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Understanding Corticotropin Releasing Factor Receptor (CRFR) Activation Using Structural Models.

Arnau Cordomi1, George Liapakis2, Minos-Timotheos Matsoukas1

  • 1Laboratori de Medicina Computacional, Unitat de Bioestadistica, Facultat de Medicina, Universitat Autonoma de Barcelona, 08193, Bellaterra (Barcelona). Spain.

Current Molecular Pharmacology
|January 21, 2017
PubMed
Summary

Structural insights into corticotropin-releasing factor receptors (CRF1R and CRF2R) reveal conserved functional domains across G protein-coupled receptor families. This comparison aids understanding of secretin-like GPCR activation mechanisms.

Keywords:
ActivationCRF receptorsGPCR structurecorticotropin releasing factorfamily Bmolecular modeling

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Area of Science:

  • Structural Biology
  • Biochemistry
  • Pharmacology

Background:

  • Corticotropin-releasing factor receptors (CRF1R and CRF2R) are Class B1 G protein-coupled receptors (GPCRs) activated by hormones like CRF and urocortins.
  • Previous structural studies focused on the extracellular domains, limiting understanding of transmembrane domain function.
  • Recent crystal structures provide new insights into CRF receptor activation.

Purpose of the Study:

  • To review the current structural landscape of CRF receptors.
  • To explore the activation mechanisms of CRF receptors and other secretin-like GPCRs.
  • To identify analogous microswitches in Class B1 GPCRs by comparing them to Class A rhodopsin receptors.

Main Methods:

  • Analysis of recently released crystal structures of CRF1R and CRF2R transmembrane domains.
  • Structural alignment between secretin-like (Class B1) and rhodopsin (Class A) GPCR families.
  • Review of existing literature on CRF receptor activation and GPCR functional domains.

Main Results:

  • The crystal structure of the human CRF1R transmembrane domain in an inactive state was determined.
  • Structural alignment enabled direct comparison of functional domains between Class A and Class B1 GPCRs.
  • Hypothesized conserved functional domain arrangements and potential analogous microswitches in Class B1 GPCRs.

Conclusions:

  • Structural data on CRF receptors facilitates comparison with other GPCR families.
  • Understanding CRF receptor structure aids in elucidating general secretin-like GPCR activation mechanisms.
  • Identifying conserved functional domains provides a basis for future drug discovery targeting GPCRs.