Receptor component protein, an endogenous allosteric modulator of family B G protein coupled receptors

Abstract

Receptor component protein (RCP) is a 148 amino acid intracellular peripheral membrane protein, previously identified as promoting the coupling of CGRP to cAMP production at the CGRP receptor, a heterodimer of calcitonin receptor like-receptor (CLR), a family B G protein-coupled receptor (GPCR) and receptor activity modifying protein 1 (RAMP1). We extend these observations to show that it selectively enhances CGRP receptor coupling to Gs but not Gq or pERK activation. At other family B GPCRs, it enhances cAMP production at the calcitonin, corticotrophin releasing factor type 1a and glucagon-like peptide type 2 receptors with their cognate ligands but not at the adrenomedullin type 1 (AM1), gastric inhibitory peptide and glucagon-like peptide type 1 receptors, all expressed in transfected HEK293S cells. However, there is also cell-line variability as RCP did not enhance cAMP production at the endogenous calcitonin receptor in HEK293T cells and it has previously been reported that it is active on the AM1 receptor expressed on NIH3T3 cells. RCP appears to behave as a positive allosteric modulator at coupling a number of family B GPCRs to Gs, albeit in a manner that is regulated by cell-specific factors. It may exert its effects at the interface between the 2nd intracellular loop of the GPCR and Gs, although there is likely to be some overlap between this location and that occupied by the C-terminus of RAMPs if they bind to the GPCRs.

Publication DOI: https://doi.org/10.1016/j.bbamem.2019.183174
Divisions: College of Health & Life Sciences > School of Biosciences
College of Health & Life Sciences
College of Health & Life Sciences > Aston Pharmacy School
Additional Information: © 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/BY/4.0/).T Funding: Biotechnology and Biological Sciences Research Council [grant number BB/M000176/2]. Rosetrees foundation; international scholarship from the Cambridge Trust. Aston University 50th Anniversary Prize Fellowship. EPSRC on grant EP/P020232/1 as part of HPC Midlands+ consortium.
Uncontrolled Keywords: Accessory protein,Adrenomedullin,Allosteric modulator,CGRP,G protein coupling,GPCR signalling,Biophysics,Biochemistry,Cell Biology
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Related URLs: https://linking ... 005273619303220 (Publisher URL)
http://www.scop ... tnerID=8YFLogxK (Scopus URL)
PURE Output Type: Article
Published Date: 2020-03-01
Published Online Date: 2019-12-27
Accepted Date: 2019-12-26
Authors: Routledge, Sarah J.
Simms, John (ORCID Profile 0000-0002-4675-0902)
Clark, Ashley
Yeung, Ho Yan
Wigglesworth, Mark J.
Dickerson, Ian M.
Kitchen, Philip (ORCID Profile 0000-0002-1558-4673)
Ladds, Graham
Poyner, David R. (ORCID Profile 0000-0003-1590-112X)

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