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I03-Macromolecular Crystallography	Diarylethene moiety as an enthalpy-entropy switch: photoisomerizable stapled peptides for modulating p53/MDM2 interaction Alexander V. Strizhak , Oleg Babii , Sergii Afonin , Iuliia Bakanovich , Teodors Pantelejevs , Wenshu Xu , Elaine Fowler , Rohan Eapen , Krishna Sharma , Maxim O. Platonov , Vasyl V. Hurmach , Laura Itzhaki , Marko Hyvonen , Anne S. Ulrich , David R. Spring , Igor V. Komarov Organic & Biomolecular Chemistry 113 DOI: 10.1039/D0OB00831A Diamond Proposal Number(s): [18548] Open Access Show Abstract ▼ Abstract: Analogs of the known inhibitor (peptide pDI) of the p53/MDM2 protein–protein interaction are reported, which are stapled by linkers bearing a photoisomerizable diarylethene moiety. The corresponding photoisomers possess significantly different affinities to the p53-interacting domain of the human MDM2. Apparent dissociation constants are in the picomolar-to-low nanomolar range for those isomers with diarylethene in the “open” configuration, but up to eight times larger for the corresponding “closed” isomers. Spectroscopic, structural, and computational studies showed that the stapling linkers of the peptides contribute to their binding. Calorimetry revealed that the binding of the “closed” isomers is mostly enthalpy-driven, whereas the “open” photoforms bind to the protein stronger due to their increased binding entropy. The results suggest that conformational dynamics of the protein-peptide complexes may explain the differences in the thermodynamic profiles of the binding.	May 2020

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I03-Macromolecular Crystallography

Diarylethene moiety as an enthalpy-entropy switch: photoisomerizable stapled peptides for modulating p53/MDM2 interaction