct contact with other cells. The points of contact that connect adjacent cells are called intercellular junctions.
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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...
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Related Experiment Video

Updated: May 4, 2026

Author Spotlight: Microscopic Analysis of Protein Localization at Plasmodesmata in Plants
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Author Spotlight: Microscopic Analysis of Protein Localization at Plasmodesmata in Plants

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Receptor-mediated signaling at plasmodesmata.

Christine Faulkner1

  • 1John Innes Centre, Norwich Research Park Norwich, UK.

Frontiers in Plant Science
|January 4, 2014
PubMed
Summary

Plasmodesmata (PD) plasma membranes (PM) host specialized proteins, suggesting unique signaling platforms. These platforms differ from cellular PMs, impacting molecule movement and plant cell communication.

Area of Science:

  • Plant cell biology
  • Molecular plant pathology

Background:

  • Plasmodesmata (PD) connect plant cells, enabling intercellular molecule transport.
  • The PD plasma membrane (PM) composition and function are not fully understood.

Purpose of the Study:

  • To investigate the specialized nature of the PD PM.
  • To explore the role of PD PM proteins in cell signaling and communication.

Main Methods:

  • Proteomic analysis of PD PM proteins.
  • Comparative analysis of receptor kinase localization and function at PD PM versus cellular PM.

Main Results:

  • Proteomic data reveals PD PM enrichment with receptors, receptor kinases, and microdomain-associated proteins.
  • PD-located receptors and kinases perceive microbe-associated molecular patterns, modulating PD flux.
Keywords:
lipid raftplasmodesmatareceptor kinasereceptor proteintetraspanin enriched microdomain

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  • Developmentally relevant receptor kinases exhibit distinct interactions at PD PM compared to cellular PM.

    • Conclusions:

    • The PD PM is a specialized signaling platform, distinct from the cellular PM.
    • PD PM signaling platforms are crucial for plant defense and development.
    • Membrane microdomains likely contribute to specialized signaling at the PD PM.