Journal
RSC ADVANCES
Volume 8, Issue 4, Pages 2219-2228Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7ra11713b
Keywords
-
Categories
Funding
- Lundbeck Foundation
- Carlsberg Foundation
- Vietnam International Education Development
- Novo Nordisk Foundation
- Lundbeck Foundation [R37-A3457]
- Danish Independent Research Council [0602-02407B]
- UNIK Center for Synthetic Biology
- Lundbeck Foundation [R37-2009-3457] Funding Source: researchfish
Ask authors/readers for more resources
A series of G(s) protein peptidomimetics were designed and synthesised based on the published X-ray crystal structure of the active state beta(2)-adrenergic receptor (beta(2)AR) in complex with the G(s) protein (PDB 3SN6). We hypothesised that such peptidomimetics may function as allosteric modulators that target the intracellular G(s) protein binding site of the beta(2)AR. Peptidomimetics were designed to mimic the 15 residue C-terminal alpha-helix of the G(s) 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 beta(2)AR. 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 beta(2)AR. Overall, the obtained pharmacological data suggest that some of the peptidomimetics may be able to compete with the native G(s) protein for the intracellular binding site to block ISO-induced cAMP formation, but are unable to stabilise an active-like receptor conformation.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available