ZFIN ID: ZDB-PUB-200112-4
Structural basis for adhesion G protein-coupled receptor Gpr126 function
Leon, K., Cunningham, R.L., Riback, J.A., Feldman, E., Li, J., Sosnick, T.R., Zhao, M., Monk, K.R., AraƧ, D.
Date: 2020
Source: Nature communications   11: 194 (Journal)
Registered Authors: Monk, Kelly
Keywords: none
MeSH Terms:
  • Alternative Splicing
  • Animals
  • Binding Sites
  • Crystallography, X-Ray
  • Drug Design
  • Gene Expression Regulation, Developmental
  • HEK293 Cells
  • Humans
  • Models, Molecular
  • Protein Conformation
  • Protein Domains
  • Receptors, G-Protein-Coupled/chemistry*
  • Receptors, G-Protein-Coupled/genetics*
  • Receptors, G-Protein-Coupled/metabolism*
  • Schwann Cells/metabolism
  • Zebrafish/genetics
  • Zebrafish/metabolism
  • Zebrafish Proteins/chemistry*
  • Zebrafish Proteins/genetics*
  • Zebrafish Proteins/metabolism*
PubMed: 31924782 Full text @ Nat. Commun.
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ABSTRACT
Many drugs target the extracellular regions (ECRs) of cell-surface receptors. The large and alternatively-spliced ECRs of adhesion G protein-coupled receptors (aGPCRs) have key functions in diverse biological processes including neurodevelopment, embryogenesis, and tumorigenesis. However, their structures and mechanisms of action remain unclear, hampering drug development. The aGPCR Gpr126/Adgrg6 regulates Schwann cell myelination, ear canal formation, and heart development; and GPR126 mutations cause myelination defects in human. Here, we determine the structure of the complete zebrafish Gpr126 ECR and reveal five domains including a previously unknown domain. Strikingly, the Gpr126 ECR adopts a closed conformation that is stabilized by an alternatively spliced linker and a conserved calcium-binding site. Alternative splicing regulates ECR conformation and receptor signaling, while mutagenesis of the calcium-binding site abolishes Gpr126 function in vivo. These results demonstrate that Gpr126 ECR utilizes a multi-faceted dynamic approach to regulate receptor function and provide relevant insights for ECR-targeted drug design.
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