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Current Medicinal Chemistry

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ISSN (Print): 0929-8673
ISSN (Online): 1875-533X

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Research Article

Comparative Dynamic Features of Apo and Bound MDM2 Protein Reveal the Mechanism of Inhibitor Recognition for Anti-Cancer Activity

Author(s): Aisha I. El habbash, Ahmed El Rashedy and Mahmoud E.S. Soliman*

Volume 30, Issue 10, 2023

Published on: 24 October, 2022

Page: [1193 - 1206] Pages: 14

DOI: 10.2174/0929867329666220610194919

Price: $65

Abstract

Background: Mouse Double Minute 2 Homolog (MDM2) oncogenic protein is the principal cellular antagonist of the p53 tumor suppressor gene. Restoration of p53 activity by inhibiting the MDM2-P53 interactions at the molecular level has become the cornerstone of cancer research due to its promising anticancer effects. Natural medicinal products possess various chemical structures and represent an essential source for drug discovery. α-Mangostin (AM) and gambogic acid (G250) are plant-derived compounds that showed inhibitory effects on MDM2-P53 interactions in vitro and in vivo.

Methods: Despite the many clinical studies which performed deeper insight about the molecular understanding of the structural mechanisms exhibited by α-Mangostin and Gambogic acid-binding to MDM2 remains critical. In this study, comparative molecular dynamics simulations were performed for each Apo and bound p53 and MDM2 proteins to shed light on the MDM2-p53 interactions and get a better understanding of the inhibition mechanisms.

Results: Results revealed atomistic interaction of AM and G250 within the MDM2-p53 interaction cleft. Both compounds mediate the interaction between the α-helix motifs of the p53 amino-terminal domain, which caused a significant separation between orthogonally opposed residues, specifically Lys8 and Gly47 residues of the p53 and MDM2, respectively. Contrasting changes in magnitudes were observed in per-residue fluctuation on AM and G250 (~0.04 nm and ~2.3 nm, respectively). The Radius of gyration (~0.03 nm and 0.04 nm, respectively), C-alpha deviations (~0.06 nm and 0.1 nm, respectively). The phenolic group of AM was found to establish hydrogen interactions with Glu28 and His96 residues of MDM2. The trioxahexacyclo-ring of G250 also forms hydrogen bond interactions with Lys51 and Leu26 residues of MDM2.

Conclusion: Utilizing the information provided on the inhibitory binding mode adopted by each compound in this study may further assist in the tailored designs for cancer therapeutics.

Keywords: MDM2, p53, α-mangostin (AM), gambogic acid (G250), anti-cancer, dynamics simulations.

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