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Issue 4, 2018
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Gs protein peptidomimetics as allosteric modulators of the β2-adrenergic receptor

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Abstract

A series of Gs protein peptidomimetics were designed and synthesised based on the published X-ray crystal structure of the active state β2-adrenergic receptor (β2AR) in complex with the Gs protein (PDB 3SN6). We hypothesised that such peptidomimetics may function as allosteric modulators that target the intracellular Gs protein binding site of the β2AR. Peptidomimetics were designed to mimic the 15 residue C-terminal α-helix of the Gs protein and were pre-organised in a helical conformation by (i, i + 4)-stapling using copper catalysed azide alkyne cycloaddition. Linear and stapled peptidomimetics were analysed by circular dichroism (CD) and characterised in a membrane-based cAMP accumulation assay and in a bimane fluorescence assay on purified β2AR. Several peptidomimetics inhibited agonist isoproterenol (ISO) induced cAMP formation by lowering the ISO maximal efficacy up to 61%. Moreover, some peptidomimetics were found to significantly decrease the potency of ISO up to 39-fold. In the bimane fluorescence assay none of the tested peptidomimetics could stabilise an active-like conformation of β2AR. Overall, the obtained pharmacological data suggest that some of the peptidomimetics may be able to compete with the native Gs protein for the intracellular binding site to block ISO-induced cAMP formation, but are unable to stabilise an active-like receptor conformation.

Graphical abstract: Gs protein peptidomimetics as allosteric modulators of the β2-adrenergic receptor

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Supplementary files

Article information


Submitted
23 Oct 2017
Accepted
04 Dec 2017
First published
09 Jan 2018

This article is Open Access

RSC Adv., 2018,8, 2219-2228
Article type
Paper

Gs protein peptidomimetics as allosteric modulators of the β2-adrenergic receptor

L. Boyhus, M. Danielsen, N. S. Bengtson, M. Ben Achim Kunze, X. Kubiak, T. J. Sminia, J. H. Løper, P. T. Tran, K. Lindorff-Larsen, S. G. F. Rasmussen, J. M. Mathiesen and D. S. Pedersen, RSC Adv., 2018, 8, 2219
DOI: 10.1039/C7RA11713B

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