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A GPCR that is not "DRY".

Colleen A Flanagan¹

¹Institute of Infectious Disease and Molecular Medicine, Department of Medicine and Division of Medical Biochemistry, University of Cape Town Faculty of Health Sciences, Observatory, South Africa. flanagan@curie.uct.ac.za

Molecular Pharmacology

|April 28, 2005

Summary

The conserved Arg residue in G protein-coupled receptor DRY motifs is not essential for function but stabilizes inactive states. This finding impacts understanding receptor activation mechanisms.

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Area of Science:

Biochemistry
Molecular Pharmacology
Structural Biology

Background:

The DRY motif (Asp-Arg-Tyr) is crucial for rhodopsin-like G protein-coupled receptor (GPCR) activation and G protein interaction.
Both Asp and Arg residues within the DRY motif are believed to be important for receptor conformational changes between inactive and active states.

Discussion:

This study investigates the role of the Arg residue in the DRY motif using the ORF74-EHV2 receptor, which naturally lacks it.
The wild-type ORF74-EHV2 receptor demonstrates constitutive and ligand-induced G protein signaling, indicating functionality without the Arg residue.
Mutagenesis to reintroduce the DRY motif reduced constitutive activity but preserved ligand-inducible function, suggesting a role in stabilizing the inactive conformation.

Key Insights:

The conserved Arg residue in the DRY motif is not strictly required for GPCR function.
GPCRs can be fully functional, exhibiting both constitutive and ligand-induced signaling, in the absence of the DRY motif's Arg residue.
The Arg residue plays a significant role in maintaining the GPCR in its inactive conformation.

Outlook:

Further research can explore the specific structural contributions of the Arg residue to GPCR inactivation.
Investigating other GPCRs for variations in DRY motif conservation could reveal broader principles of receptor regulation.
Understanding the balance between constitutive and ligand-induced activity is key for developing novel therapeutics targeting GPCRs.

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