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Related Concept Videos

Ligand Binding Sites02:40

Ligand Binding Sites

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...
Ligand Binding Sites02:40

Ligand Binding Sites

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...
Lethal Alleles02:41

Lethal Alleles

Agouti: A Lethal Allele
Lucien Cuénot discovered lethal alleles in 1905 while studying the inheritance of coat color in mice. The agouti gene is responsible for the color of the coat in mice. This gene codes for an agouti-signaling protein, which is responsible for melanin distribution in mammals. The wild-type allele gives rise to gray-brown coat color in mice, while the mutant allele gives rise to yellow coat color. In addition to coat color, the agouti gene is associated with the yellow...
Ligand Binding and Linkage00:49

Ligand Binding and Linkage

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 the...
Ligand Binding and Linkage00:49

Ligand Binding and Linkage

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 the...
Ligand-gated Ion Channels01:19

Ligand-gated Ion Channels

Ligand-gated ion channels are transmembrane proteins with a channel for ions to pass through and a binding site for a ligand. The channel opens only when a ligand attaches to the binding site.
Three Subfamilies of Ligand-gated Ion Channels
Ligand-gated ion channels fall into three subfamilies. The 'Cys-loop' includes the nicotinic acetylcholine receptors, γ-aminobutyric acid (GABA), glycine, and 5-hydroxytryptamine receptors. The second one is the 'Pore-loop' channels that include the...

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Related Experiment Video

Updated: Jun 19, 2026

A Bilingual Computational Workflow for Identifying Potential PLK1 Inhibitors in American Sign Language and English
14:34

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Published on: April 3, 2026

A view to a kill: how ligand quality controls lethal hits.

Stephen C Bunnell1

  • 1Department of Pathology, Tufts University School of Medicine, Boston, MA 02111, USA.

Immunity
|October 17, 2009
PubMed
Summary

Weak immune stimuli can form synapses and polarize microtubules but do not effectively kill targets. This is because they cannot recruit lytic granules to the synaptic cleft for efficient cytotoxic T lymphocyte (CTL) responses.

Area of Science:

  • Immunology
  • Cell Biology
  • Cytotoxic T Lymphocyte (CTL) research

Background:

  • Investigating the requirements for cytotoxic T lymphocyte (CTL) mediated killing.
  • Examining the role of synapse formation and microtubule polarization in immune cell interactions.

Discussion:

  • Weak stimuli initiate synapse formation and microtubule polarization but are insufficient for efficient target cell lysis.
  • The critical limitation appears to be the impaired recruitment of lytic granules to the immunological synapse.

Key Insights:

  • Synapse formation and microtubule polarization are necessary but not sufficient for effective CTL killing.
  • Efficient cytotoxic responses depend on the successful delivery of cytotoxic granules to the target cell interface.

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Last Updated: Jun 19, 2026

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Outlook:

  • Further research into the molecular mechanisms governing lytic granule recruitment is warranted.
  • Understanding these pathways could lead to strategies for enhancing CTL-mediated immunity.