Structural Basis for Receptor Activity-Modifying Protein-Dependent Selective Peptide Recognition by a G Protein-Coupled Receptor

Overview

Journal Mol Cell

Publisher Cell Press

Specialty Cell Biology

Date 2015 May 19

PMID 25982113

Citations 55

Authors

Jason M Booe

Christopher S Walker

James Barwell

Gabriel Kuteyi

John Simms

Muhammad A Jamaluddin

Margaret L Warner

Roslyn M Bill

Paul W Harris

Margaret A Brimble

David R Poyner

Debbie L Hay

Augen A Pioszak

Affiliations

Soon will be listed here.

Abstract

Association of receptor activity-modifying proteins (RAMP1-3) with the G protein-coupled receptor (GPCR) calcitonin receptor-like receptor (CLR) enables selective recognition of the peptides calcitonin gene-related peptide (CGRP) and adrenomedullin (AM) that have diverse functions in the cardiovascular and lymphatic systems. How peptides selectively bind GPCR:RAMP complexes is unknown. We report crystal structures of CGRP analog-bound CLR:RAMP1 and AM-bound CLR:RAMP2 extracellular domain heterodimers at 2.5 and 1.8 Å resolutions, respectively. The peptides similarly occupy a shared binding site on CLR with conformations characterized by a β-turn structure near their C termini rather than the α-helical structure common to peptides that bind related GPCRs. The RAMPs augment the binding site with distinct contacts to the variable C-terminal peptide residues and elicit subtly different CLR conformations. The structures and accompanying pharmacology data reveal how a class of accessory membrane proteins modulate ligand binding of a GPCR and may inform drug development targeting CLR:RAMP complexes.

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