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Decoding Corticotropin-Releasing Factor Receptor Type 1 Crystal Structures.

Andrew S Dore1, Andrea Bortolato1, Kaspar Hollenstein2

  • 1Heptares Therapeutics Ltd, BioPark, Broadwater Road, Welwyn Garden City, Herts, AL7 3AX. United Kingdom.

Current Molecular Pharmacology
|February 11, 2017
PubMed
Summary
This summary is machine-generated.

Structural analysis of the corticotropin-releasing factor receptor type 1 (CRF1R) transmembrane domain reveals how antagonists bind. This provides insights into stress response receptor mechanisms and potential drug development for depression and anxiety.

Keywords:
CP-376395CRF1RGPCRmetadynamicsmolecular dynamicstranslational non-crystallographic symmetry

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Pharmacology

Background:

  • Class B G protein-coupled receptors (GPCRs) are crucial cell surface proteins that bind peptide hormones.
  • Structural studies of these receptors have historically focused on the extracellular domain (ECD).
  • Corticotropin-releasing factor receptor type 1 (CRF1R) is a class B GPCR involved in stress response and is a target for treating depression and anxiety.

Purpose of the Study:

  • To determine the crystal structure of the transmembrane domain (TMD) of human CRF1R.
  • To investigate the binding mechanism of the small-molecule antagonist CP-376395.
  • To elucidate the inactive state of multidomain class B GPCRs.

Main Methods:

  • X-ray crystallography to determine the structure of the CRF1R TMD.
  • Molecular dynamics and metadynamics simulations to analyze ligand binding and receptor dynamics.
  • Modeling of the full-length receptor to study domain interactions.

Main Results:

  • Reported the crystal structure of the human CRF1R TMD bound to antagonist CP-376395.
  • Simulations revealed how the small molecule accesses the allosteric binding site, explaining selectivity over CRF2R.
  • Identified key interactions between the ECD and TMD extracellular loop 3 in the full-length receptor model.

Conclusions:

  • The study provides novel structural insights into class B GPCRs, specifically CRF1R.
  • Understanding the antagonist binding mechanism has implications for developing selective drugs for CRF1R-related disorders.
  • The findings contribute to understanding the inactive state of multidomain GPCRs.