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Related Concept Videos

Catenins01:23

Catenins

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Catenins are characterized by multiple binding domains and dynamic structures that allow them to function as linker proteins in cell junction complexes. All catenins, except α-catenin, contain a characteristic protein sequence called the armadillo repeat and are therefore also called armadillo proteins.
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Tension Response at Adherens Junctions01:26

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The adherens junctions that anchor cells together are multi-protein complexes that dynamically adapt to mechanical stimuli such as tensile forces and shear stress. Mechanosensory proteins in these junctions can sense such mechanical stimuli and undergo a shift in their conformation, resulting in an altered function — a process called mechanotransduction.
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The cytoskeleton is an essential cell component that plays several structural and functional roles. However, the filaments that make up the cytoskeleton cannot function independently and depend on the accessory or ancillary proteins to effectively carry out their function. Accessory proteins associate with cytoskeletal filaments and their monomers, aiding filament formation and function. They also help in the cross-communication among cytoskeletal filaments. Cytoskeletal accessory proteins are...
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Multiprotein signaling complexes are formed in a dynamic process involving protein-protein interactions at the cytoplasmic domain of transmembrane receptors or enzymatic and non-enzymatic proteins associated with the receptor. These complexes ensure the activation and propagation of intracellular signals that regulate cell functions.
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Cadherins in Tissue Organization01:19

Cadherins in Tissue Organization

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The cadherins are a superfamily of cell adhesion molecules comprising over 180 variants, with specific tissues expressing a particular combination of cadherin types. Cadherins generally exhibit homophilic binding; i.e., cadherins on one cell bind to cadherins of the same or closely related type on another cell. Thus, cells of the same type have a specific affinity to bind to each other and sort themselves into clusters to form tissues.
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Cell sorting plays an...
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Adherens Junctions01:24

Adherens Junctions

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Strong contact points between adjacent cells anchor them to each other, forming tissues. Such anchoring junctions are of two types –  adherens junctions and desmosomes. Adherens junctions are abundant in tissues such as  epithelium and endothelium, forming a continuous zone of adhesion called the adhesion belt. In other tissues, such as  heart muscle, they appear as clusters, linking the cells to produce coordinated heart muscle contraction.
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Related Experiment Video

Updated: Feb 18, 2026

Reconstitution Of β-catenin Degradation In Xenopus Egg Extract
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Versatile Scaffold: Extrajunctional Roles for α-Catenin.

Srikanth Budnar1, Alpha S Yap1

  • 1Division of Cell Biology and Molecular Medicine, Institute for Molecular Bioscience, The University of Queensland, Brisbane, QLD 4072, Australia.

Developmental Cell
|November 22, 2017
PubMed
Summary

Alpha-catenin (α-catenin), known for cell adhesion, also regulates single-cell migration. A newly identified extrajunctional pool of α-catenin controls directional cell movement by modulating RhoA signaling pathways.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Alpha-catenin (α-catenin) is a key scaffolding protein in cell-cell adhesion complexes.
  • It links the cadherin-catenin complex to the F-actin cytoskeleton.
  • Its role beyond cell-cell junctions is less understood.

Purpose of the Study:

  • To investigate the functions of α-catenin outside of cell-cell junctions.
  • To identify novel regulatory roles of α-catenin in cell migration.
  • To elucidate the molecular mechanisms underlying α-catenin-mediated cell movement.

Main Methods:

  • Immunofluorescence microscopy to visualize α-catenin localization.
  • RhoA activation assays to measure signaling dynamics.
  • Live-cell imaging to track single-cell migration.
  • Biochemical assays to assess protein interactions.

Main Results:

  • An extrajunctional pool of α-catenin was identified in migrating cells.
  • This pool of α-catenin directly regulates RhoA signaling.
  • Loss of extrajunctional α-catenin impairs directional cell migration.

Conclusions:

  • Alpha-catenin possesses a dual role in both cell adhesion and single-cell migration.
  • Extrajunctional α-catenin acts as a critical regulator of cell polarity and directional movement.
  • Targeting this extrajunctional pool may offer new strategies for controlling cell migration in various biological contexts.