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Contact-dependent Signaling

Contact-dependent Signaling

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.
Gap Junctions
In animal cells, gap junctions are formed...

Plasmodesmata

Plasmodesmata

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.Intercellular junctions are a feature of fungal, plant, and animal cells alike. However, different types of junctions are found in different kinds of cells. Intercellular junctions found in animal...

Overview of Cell-Cell Junctions

Overview of Cell-Cell Junctions

The complex three-dimensional arrangement of cells in any multicellular organism is defined and maintained by interactions of cells with each other and the extracellular matrix. Cell-cell junctions are specialized structures where the multi-protein complexes on one cell interact with the multi-protein complexes on another cell. These cell junctions are classified into three main types based on their function — occluding, anchoring, and gap junctions.
Occluding or Tight Junctions
Tight...

Plasmodesmata

Plasmodesmata

In a multicellular organism, cells must communicate to work together in a coordinated manner. One way that cells communicate is through direct contact with other cells. The points of contact that connect adjacent cells are called intercellular junctions.
Intercellular junctions are a feature of fungal, plant, and animal cells. However, different types of junctions are found in different kinds of cells. Intercellular junctions found in animal cells include tight junctions, gap junctions, and...

Cell Adhesion in Plants

Cell Adhesion in Plants

Plants have rigid cell walls that are made up of cell wall polysaccharides that mediate cell-cell adhesion. The primary cell walls of plants consist of two independent and interacting polysaccharide networks: a pectin matrix that embeds the second network comprising cellulose and hemicelluloses.
Pectins are complex heteropolymers mainly composed of negatively-charged α-D-glucopyranosyl uronic acid and some neutral glycosyl residues such as α-L-rhamnopyranose, α-L-arabinofuranose, and...

Overview of Cell-Cell Junctions

Overview of Cell-Cell Junctions

The complex three-dimensional arrangement of cells in any multicellular organism is defined and maintained by interactions of cells with each other and the extracellular matrix. Cell-cell junctions are specialized structures where the multi-protein complexes on one cell interact with the multi-protein complexes on another cell. These cell junctions are classified into three main types based on their function — occluding, anchoring, and gap junctions.
Occluding or Tight Junctions
Tight...

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Related Experiment Video

Updated: Jun 30, 2026

Detection of Protein Interactions in Plant using a Gateway Compatible Bimolecular Fluorescence Complementation (BiFC) System

Detection of Protein Interactions in Plant using a Gateway Compatible Bimolecular Fluorescence Complementation (BiFC) System

Published on: September 16, 2011

Molecular chaperones: the plant connection.

Science (New York, N.Y.)

|November 16, 1990

Summary

Molecular chaperones are essential proteins that guide polypeptide assembly without becoming part of the final structure. These crucial molecules prevent incorrect protein interactions, impacting our understanding of protein self-assembly.

Area of Science:

Biochemistry
Molecular Biology
Cell Biology

Background:

Molecular chaperones are vital proteins present in all cell types.
They facilitate the correct assembly of other polypeptides.
Chaperones are not constituents of the final assembled protein structures.

Purpose of the Study:

To elucidate the role of molecular chaperones in protein assembly.
To understand how chaperones prevent nonfunctional protein structures.
To re-evaluate the principles of protein self-assembly in light of chaperone function.

Main Methods:

Studies focused on the chloroplast enzyme RuBisCO, a key player in photosynthesis.
Investigated the binding of chaperones to transiently exposed protein surfaces.

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Detection of Protein Interactions in Plant using a Gateway Compatible Bimolecular Fluorescence Complementation (BiFC) System

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Examined the impact of chaperone activity on preventing incorrect protein interactions.

Main Results:

Molecular chaperones mediate the proper assembly of polypeptides.
Chaperones bind to exposed protein surfaces, preventing aberrant interactions.
The function of chaperones challenges traditional concepts of protein self-assembly.

Conclusions:

Molecular chaperones are critical for cellular protein homeostasis.
Their mechanism involves preventing misfolding and aggregation.
Chaperone-mediated assembly represents a fundamental cellular process distinct from spontaneous self-assembly.