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Structural basis for σ1 receptor ligand recognition
Hayden R Schmidt1, Robin M Betz2, Ron O Dror2
1Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Boston, MA, USA.
Nature Structural & Molecular Biology
|October 7, 2018
Summary
Structural insights into the sigma-1 receptor reveal how agonists bind and induce changes, providing a framework for understanding its molecular function in diseases like Alzheimer's.
Area of Science:
- Neuroscience
- Structural Biology
- Pharmacology
Background:
- The sigma-1 receptor is a poorly understood membrane protein with therapeutic potential for neurological disorders.
- Current understanding of its molecular function and ligand interactions is limited.
Purpose of the Study:
- To elucidate the molecular mechanisms of sigma-1 receptor agonism and antagonism.
- To provide structural insights into ligand binding and receptor conformational changes.
Main Methods:
- X-ray crystallography was used to determine the structures of the human sigma-1 receptor bound to specific ligands.
- Molecular dynamics (MD) simulations were employed to analyze ligand binding pathways and receptor dynamics.
Main Results:
- Crystal structures revealed unique binding poses for agonists and antagonists.
- Agonist binding induces significant structural rearrangements in the sigma-1 receptor.
- Ligand binding is a multistep process, rate-limited by receptor conformational changes.
Conclusions:
- The study provides a structural framework for understanding sigma-1 receptor agonism.
- These findings can guide the development of novel therapeutics targeting the sigma-1 receptor for neurological diseases.
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