Macrocyclization of an all-D linear α-helical peptide imparts cellular permeability

Macrocyclization of an all-D linear α-helical peptide imparts cellular permeability
Title:
Macrocyclization of an all-D linear α-helical peptide imparts cellular permeability
Other Titles:
Chemical Science
Keywords:
Publication Date:
11 May 2020
Citation:
Chem. Sci., 2020, Advance Article
Abstract:
Peptide-based molecules hold great potential as targeted inhibitors of intracellular protein-protein interactions (PPIs). Indeed, the vast diversity of chemical space conferred through their primary, secondary and tertiary structures allow these molecules to be applied to targets that are typically deemed intractable via small molecules. However, the development of peptide therapeutics has been hindered by their limited conformational stability, proteolytic sensitivity and cell permeability. Several contemporary peptide design strategies are aimed at addressing these issues. Strategic macrocyclization through optimally placed chemical braces such as olefinic hydrocarbon crosslinks, commonly referred to as staples, may improve peptide properties by i) restricting conformational freedom to improve target affinities, ii) improving proteolytic resistance, and iii) enhancing cell permeability. As a second strategy, molecules constructed entirely from D-amino acids are hyper-resistant to proteolytic cleavage, but generally lack conformational stability and membrane permeability. Since neither approach is a complete solution, we have combined these strategies to identify the first examples of all-D α-helical stapled and stitched peptides. As a template, we used a recently reported all D-linear peptide that is a potent inhibitor of the p53-Mdm2 interaction, but is devoid of cellular activity. To design both stapled and stitched all-D-peptide analogues, we used computational modelling to predict optimal staple placement. The resultant novel macrocyclic all D-peptide was determined to exhibit increased α-helicity, improved target binding, complete proteolytic stability and, most notably, cellular activity.
License type:
http://creativecommons.org/licenses/by-nc/4.0/
Funding Info:
The authors thank National Super Computing Centre (NSCC) for computing facilities. This work was supported by a collaborative grant from MSD and A*STAR funded Industry Alignment Pre-Positioning Grants (grant IDs H17/01/a0/010, IAF111213C, H18/01/a0/015).
Description:
ISSN:
2041-6520
2041-6539
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