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Related Concept Videos

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...
G-protein Coupled Receptors01:21

G-protein Coupled Receptors

G-protein coupled receptors are ligand binding receptors that indirectly affect changes in the cell. The actual receptor is a single polypeptide that transverses the cell membrane seven times creating intracellular and extracellular loops. The extracellular loops create a ligand specific pocket which binds to neurotransmitters or hormones. The intracellular loops holds onto the G-protein.
Cooperative Allosteric Transitions01:58

Cooperative Allosteric Transitions

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...
G Protein-coupled Receptors01:15

G Protein-coupled Receptors

G Protein-Coupled Receptors or GPCRs are membrane-bound receptors that transiently associate with heterotrimeric G proteins and induce an appropriate response to sensory stimuli such as light, odors, hormones, cytokines, or neurotransmitters.
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GPCRs Regulate Adenylyl Cylase Activity01:09

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Two...
Transducer Mechanism: G Protein–Coupled Receptors01:30

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G Protein–Coupled Receptors (GPCRs) are membrane-bound receptors that transiently associate with heterotrimeric G proteins and induce an appropriate response to various stimuli. GPCRs regulate critical physiological pathways and are excellent drug targets for treating diseases such as diabetes, cancer, obesity, depression, or Alzheimer's. Nearly 35% of approved drugs implement their therapeutic effects by selectively interacting with specific GPCRs.
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Related Experiment Video

Updated: Jun 26, 2026

Site Directed Spin Labeling and EPR Spectroscopic Studies of Pentameric Ligand-Gated Ion Channels
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An Improved Cysteine-Based Labeling Strategy for GPCR Structural Dynamics Studies.

Jintao Liu1, Ju Yang2, Zhuoqi Wang1

  • 1Beijing Nuclear Magnetic Resonance Center, College of Chemistry and Molecular Engineering & Beijing National Laboratory for Molecular Sciences, Peking University, Beijing, 100871, China.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|October 3, 2025
PubMed
Summary
This summary is machine-generated.

Researchers developed a new method to study G protein-coupled receptors (GPCRs) dynamics. This technique uses phenylarsine oxide (PAO) to protect disulfide bonds, reducing background noise for clearer spectroscopic analysis of receptor signaling.

Keywords:
G protein‐coupled receptordisulfide bonddynamicslabelingmuscarinic receptor

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Area of Science:

  • Biochemistry and Molecular Biology
  • Structural Biology
  • Pharmacology

Background:

  • Studying G protein-coupled receptors (GPCRs) dynamics requires cysteine-based labeling for spectroscopic analysis.
  • A conserved, labile disulfide bond in GPCRs can cause high background signals, obstructing dynamic studies.
  • Existing methods face challenges in accurately assessing GPCR structural dynamics due to signal interference.

Purpose of the Study:

  • To develop an improved strategy for site-specific labeling of muscarinic acetylcholine receptors.
  • To overcome background signal limitations in spectroscopic studies of GPCRs.
  • To enable advanced structural dynamics studies of M2 muscarinic receptor (M2R).

Main Methods:

  • Utilized phenylarsine oxide (PAO) to reversibly protect the conserved disulfide bond in muscarinic acetylcholine receptors.
  • Employed site-specific labeling for both fluorophore and 19F labeling.
  • Applied single-molecule fluorescence resonance energy transfer (smFRET) and 19F nuclear magnetic resonance (NMR) for structural dynamics analysis.

Main Results:

  • Successfully reduced background signals by protecting the labile disulfide bond.
  • Maintained receptor functionality after the labeling and protection process.
  • Enabled detailed structural dynamics studies of the M2 muscarinic receptor (M2R).

Conclusions:

  • The PAO-based strategy offers an efficient method to reduce background noise in GPCR spectroscopic studies.
  • This approach preserves receptor function, allowing for reliable structural dynamics investigations.
  • The improved strategy is expected to enhance the application of cysteine-based spectroscopic techniques across various GPCRs.