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Thiophenacetamide As A Potential Modulator To NF-κB: Structure And Dynamics Study Using In Silico And Molecular Biology Assays

V. S. Silva, F. Vergara, L. N. Seito, D. Antunes, L. H. Santos, M. Henriques, E. Caffarena
Published 2018 · Chemistry, Medicine

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Abstract Nuclear factor kappa B (NF-κB) plays critical roles in the regulation of many pathophysiological processes, including inflammation and immune responses, cell growth and apoptosis. This DNA-binding protein receptor is considered an important molecular target to treat many diseases through host-directed therapy. In this line, several drugs containing thiophene cores have been extensively evaluated due to their ability to interfere on NF-κB translocation to the nucleus. In this work, assays using drug affinity responsive target stability (DARTS) revealed that the parent compound N-(Aryl)-2-thiophen-2-ylacetamide referred to as thiophenacetamide (TAA) specifically binds to the p65 subunit of the NF-κB. Since no experimental binding mode of TAA with p65 is available, we explored TAA within putative sites in silico to gain insights into its possible binding mode and behavior. The binding mode of TAA found in Site 1 formed hydrogen bonds with Lys37 and Asp125 on p65, important residues near DNA-binding region. Molecular dynamics simulations showed the stability of this mode of binding in contrast to the other also tested modes. Our results suggest that TAA binding could occur in regions close to residues responsible for DNA binding, increasing NF-κB protein rigidity and affecting the association between DNA and NF-κB. Communicated by Ramaswamy H. Sarma
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