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Related Concept Videos

Integrins01:10

Integrins

4.8K
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,...
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Activation of Integrins01:15

Activation of Integrins

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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...
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Intracellular Signaling Affects Focal Adhesions01:17

Intracellular Signaling Affects Focal Adhesions

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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...
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Anchoring Junctions01:03

Anchoring Junctions

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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:...
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Fibronectins Connect Cells with ECM01:25

Fibronectins Connect Cells with ECM

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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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Selectins01:25

Selectins

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Cell adhesion is  an essential aspect of multicellularity. While stable cell interactions usually occur between cells of the same type, transient cell interactions occur between cells of different tissue types, such as between neutrophils and endothelial cells. Selectins are one class of cell adhesion molecules (CAMs) that bind carbohydrate ligands to form transient cell adhesion. They are rod-like proteins with a long extracellular part of variable length ending with the lectin domain,...
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Related Experiment Video

Updated: Apr 27, 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

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Structural aspects of integrins.

Robert C Liddington1

  • 1Sanford-Burnham Medical Research Institute, 10901 North Torrey Pines Road, La Jolla, CA, 92037, USA, rlidding@sanfordburnham.org.

Advances in Experimental Medicine and Biology
|July 16, 2014
PubMed
Summary
This summary is machine-generated.

Recent structural studies reveal integrins as dynamic cell surface molecules. Insights into integrin conformations and ligand binding advance our understanding of cellular interactions and signaling pathways.

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Cell Biology

Background:

  • Integrins are crucial cell surface receptors involved in cell adhesion and signaling.
  • Previous research provided limited structural data on integrin conformations and ligand interactions.

Purpose of the Study:

  • To summarize recent advancements in integrin structural biology.
  • To provide a comprehensive overview of integrin structure-function relationships, particularly for α-I domain-containing integrins.

Main Methods:

  • X-ray crystallography to determine high-resolution structures of integrin fragments and complexes.
  • Nuclear Magnetic Resonance (NMR) spectroscopy for transmembrane and cytosolic domains.
  • Cryo-electron microscopy (EM) to study integrins in various activation states.

Main Results:

  • Obtained crystal structures of complete extracellular integrin fragments in open and closed conformations.
  • Determined structures of α-I domains with ligands and intracellular proteins with cytosolic tails.
  • NMR and EM studies provided insights into integrin dynamics and activation states.

Conclusions:

  • Structural data explain previous biochemical and mutagenesis findings.
  • High sequence homology allows modeling of other integrin family members.
  • Integrins exist in a dynamic equilibrium regulated by extracellular and intracellular ligand binding.