Ligand binding and activation of the CGRP receptor

James Barwell, John Simms, Alex Conner, Debbie Hay, Mark Wheatley, David Poyner*

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingChapter

Abstract

The CGRP receptor is an atypical G-protein coupled receptor (GPCR), consisting of at least three proteins; a Family-B GPCR (calcitonin receptor-like receptor; CLR or CRLR), receptor activity modifying protein 1 (RAMP1) and receptor component protein (RCP). The extracellular domain of RAMP1 is tri-helical and possibly interacts with the extreme N-terminus of CLR to form the functional receptor. CGRP binding probably follows a two-step model of activation. The C-terminus of CGRP interacts with the N-terminus of the CLR/RAMP1 complex and its N-terminus interacts with the extracellular loops and of CLR to cause activation. The second and third extracellular loops are particularly important. During receptor activation TM helices 3 and 6 probably move apart. P343 in TM 6 is particularly important; E233 in TM3 and R173 and/or H178 in TM2 may form intermolecular interactions that may mirror the function of the DRY motif found in Family A GPCRs. Upon receptor activation the intracellular loops move to create a Gs-protein binding pocket.

Original languageEnglish
Title of host publicationThe Calcitonin Gene-related Peptide Family
Subtitle of host publicationForm, Function and Future Perspectives
Pages23-40
Number of pages18
ISBN (Electronic)9789048129096
DOIs
Publication statusPublished - 1 Jan 2010

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Keywords

  • Alanine scan
  • CGRP binding
  • Family B GPCR
  • Molecular modelling
  • RAMP1
  • Receptor activation
  • Site-directed mutagenesis

Cite this

Barwell, J., Simms, J., Conner, A., Hay, D., Wheatley, M., & Poyner, D. (2010). Ligand binding and activation of the CGRP receptor. In The Calcitonin Gene-related Peptide Family: Form, Function and Future Perspectives (pp. 23-40) https://doi.org/10.1007/978-90-481-2909-6_2