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Background and Objectives Angiotensin-converting enzyme-related carboxypeptidase, SARS-Coronavirus HR2 Domain, and COVID-19 main protease are essential for the cellular entry and replication of coronavirus in the host. This study investigated the putative inhibitory action of peptides form medicinal mushrooms, namely  Pseudoplectania nigrella ,  Russula paludosa , and  Clitocybe sinopica , towards selected proteins through computational studies. Materials and Methods The respective physicochemical properties of selected peptides were predicted using ProtParam tool, while the binding modes and binding free energy of selected peptides toward proteins were computed through HawkDock server. The structural flexibility and stability of docked protein–peptide complexes were assessed through iMODS server. Results The peptides showed an optimum binding afinity with the molecular targets; plectasin from  P. nigrella  showed the highest binding free energy compared to peptides from  R. paludosa  and  C. sinopica . Besides, molecular dynamic simulations showed all fungal-based peptides could influence the flexibility and stability of selected proteins. Conclusion The study revealed fungal-based peptides could be explored as functional modulators of essential proteins that are involved in the cellular entry of coronavirus.

journal of translational internal medicine

Repositioning of fungal-based peptides as modulators of angiotensin-converting enzyme-related carboxypeptidase, SARS-coronavirus HR2 domain, and coronavirus disease 2019 main protease