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Related Concept Videos

Integrins01:10

Integrins

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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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Intracellular Signaling Affects Focal Adhesions01:17

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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.
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Activation of Integrins01:15

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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."
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Anchoring Junctions01:03

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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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Protein-protein Interfaces02:04

Protein-protein Interfaces

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Many proteins form complexes to carry out their functions, making protein-protein interactions (PPIs) essential for an organism's survival. Most PPIs are stabilized by numerous weak noncovalent chemical forces. The physical shape of the interfaces determines the way two proteins interact. Many globular proteins have closely-matching shapes on their surfaces, which form a large number of weak bonds. Additionally, many PPIs occur between two helices or between a surface cleft and a...
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Related Experiment Video

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Author Spotlight: Development of a Method for Identifying Small Molecular Antagonists of &#946;2 Integrin Activation
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A site for direct integrin αvβ6·uPAR interaction from structural modelling and docking.

Gopichandran Sowmya1, Javed Mohammed Khan1, Samyuktha Anand2

  • 1Department of Chemistry and Biomolecular Sciences, Macquarie University, Sydney, NSW, Australia; ARC Centre of Excellence in Bioinformatics, Macquarie University, Sydney, NSW, Australia.

Journal of Structural Biology
|January 16, 2014
PubMed
Summary

Structural analysis reveals how integrin αvβ6 (a key protein in cancer) binds to urokinase plasminogen activating receptor (uPAR), identifying a specific interaction site for potential cancer therapies.

Keywords:
Integrin heterodimerIntegrin αvβ6Molecular dockingProtein–protein interactionsStructural modellinguPAR

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Structural Biology

Background:

  • Integrin αvβ6 is an epithelial cell surface glycoprotein implicated in cancer progression.
  • It interacts with urokinase plasminogen activating receptor (uPAR), a known factor in cancer.
  • Complete structural data for αvβ6·uPAR interactions is currently lacking.

Purpose of the Study:

  • To structurally analyze the interaction between integrin αvβ6 and uPAR.
  • To identify the specific binding interface between these two molecules.
  • To explore the therapeutic potential of targeting this interaction in cancer.

Main Methods:

  • Utilized computational modeling and docking simulations to analyze αvβ6·uPAR interactions.
  • Integrated previous experimental findings, including immunoprecipitation, mass spectrometry, proximity ligation assays, and peptide arrays.
  • Correlated computational models with existing experimental data to validate findings.

Main Results:

  • Pinpointed the molecular interface between integrin αvβ6 and uPAR through structural analysis.
  • Confirmed that the β-propeller region of the integrin α-chain interacts with uPAR.
  • Identified a specific peptide region in domain III of uPAR as consistent with the proposed 3D interaction site.

Conclusions:

  • The study provides crucial structural insights into the αvβ6·uPAR binding mechanism.
  • The identified interaction site offers a potential target for novel cancer therapeutics.
  • Understanding this molecular interaction is vital for developing targeted cancer management strategies.