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Related Concept Videos

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...
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,...

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

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Published on: June 13, 2014

Reconstructing integrin activation in vitro.

Alexandre R Gingras1, Feng Ye, Mark H Ginsberg

  • 1Department of Medicine, University of California, San Diego, La Jolla, CA, USA.

Methods in Molecular Biology (Clifton, N.J.)
|July 23, 2013
PubMed
Summary
This summary is machine-generated.

Researchers developed a method to study integrin activation using purified proteins in nanodiscs. This system demonstrates that Talin Head Domain binding is key for activating integrins, offering insights into cell adhesion and migration.

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Structural Biology

Background:

  • Integrin activation is crucial for cell adhesion and migration, mediating interactions with the extracellular matrix.
  • Understanding the inside-out activation mechanism of integrins in a controlled system is essential for deciphering cellular processes.

Purpose of the Study:

  • To develop a purified system for studying integrin inside-out activation.
  • To investigate the role of the Talin Head Domain (THD) in integrin activation.

Main Methods:

  • Isolation of inactive platelet αIIbβ3 integrins.
  • Incorporation of integrins into single-integrin-bearing phospholipid nanodiscs.
  • Development of an enzyme-linked immunosorbent assay using the PAC1 antibody to monitor integrin affinity.
  • Utilizing the Talin Head Domain (THD) as an activator.

Main Results:

  • A method was established to monitor integrin affinity changes upon activation in a purified system.
  • Binding of the Talin Head Domain (THD) to both the integrin and the phospholipid bilayer was shown to be necessary and sufficient for activation.
  • Integrin activation and molecular extension were observed in the absence of external force.

Conclusions:

  • The developed nanodisc system provides a platform for studying integrin activation with purified components.
  • The Talin Head Domain (THD) plays a critical role in initiating integrin activation.
  • This methodology can be extended to investigate various integrin-binding proteins, lipids, and integrin types, potentially leading to synthetic adhesion plaque assembly.