The role of ECL2 in CGRP receptor activation: a combined modelling and experimental approach

Michael J. Woolley, Harriet A. Watkins, Bruck Taddese, Z. Gamze Karakullukcu, James Barwell, Kevin J. Smith, Debbie L. Hay, David R. Poyner*, Christopher A. Reynolds, Alex C. Conner

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


The calcitonin gene-related peptide (CGRP) receptor is a complex of a cal-citonin receptor-like receptor (CLR), which is a family B G-protein-coupled receptor (GPCR) and receptor activity modifying protein 1. The role of the second extracellular loop (ECL2) of CLR in binding CGRP and coupling to Gs was investigated using a combination of mutagenesis and modelling. An alanine scan of residues 271-294 of CLR showed that the ability of CGRP to produce cAMP was impaired by point mutations at 13 residues; most of these also impaired the response to adrenomedullin (AM). These data were used to select probable ECL2-modelled conformations that are involved in agonist binding, allowing the identification of the likely contacts between the peptide and receptor. The implications of the most likely structures for receptor activation are discussed. © 2013 The Authors.

Original languageEnglish
Article number20130589
Number of pages11
JournalJournal of the Royal Society Interface
Issue number88
Early online date18 Sept 2013
Publication statusPublished - Nov 2013

Bibliographical note

© 2013 The Authors. Published by the Royal Society under the terms of the Creative Commons Attribution License by/3.0/, which permits unrestricted use, provided the original author and source are credited.

Funding: Wellcome Trust [091496]; New Zealand Heart Foundation; MRC [G1001812]


  • calcitonin gene-related peptide
  • calcitonin receptor-like receptor
  • class B G-protein-coupled receptor
  • loop modelling
  • site-directed mutagenesis


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