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Related Concept Videos

Integrins01:10

Integrins

Animal and protozoan cells do not have cell walls to help maintain shape and provide structural stability. Instead, these eukaryotic cells secrete a sticky mass of carbohydrates and proteins into the spaces between adjacent cells. This network of proteins and molecules is called an extracellular matrix or ECM.
Some ECM proteins assemble into a basement membrane to which the remaining components adhere. Proteoglycans typically form the bulk of the ECM while fibrous proteins, like collagen,...
Activation of Integrins01:15

Activation of Integrins

Integrins bind ligands and transmit information from outside the cell to inside or vice-versa through an "outside-in signaling" or "inside-out signaling."
In "outside-in signaling," external factors in the extracellular space bind to exposed ligand binding sites on integrins. This causes the inactive protein to undergo a conformational change to become active. Integrins are often clustered on the cell membrane. Repetitive and regularly spaced ligand binding events provide an effective stimulus.
Intracellular Signaling Affects Focal Adhesions01:17

Intracellular Signaling Affects Focal Adhesions

Integrins act both as extracellular input receivers and as intracellular processing activators. As their name suggests, integrins are entirely integrated into the membrane structure. Their hydrophobic membrane-spanning regions interact with the phospholipid bilayer's hydrophobic region. These membrane receptors provide extracellular attachment sites for effectors like hormones and growth factors. They activate intracellular response cascades when their effectors are bound and active.
Some...
Anchoring Junctions01:03

Anchoring Junctions

Anchoring junctions are multiprotein complexes that help cells connect to other cells and the extracellular matrix. Anchoring junctions are present on the lateral and basal surfaces of cells, providing strong and flexible connections. Focal adhesions are often formed due to cell interactions with the ECM substrata, which initiate signal transduction via kinase cascades and other mechanisms. Together, they provide stability and tissue integrity. There are three types of anchoring junctions:...
Immunoglobulin-like Cell Adhesion Molecules01:31

Immunoglobulin-like Cell Adhesion Molecules

Immunoglobulin-like cell adhesion molecules or Ig-CAMs are a versatile group of cell surface glycoproteins belonging to the immunoglobulin protein superfamily. Ig-CAMs possess the characteristic immunoglobulin protein domains and other domains such as the fibronectin type III domain. The Ig domains are glycosylated to varying degrees in different Ig-CAMs.
Ig-CAMs exhibit either homophilic binding (to other Ig-CAMs) or heterophilic binding (to other ligands such as integrins). While most Ig-CAMs...
Fibronectins Connect Cells with ECM01:25

Fibronectins Connect Cells with ECM

Fibronectin is an adhesive glycoprotein present in the extracellular matrix of embryogenic and adult tissue. These molecules primarily aid in regulating cell motility and attachment. A fibronectin molecule is composed of two identical polypeptide chains attached to each other by a pair of disulfide bonds at the C-terminal.
Both proteoglycans and collagen are attached to fibronectin proteins, which, in turn, are attached to integrin proteins. These integrin proteins interact with transmembrane...

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Related Experiment Video

Updated: Jun 26, 2026

Static Adhesion Assay for the Study of Integrin Activation in T Lymphocytes
09:14

Static Adhesion Assay for the Study of Integrin Activation in T Lymphocytes

Published on: June 13, 2014

Linking integrin conformation to function.

Janet A Askari1, Patrick A Buckley, A Paul Mould

  • 1Wellcome Trust Centre for Cell-Matrix Research, Faculty of Life Sciences, University of Manchester, Manchester M13 9PT, UK.

Journal of Cell Science
|January 2, 2009
PubMed
Summary
This summary is machine-generated.

Integrin receptors are crucial for cell communication and function. Understanding their dynamic structural changes is key to deciphering their complex signaling pathways and biological roles.

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Analyzing Cell Surface Adhesion Remodeling in Response to Mechanical Tension Using Magnetic Beads
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Related Experiment Videos

Last Updated: Jun 26, 2026

Static Adhesion Assay for the Study of Integrin Activation in T Lymphocytes
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Static Adhesion Assay for the Study of Integrin Activation in T Lymphocytes

Published on: June 13, 2014

Analyzing Cell Surface Adhesion Remodeling in Response to Mechanical Tension Using Magnetic Beads
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Analyzing Cell Surface Adhesion Remodeling in Response to Mechanical Tension Using Magnetic Beads

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Area of Science:

  • Cell Biology
  • Biochemistry
  • Structural Biology

Background:

  • Integrins are alpha beta heterodimeric adhesion receptors mediating bidirectional signaling between the extracellular matrix and the cell.
  • These receptors are vital for intercellular communication, influencing all aspects of metazoan life.
  • Integrin function is regulated by conformational changes, structural flexibility, and dynamism.

Purpose of the Study:

  • To explore the complexities of integrin structure-function relationships.
  • To review current models and identify key unanswered questions in integrin research.
  • To highlight the importance of three-dimensional structural analysis in understanding integrin regulation.

Main Methods:

  • Review of existing literature on integrin structure and function.
  • Analysis of conformational changes and their role in integrin activation.
  • Discussion of challenges in determining integrin three-dimensional structures.

Main Results:

  • Integrin function is primarily regulated by conformational state changes, not just expression or clustering.
  • Determining integrin structures and their dynamic shape changes is challenging but crucial.
  • Current models of integrin signaling are complex and still evolving.

Conclusions:

  • Integrin structure-function relationships are intricate, with conformational dynamics being central to receptor regulation.
  • Further structural studies are needed to fully elucidate the integrin signaling nexus.
  • Understanding these relationships is essential for comprehending fundamental biological processes.