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Cys-loop receptors: new twists and turns
Henry A Lester1, Mohammed I Dibas, David S Dahan
1Division of Biology, California Institute of Technology, Pasadena, CA 91125, USA. lester@caltech.edu
Trends in Neurosciences
|May 29, 2004
Summary
Recent structural insights into Cys-loop receptors prompt new questions about ligand interactions and channel gating mechanisms. This review explores cation-pi interactions and the pathway from binding to gating in nicotinic acetylcholine receptors and related proteins.
Area of Science:
- Neuroscience
- Structural Biology
- Biochemistry
Background:
- Atomic-scale structures of Cys-loop superfamily receptors have been recently elucidated.
- This structural data provides a foundation for new hypotheses and predictions regarding receptor function.
Purpose of the Study:
- To explore the generality of cation-pi interactions between natural ligands and tryptophan residues in the aromatic box.
- To investigate the pathway from the ligand binding site to channel gating.
- To examine conformational changes during receptor gating and desensitization.
Main Methods:
- Review of recent structural and functional studies on Cys-loop receptors.
- Comparative analysis of nicotinic acetylcholine receptors (nAChRs) and other superfamily members.
- Discussion of hypotheses derived from atomic-scale structural data.
Main Results:
- The cation-pi interaction is a key feature between natural ligands and tryptophan residues.
- The pathway from binding to gating involves specific conformational changes.
- Intracellular portals may facilitate ion current flow, a potentially general feature.
Conclusions:
- Recent structural breakthroughs are driving new questions in Cys-loop receptor function.
- Understanding cation-pi interactions and gating pathways is crucial for receptor mechanism.
- Further research is needed to confirm the generality of observed features across the Cys-loop superfamily.