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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.
Protein-ligand interactions are quite specific; even though numerous potential ligands surround a cellular protein at any given time, only a particular ligand can bind to that protein. Moreover, a ligand binds only to a dedicated area on the surface of the protein, known as the...
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Cooperative Allosteric Transitions01:58

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Cooperative allosteric transitions can occur in multimeric proteins, where each subunit of the protein has its own ligand-binding site. When a ligand binds to any of these subunits, it triggers a conformational change that affects the binding sites in the other subunits; this can change the affinity of the other sites for their respective ligands. The ability of the protein to change the shape of its binding site is attributed to the presence of a mix of flexible and stable segments in the...
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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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Ligand Binding and Linkage00:49

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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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Assembly of Signaling Complexes01:30

Assembly of Signaling Complexes

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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
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Diversity of Antigen Receptors01:28

Diversity of Antigen Receptors

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Antigen receptors are essential components of the immune system crucial in defending the body against foreign invaders. These receptors are present on the surface of B and T cells, enabling them to recognize antigens and mount an appropriate immune response.
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Updated: May 28, 2025

Confocal Microscopy Reveals Cell Surface Receptor Aggregation Through Image Correlation Spectroscopy
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Receptor clustering tunes and sharpens the selectivity of multivalent binding.

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Researchers found a physical mechanism to control cellular responses by tuning membrane receptor attraction. This method precisely regulates particle binding and cellular processes like endocytosis for applications such as drug delivery.

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Area of Science:

  • Biophysics
  • Cellular Biology
  • Immunology

Background:

  • The immune system requires precise control over cellular activation for effective responses.
  • Multivalent binding is crucial for cellular processes but often lacks tunable thresholds.
  • Existing mechanisms for regulating cellular responses lack fine-tuned control over activation steepness and location.

Purpose of the Study:

  • To propose a generic physical mechanism for tuning the response threshold of cellular processes activated by multivalent binding.
  • To investigate how modulating interreceptor attraction affects cellular processes.
  • To demonstrate the potential of this mechanism for applications like drug delivery.

Main Methods:

  • Theoretical modeling of receptor-ligand interactions.
  • Computer simulations of particle binding to cell surfaces.
  • Analysis of receptor clustering and density fluctuations.

Main Results:

  • Modulating interreceptor attraction can enhance or suppress multivalent particle binding.
  • Changes in attraction below thermal energy (kT) can switch receptor clustering and activation.
  • Near-critical receptor density fluctuations explain the step-wise switching behavior.

Conclusions:

  • A tunable physical mechanism based on interreceptor attraction controls cellular response thresholds.
  • This mechanism offers precise regulation of cellular processes, including endocytosis.
  • The findings have implications for designing targeted drug delivery systems.