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Related Concept Videos

Ligand Binding Sites02:40

Ligand Binding Sites

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Proteins are dynamic macromolecules that carry out a wide variety of essential processes; however, the activities of most proteins depend on their interactions with other molecules or ions, known as ligands.
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In animal cells, the extracellular matrix allows cells within tissues to withstand external stresses and transmits signals from the outside of the cell to the inside. The extracellular matrix is extensive, and its composition varies between different types of tissues. For example, the reticular fibers and ground substance make up the ECM in loose connective tissue, while collagen and bone minerals make up the ECM of bone tissue. 
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In multicellular organisms, many molecules transmit signals between cells to pass information. These signals vary in complexity and include small peptides, nucleotides, steroids, fatty acid derivatives, and dissolved gases such as nitric oxide. Some signaling molecules diffuse through the plasma membrane to act locally between neighboring cells or travel long distances. Others remain attached to the cell surface, transmitting information to other cells only when they make contact. In some...
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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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Allosteric proteins have more than one ligand binding site; the binding of a ligand to any of these sites influences the binding of ligands to the other sites. When a protein is allosteric, its binding sites are called coupled or linked.  In the case of enzymes, the site that binds to the substrate is known as the active site and the other site is known as the regulatory site. When a ligand binds to the regulatory site, this leads to conformational changes in the protein that can influence...
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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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Related Experiment Video

Updated: Feb 17, 2026

Fluorescence Biomembrane Force Probe: Concurrent Quantitation of Receptor-ligand Kinetics and Binding-induced Intracellular Signaling on a Single Cell
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Force loading explains spatial sensing of ligands by cells.

Roger Oria1,2, Tina Wiegand3,4, Jorge Escribano5

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Summary

Cells sense their environment by how extracellular matrix (ECM) ligands are spaced. This spacing, not direct measurement, influences cell adhesion and YAP regulation, impacting cellular behavior.

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Area of Science:

  • Cell Biology
  • Biophysics
  • Materials Science

Background:

  • Cells interact with the extracellular matrix (ECM) via integrins to sense physical properties.
  • Previous research suggested cells use nanometer-scale ligand spacing to regulate adhesion, implying a molecular ruler mechanism.
  • Integrin-mediated adhesion and focal adhesion formation are crucial for cellular functions and are influenced by the physical microenvironment.

Purpose of the Study:

  • To investigate how cells sense ECM ligand spacing and substrate rigidity.
  • To elucidate the mechanisms underlying focal adhesion formation and regulation in response to physical cues.
  • To explore the role of ligand distribution and substrate mechanics in YAP transcriptional regulation.

Main Methods:

  • Development of tunable hydrogel substrates with controlled ECM ligand density and spacing.
  • Microscopy techniques to observe focal adhesion dynamics and cell morphology.
  • Computational modeling using an expanded molecular-clutch model to simulate integrin-ECM interactions.
  • Measurement of cellular traction forces and actin flow speeds.

Main Results:

  • Focal adhesion growth is promoted by increased ligand spacing on low-rigidity substrates but leads to adhesion collapse on high-rigidity substrates.
  • Disordered ligand distribution enhances adhesion growth but lowers the rigidity threshold for collapse.
  • YAP (Yes-associated protein) localization (nuclear or cytosolic) correlates with focal adhesion growth and collapse.
  • The molecular-clutch model accurately predicts observed adhesion dynamics based on force loading and integrin recruitment.

Conclusions:

  • Cellular sensing of ECM spatial information is mediated by force-dependent integrin recruitment and redistribution, not direct ligand spacing measurement.
  • Substrate rigidity and ligand distribution interplay to control focal adhesion formation, stability, and YAP-mediated transcriptional regulation.
  • This study provides a framework for understanding nanoscale physical sensing in cells, crucial for diverse biological processes.