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Insight into the binding theme of CA-074Me to cathepsin B: molecular dynamics simulations and scaffold hopping to identify potential analogues as anti-neurodegenerative diseases

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Abstract

To date, the cause of neurodegeneration is not well understood and diseases that stem from neurodegeneration currently have no known cures. Cathepsin B (CB) enzyme is known to be involved in the production of peptide neurotransmitters and toxic peptides in neurodegenerative diseases. CA-074Me is a membrane-permeable irreversible selective CB inhibitor as confirmed by in vivo studies. Due to the lack of the crystal structure, the binding mode of CA-074Me with the human CB at molecular level has not been previously reported. The main aim of this study is to gain an insight into the binding mode of CB CA-074Me to human CB using various computational tools. Herein, molecular dynamics simulations, binding free energy calculations and per-residue energy decomposition analysis were employed to accomplish the aim of the study. Another objective was to identify novel CB inhibitors based on the structure of CA-074Me using fragment based drug design using scaffold hoping drug design approach. Results showed that two of the designed ligands (hit 1 and hit 2) were found to have better binding affinities than the prototype inhibitor, CA-074Me, by ~2–3 kcal/mol. Per-residue energy decomposition showed that amino acid residues Cys29, Gly196, His197, and Val174 contributed the most toward the binding. The Van der Waals binding forces were found to be the major component of the binding interactions. The findings of this study should assist medicinal chemist toward the design of potential irreversible CB inhibitors.

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Acknowledgments

The authors would like to thank the Center of High Performance Computing (CHPC, Cape Town) for the use of their computational facility, the School of Health Sciences, UKZN, for their financial support, and S. Bharat for his assistance with compound library generation and useful discussions relating to methods and results.

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  1. School of Health Sciences, University of KwaZulu-Natal, Westville, Durban, 4001, South Africa

    Tivani Mashamba-Thompson & Mahmoud E. S. Soliman

  2. Faculty of pharmacy, Zagazig University, Zagazig, Egypt

    Mahmoud E. S. Soliman

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  1. Tivani Mashamba-Thompson
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Correspondence to Mahmoud E. S. Soliman.

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Mashamba-Thompson, T., Soliman, M.E.S. Insight into the binding theme of CA-074Me to cathepsin B: molecular dynamics simulations and scaffold hopping to identify potential analogues as anti-neurodegenerative diseases. Med Chem Res 24, 701–713 (2015). https://doi.org/10.1007/s00044-014-1145-3

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