Journal
JOURNAL OF MEDICINAL CHEMISTRY
Volume 62, Issue 24, Pages 11071-11079Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jmedchem.9b00918
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Funding
- Swedish Research Council [201603602]
- Natural Sciences and Engineering Research Council of Canada (NSERC) [04079]
- NSERC
- Canadian Institutes of Health Research (CIHR) [462488]
- Ministere du developpement economique de l'innovation et de l'exportation du Quebec [878-2012]
- Amorchem
- Fonds de recherche nature et technologie Quebec [FRQNT-2020-RS4265155-CCVC]
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Dynamic chirality influences numerous processes in nature from protein folding to catalysis. Azapeptides are peptidomimetics possessing semicarbazide residues that can interconvert between sp(2) and sp(3) hybridization, resulting in stereodynamic interconversions of pseudo-R and -S-configurations by means of a planar intermediate. Cyclic azapeptides have shown unprecedented binding affinity to the cluster of differentiation 36 receptor (CD36) and ability to mitigate macrophage-driven inflammation by modulation of the toll-like receptor 2/6 pathway. A novel approach to synthesize cyclic peptides via A(3)-macrocyclization has been used to make R- and S-configuration controls to study the relevance of semicarbazide hybridization for modulator activity. Nuclear magnetic resonance spectroscopy analysis of potent cyclic azapeptide CD36 modulators (e.g., 1 and 2) and related cyclic peptides demonstrated that binding affinity correlated with conformational rigidity, and a hybridization preference for sp(2) > S- > R-sp(3) semicarbazide nitrogen configuration was evaluated. Evidence of the active conformation and the relevance for dynamic chirality serve as insights for creating cyclic (aza)peptide CD36 modulators to curb inflammation.
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