Selenoprotein O Inhibitors

Chemical inhibitors of Selenoprotein O include a variety of compounds that can interfere with its function through different biochemical mechanisms. Auranofin, a gold-containing compound, can inhibit the activity of various selenoenzymes by binding to the selenol-thiol balance within their active sites, which is likely to inhibit Selenoprotein O's enzymatic activity as well. Ethaselen targets the selenocysteine residue within the active site of thioredoxin reductase, and considering the presence of selenocysteine in Selenoprotein O, it can inhibit its activity by a similar mechanism. ML162, as another example, is a covalent inhibitor known to modify the selenocysteine residue in peroxiredoxin, which suggests it can also inhibit Selenoprotein O by covalently modifying its selenocysteine residue.

Pranlukast can reduce oxidative stress and the subsequent peroxidase activity, which is a function of Selenoprotein O, leading to its inhibition. Disulfiram inhibits aldehyde dehydrogenase by forming adducts with cysteine residues and can inhibit Selenoprotein O by binding to its selenocysteine. E64, a cysteine protease inhibitor, forms a thiohemiketal with active site cysteine and can inhibit Selenoprotein O by targeting the selenocysteine in a similar fashion. Spirodiclofen, an inhibitor of acetyl-CoA carboxylase, can disrupt lipid synthesis, potentially disrupting the localization or function of Selenoprotein O, which is associated with lipid droplets. Menadione, by generating reactive oxygen species, can oxidize the selenocysteine of Selenoprotein O, a critical component for its activity. Methimazole, which inhibits thyroid peroxidase, can similarly target the peroxidase activity of Selenoprotein O. Aminotriazole, a catalase inhibitor, can inhibit the peroxidase function of Selenoprotein O by binding to its heme group. Lastly, Pifithrin-α, known to inhibit the p53 protein, can interfere with the p53-dependent stress response pathway, where Selenoprotein O is implicated, leading to its inhibition.