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Title: Structural basis for adhesion G protein-coupled receptor Gpr126 function

Journal Article · · Nature Communications
 [1];  [2];  [1];  [1];  [1];  [1];  [1];  [3]; ORCiD logo [1]
  1. Univ. of Chicago, IL (United States)
  2. Washington Univ. School of Medicine, St. Louis, MO (United States)
  3. Washington Univ. School of Medicine, St. Louis, MO (United States); Oregon Health & Science Univ., Portland, OR (United States)

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.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC); National Institutes of Health (NIH); National Science Foundation Graduate Research Fellowship
Grant/Contract Number:
AC02-06CH11357; 9 P41 GM103622-18; R01-GM120322; R01-NS079445; T32GM007183; DGE-1745038
OSTI ID:
1591910
Journal Information:
Nature Communications, Vol. 11, Issue 1; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
ENGLISH
Citation Metrics:
Cited by: 31 works
Citation information provided by
Web of Science

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