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Calcium-activated nonlysosomal neutral proteases, calpains, are believed to be early mediators of neuronal damage associated with neuron death and axonal degeneration after traumatic neural injuries. In this study, a library of biologically active small molecular weight calpain inhibitors was used for model validation and inhibition site recognition. Subsequently, two natural neuroactive polyphenols, curcumin and quercetin, were tested for their sensitivity and activity towards calpain's proteolytic sequence and compared with the known calpain inhibitors via detailed molecular mechanics (MM), molecular dynamics (MD), and docking simulations. The MM and MD energy profiles (SJA6017 &lt; AK275 &lt; AK295 &lt; PD151746 &lt; quercetin &lt; leupeptin &lt; PD150606 &lt; curcumin &lt; ALLN &lt; ALLM &lt; MDL-28170 &lt; calpeptin) and the docking analysis (AK275 &lt; AK295 &lt; PD151746 &lt; ALLN &lt; PD150606 &lt; curcumin &lt; leupeptin &lt; quercetin &lt; calpeptin &lt; SJA6017 &lt; MDL-28170 &lt; ALLM) demonstrated that polyphenols conferred comparable calpain inhibition profiling. The modeling paradigm used in this study provides the first detailed account of corroboration of enzyme inhibition efficacy of calpain inhibitors and the respective calpain-calpain inhibitor molecular complexes' energetic landscape and in addition stimulates the polyphenol bioactive paradigm for post-SCI intervention with implications reaching to experimental in vitro, in cyto, and in vivo studies.

molecules/molecules online/molecules annual

In Silico Affinity Profiling of Neuroactive Polyphenols for Post-Traumatic Calpain Inactivation: A Molecular Docking and Atomistic Simulation Sensitivity Analysis