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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...
Assembly of Signaling Complexes01:30

Assembly of Signaling Complexes

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.
Interaction domains in cell signaling
Interaction domains recognize exposed features of their binding partners containing post-translationally modified sequences,...
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:...
Overview of Cell-Matrix Interactions01:24

Overview of Cell-Matrix Interactions

The extracellular matrix or ECM holds cells together to form a tissue and allows the cells within the tissue to communicate. ECM comprises proteins such as fibronectin, collagen, laminin, etc. The most abundant protein in this space is collagen. Collagen fibers are interwoven with carbohydrate-containing protein molecules called proteoglycans. ECM allows cell migration and provides a structural scaffold at cell adhesion that anchors the cell when the extracellular matrix proteins interact with...

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Related Experiment Video

Updated: Jun 3, 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

Integrin structure, activation, and interactions.

Iain D Campbell1, Martin J Humphries

  • 1Department of Biochemistry, University of Oxford, United Kingdom. iain.campbell@bioch.ox.ac.uk

Cold Spring Harbor Perspectives in Biology
|March 23, 2011
PubMed
Summary
This summary is machine-generated.

Integrins are essential cell adhesion receptors that link the extracellular matrix to the cytoskeleton. Recent structural and functional studies reveal their dynamic activation mechanisms, crucial for cellular responses.

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Titration ELISA as a Method to Determine the Dissociation Constant of Receptor Ligand Interaction
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Last Updated: Jun 3, 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

Efficient Production and Purification of Recombinant Murine Kindlin-3 from Insect Cells for Biophysical Studies
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Titration ELISA as a Method to Determine the Dissociation Constant of Receptor Ligand Interaction
12:38

Titration ELISA as a Method to Determine the Dissociation Constant of Receptor Ligand Interaction

Published on: February 15, 2018

Area of Science:

  • Cell Biology
  • Biochemistry
  • Structural Biology

Background:

  • Integrins are vital heterodimeric transmembrane proteins mediating cell-extracellular matrix interactions.
  • They possess a characteristic 'head-and-legs' structure with extracellular ligand-binding domains and intracellular signaling domains.
  • Integrins are critical for cellular adhesion, migration, and communication within metazoans.

Purpose of the Study:

  • To review recent advancements in understanding integrin structure and function.
  • To highlight the molecular mechanisms underlying integrin activation and signaling.
  • To provide insights into the role of integrins in bridging the extracellular and intracellular environments.

Main Methods:

  • Summary of recent structural biology studies (e.g., X-ray crystallography, cryo-EM).
  • Analysis of molecular functional assays investigating integrin activation.
  • Integration of findings from diverse research on integrin signaling complexes.

Main Results:

  • Detailed insights into the tertiary and quaternary structural changes governing integrin activation.
  • Elucidation of how integrin cytoplasmic domains initiate signaling complex assembly.
  • Demonstration of integrins as dynamic sensors of the pericellular environment.

Conclusions:

  • Integrin structure dictates their function in cell adhesion and signaling.
  • Dynamic structural rearrangements are key to integrin responsiveness.
  • Continued structural and functional studies are essential for understanding integrin roles in health and disease.