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Dorgham K, Murail S, Tuffery P, Savier E, Bravo J, Rebollo A. Binding and Kinetic Analysis of Human Protein Phosphatase PP2A Interactions with Caspase 9 Protein and the Interfering Peptide C9h. Pharmaceutics 2022; 14:pharmaceutics14102055. [PMID: 36297489 PMCID: PMC9609871 DOI: 10.3390/pharmaceutics14102055] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2022] [Revised: 09/22/2022] [Accepted: 09/23/2022] [Indexed: 11/16/2022] Open
Abstract
The serine/threonine phosphatase PP2A and the cysteine protease Caspase 9 are two proteins involved in physiological and pathological processes, including cancer and apoptosis. We previously demonstrated the interaction between Caspase 9 and PP2A and identified the C9h peptide, corresponding to the binding site of Caspase 9 to PP2A. This interfering peptide can modulate Caspase 9/PP2A interaction leading to a strong therapeutic effect in vitro and in vivo in mouse models of tumor progression. In this manuscript, we investigate (I) the peptide binding to PP2A combining docking with molecular dynamics and (II) the secondary structure of the peptide using CD spectroscopy. Additionally, we compare the binding affinity, using biolayer interferometry, of the wild-type protein PP2A with Caspase 9 and vice versa to that observed between the PP2A protein and the interfering peptide C9h. This result strongly encourages the use of peptides as new therapeutics against cancer, as shown for the C9h peptide already in clinical trial.
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Affiliation(s)
- Karim Dorgham
- Faculty of Medicine, Sorbonne Université, Inserm, CIMI Paris, 91, bd de l’hôpital, 75013 Paris, France
| | - Samuel Murail
- BFA, Université Paris Cité, Inserm 1133, 75013 Paris, France
| | - Pierre Tuffery
- BFA, Université Paris Cité, Inserm 1133, 75013 Paris, France
| | - Eric Savier
- AP-HP, Sorbonne Université, CRSA, 75013 Paris, France
| | - Jeronimo Bravo
- Instituto de Biomedicina de Valencia IBV-CSIC, Jaime Roig, 11, 46010 Valencia, Spain
| | - Angelita Rebollo
- Faculty of Pharmacy, UTCBS, Université Paris Cité, Inserm 1267, 75006 Paris, France
- Correspondence:
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