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Molecular Basis of P131 Cryptosporidial-IMPDH Selectivity—A Structural, Dynamical and Mechanistic Stance

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Abstract

Cryptosporidiosis accounts for a surge in infant (<5 years) mortality and morbidity. To date, several drug discovery efforts have been put in place to develop effective therapeutic options against the causative parasite. Based on a recent report, P131 spares inosine monophosphate dehydrogenase (IMPDH) in a eukaryotic model (mouse IMPDH (mIMPDH)) while binding selectively to the NAD+ site in Cryptosporidium parvum (CpIMPDH). However, no structural detail exists on the underlining mechanisms of P131-CpIMPDH selective targeting till date. To this effect, we investigate the selective inhibitory dynamics of P131 in CpIMPDH relative to mIMPDH via molecular biocomputation methods. Pairwise sequence alignment revealed prominent variations at the NAD+ binding regions of both proteins that accounted for disparate P131 binding activities. The influence of these variations was further revealed by the MM/PBSA energy estimations coupled with per-residue energy decomposition which monitored the systematic binding of the compound. Furthermore, relative high-affinity interactions occurred at the CpIMPDH NAD+ site which were majorly mediated by SER22, VAL24, PRO26, SER354, GLY357, and TYR358 located on chain D. These residues are unique to the parasite IMPDH form and not in the eukaryotic protein, highlighting variations that account for preferential P131 binding. Molecular insights provided herein corroborate previous experimental reports and further underpin the basis of CpIMPDH inhibitor selectivity. Findings from this study could present attractive prospects toward the design of novel anticryptosporidials with improved selectivity and binding affinity against parasitic targets.

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Acknowledgements

Appreciation goes to Center for High Performance Computing, Cape Town, South Africa for providing computational resources.

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  1. Molecular Bio-computation and Drug Design Laboratory, School of Health Sciences, University of KwaZulu-Natal, Westville Campus, Durban, 4001, South Africa

    Kehinde F. Omolabi, Clement Agoni, Fisayo A. Olotu & Mahmoud E. S. Soliman

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  1. Kehinde F. Omolabi
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  2. Clement Agoni
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  3. Fisayo A. Olotu
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  4. Mahmoud E. S. Soliman
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Omolabi, K.F., Agoni, C., Olotu, F.A. et al. Molecular Basis of P131 Cryptosporidial-IMPDH Selectivity—A Structural, Dynamical and Mechanistic Stance. Cell Biochem Biophys 79, 11–24 (2021). https://doi.org/10.1007/s12013-020-00950-1

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