Related Experiment Video
Updated: Jul 7, 2026

The Serial Anesthesia Array for the High-Throughput Investigation of Volatile Agents Using Drosophila melanogaster
Published on: February 24, 2023
Four-alpha-helix bundle with designed anesthetic binding pockets. Part II: halothane effects on structure and
Tanxing Cui1, Vasyl Bondarenko, Dejian Ma
1Department of Anesthesiology, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania 15260, USA.
Volatile anesthetics bind to a protein target, altering its structure and dynamics. This study reveals a novel induced-fit mechanism where halothane binding globally suppresses protein motion, potentially explaining anesthetic action.
Area of Science:
- Biochemistry
- Structural Biology
- Pharmacology
Background:
- The dimeric four-alpha-helix bundle (Aalpha(2)-L1M/L38M)(2) serves as a model for protein targets of volatile anesthetics.
- Previous studies revealed its dynamic nature and a pathway to the hydrophobic core.
Purpose of the Study:
- To determine the high-resolution NMR structure of the anesthetic-bound protein.
- To investigate the binding site and effects of halothane on protein structure and dynamics.
Main Methods:
- High-resolution Nuclear Magnetic Resonance (NMR) spectroscopy.
- NMR binding measurements.
- Quantitative dynamics analyses (Modelfree, Carr-Purcell-Meiboom-Gill transverse relaxation dispersion).
Main Results:
- Halothane binds to an unexpected site, primarily between W15 residues of each monomer.
- Halothane binding induces a shift in the dimer's quaternary structure, closing the access pathway.
- Anesthetic binding suppresses conformational exchange globally, affecting dynamics near and remote from the binding site.
Conclusions:
- A novel induced-fit mechanism is proposed for anesthetic-protein interactions.
- Anesthetic action involves global changes in protein dynamics, not just local effects.
- This mechanism may be broadly applicable to anesthetic action on neuronal proteins.
More Related Videos
08:49Assessing Changes in Volatile General Anesthetic Sensitivity of Mice after Local or Systemic Pharmacological Intervention
Published on: October 16, 2013
14:52Recording Brain Electromagnetic Activity During the Administration of the Gaseous Anesthetic Agents Xenon and Nitrous Oxide in Healthy Volunteers
Published on: January 13, 2018
Related Concept Videos
Inhalational Anesthetics: Overview
Local Anesthetics: Chemistry and Structure-Activity Relationship
¹H NMR of Conformationally Flexible Molecules: Temporal Resolution
Local Anesthetics: Mechanism of Action
Local anesthetics are amphiphilic molecules consisting of a hydrophobic aromatic part linked to a hydrophilic group by an ester or amide linkage. They are weak bases and are usually available as salts, which increases their solubility and stability. Once administered, LAs exist in the body either...
Adrenergic Agonists: Chemistry and Structure-Activity Relationship
Aromatic ring substitutions: Substituting the aromatic ring with –OH groups at positions 3 and 4 yields catecholamines (e.g., epinephrine), which have a high affinity for adrenoceptors. Hydrogen bonding between –OH groups and receptors enhances adrenergic activity.
Separation of the aromatic...
π Electron Effects on Chemical Shift: Overview