Related Experiment Videos
Ultrastructure of the 5-hydroxytryptamine3 receptor
F G Boess1, R Beroukhim, I L Martin
1MRC Molecular Neurobiology Unit, Cambridge, England.
Journal of Neurochemistry
|March 1, 1995
Summary
We visualized the 5-hydroxytryptamine3 (5-HT3) serotonin receptor's structure, revealing a five-subunit arrangement. This finding suggests a common pentameric structure for all ligand-gated ion channels.
Area of Science:
- Neuroscience
- Molecular Biology
- Structural Biology
Background:
- The 5-hydroxytryptamine3 (5-HT3) receptor is a key serotonin-gated ion channel.
- Understanding its structure is crucial for drug development and neuroscience research.
Purpose of the Study:
- To determine the ultrastructure of the 5-HT3 serotonin receptor.
- To investigate the quaternary structure of the 5-HT3 receptor.
Main Methods:
- Purification of 5-HT3 receptors from NG108-15 cells.
- Electron microscopic examination using uranyl acetate stain and metal replicas of rapidly frozen receptors.
Main Results:
- The 5-HT3 receptor was modeled as a cylinder (11 nm length, 8 nm diameter) with a central cavity (3 nm diameter).
- Analysis of rotational symmetry indicated a pentameric arrangement of subunits around the central cavity.
Conclusions:
- The 5-HT3 receptor possesses a pentameric quaternary structure.
- This pentameric structure may be conserved across the ligand-gated ion channel superfamily.