Authors
Amit Kumawat, Andrea Perra, Marina Serra, Giorgia Zedda, Marta Anna Kowalik, Andrea Caddeo, Paolo Ruggerone
Published in
The journal of physical chemistry letters. Volume 17. Issue 26. Pages 7267-7273. Jul 02, 2026. Epub Jun 17, 2026.
Abstract
Targeting the oxidative pentose phosphate pathway by inhibiting glucose-6-phosphate dehydrogenase (G6PD) is a promising anticancer strategy, yet clinically useful inhibitors remain unavailable. A key limitation is the lack of molecular insight into how allosteric and noncompetitive inhibitors perturb enzymatic activity, limiting rational optimization. Here, we investigated the mechanism of G6PDi-1, a potent, reversible, noncompetitive G6PD inhibitor, by combining biochemical assays with molecular dynamics simulations, Markov state model, and MM/PBSA binding energy calculations. Experimentally, G6PDi-1 reduced active dimer concentration in hepatoblastoma HepG2 cells and increased the inactive monomer fraction, linking inhibition to disrupted oligomerization. Computationally, we identified multiple sites on the enzyme surface, with preferential binding at the dimer interface that sterically blocks oligomerization. Importantly, additional distal sites showed enhanced inter-residue correlations, suggesting secondary allosteric effects that shift G6PD toward monomeric states less competent for oligomerization. These findings provide a molecular basis for structure-based development of improved strategies for G6PD inhibition suited for cancer therapy.
PMID:
42311042
Bibliographic data and abstract were imported from PubMed on 14 Sep 2026.
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