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Structural insights into melatonin receptors.

Benjamin Stauch1,2, Linda C Johansson1,2, Vadim Cherezov1,2,3

  • 1Bridge Institute, USC Michelson Center for Convergent Biosciences, University of Southern California, Los Angeles, CA, USA.

The FEBS Journal
|November 7, 2019
PubMed
Summary
This summary is machine-generated.

High-resolution structures of human melatonin receptors MT1 and MT2 reveal unique ligand entry pathways. These findings advance understanding of circadian rhythm and aid in developing targeted insomnia and depression therapies.

Keywords:
G protein-coupled receptorsX-ray free-electron laserchronobiologydiabetesmelatoninserial femtosecond crystallographyserotoninsleeping aids

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Area of Science:

  • Structural Biology
  • Neuroscience
  • Pharmacology

Background:

  • Melatonin receptors (MT1 and MT2) are crucial for circadian rhythm regulation.
  • Understanding their structure is key to developing targeted therapeutics for sleep and mood disorders.

Purpose of the Study:

  • To determine the high-resolution structures of human MT1 and MT2 receptors.
  • To elucidate ligand binding mechanisms and subtype selectivity.
  • To investigate structural bases for drug development and disease associations.

Main Methods:

  • X-ray free-electron laser serial femtosecond crystallography was employed.
  • Structures were determined for MT1 and MT2 receptors in complex with melatonin analogs and drugs.

Main Results:

  • Revealed occluded ligand binding sites with membrane-buried entry channels for both receptors.
  • Identified an additional extracellular ligand entry path in MT2.
  • Mapped type 2 diabetes-related single-nucleotide polymorphisms in MT2, suggesting a role in receptor oligomerization.

Conclusions:

  • The unique ligand entry modes explain receptor specificity and exclusion of similar molecules.
  • Structural insights facilitate the design of selective MT1/MT2 modulators.
  • Provides a foundation for next-generation therapeutics targeting melatonin receptors with improved specificity and reduced side effects.