Constrained Peptides with Fine-Tuned Flexibility Inhibit NF-Y Transcription Factor Assembly.Jeganathan, S., Wendt, M., Kiehstaller, S., Brancaccio, D., Kuepper, A., Pospiech, N., Carotenuto, A., Novellino, E., Hennig, S., Grossmann, T.N.
(2019) Angew.Chem.Int.Ed.Engl. 58: 17351-17358
- PubMed: 31539186
- DOI: 10.1002/anie.201907901
- Primary Citation of Related Structures:
- PubMed Abstract:
Protein complex formation highly depends on the interplay between preorganization and flexibility of involved binding epitopes. The design of epitope mimetics mainly focuses on the stabilization of a particular bioactive conformation often not consid ...
Protein complex formation highly depends on the interplay between preorganization and flexibility of involved binding epitopes. The design of epitope mimetics mainly focuses on the stabilization of a particular bioactive conformation often not considering the conformational dynamics. This limits the potential of peptidomimetics in particular when aiming for challenging targets such as transcription factors. Here, we report the first peptide-derived inhibitor of the NF-Y transcription factor by first constraining the conformation of an epitope using the hydrocarbon stapling approach and then fine-tuning its flexibility. In the initial set of constrained peptides, we observed a severe effect of a single non-interacting α-methyl group on complex stability. The combination of X-ray and NMR structures as well as isothermal titration calorimetry and CD spectroscopy reveal how this methyl group affects the conformation of the peptide in its bound state. Adaption of the methylation pattern results in a peptide which inhibits transcription factor assembly and its subsequent recruitment to the target DNA. These results highlight the importance of residual conformational freedom when constraining protein fragments in their bioactive conformation.
CGC Dortmund, GERMANY.,University of Naples "Federico II", ITALY.,VU University Amsterdam, NETHERLANDS.,University of Naples Federico II, ITALY.,VU Universtity Amsterdam, Chemistry and Pharmaceutical Sciences, De Boelelaan 1108, 1081 HZ, Amsterdam, NETHERLANDS.