假设多氯二苯并对二恶英(PCDDs)通过内分泌干扰对野生动物和人类发挥毒性作用。然而,关于引发这种破坏的潜在分子相互作用的信息很少。在这项研究中,分子对接模拟用于预测12种核受体对PCDD结合破坏的敏感性.研究结果表明,雄激素(AR和ARan),雌激素(ERα和ERβ),糖皮质激素(GR)和甲状腺激素(TRα和TRβ)受体是最可能与PCDD结合的蛋白质靶标。进一步的分子对接分析表明,PCDD分子模拟了受影响受体的共结晶配体观察到的相互作用模式,导致通过静电稳定的配体-受体复合物的形成,范德瓦尔斯,与AR活性位点中18、17、17、16、18、8和4个氨基酸残基的pi效应和疏水相互作用,ARan,ERα,ERβ,GR,分别为TRα和TRβ。这些相互作用的氨基酸残基与AR中二氢睾酮利用的氨基酸残基的共性,比卡鲁胺在ARan,ERα中的17β-雌二醇,ERβ中的17β-雌二醇,GR中的皮质醇,TRα中的拟甲状腺GC-1和TRβ中的拟甲状腺GC-1为86%,74%,94%,80%,82%,分别为50%和43%。这项研究中获得的结果提供了支持证据,证明PCDD分子可能通过与AR结合袋中一些重要氨基酸残基的结合相互作用来干扰内分泌系统。ERs,GR和TR。
Polychlorinated dibenzo-p-dioxins (PCDDs) are hypothesized to exert their toxic effects in wildlife and humans via endocrine disruption. However, very scanty information is available on the underlying molecular interactions that trigger this disruption. In this
study, molecular docking simulation was used to predict the susceptibility of 12 nuclear receptors to disruption via PCDD bindings. Findings revealed that androgen (AR and AR an), estrogen (ER α and ER β), glucocorticoid (GR) and thyroid hormone (TR α and TR β) receptors are the most probable protein targets that bind to PCDDs. Further molecular docking analyses showed that PCDD molecules mimic the modes of interaction observed for the co-crystallized ligands of the affected receptors, resulting in the formation of ligand-receptor complexes that were stabilized through electrostatic, van der Waals, pi-effect and hydrophobic interactions with 18, 17, 17, 16, 18, eight and four amino acid residues in the active sites of AR, AR an, ER α, ER β, GR, TR α and TR β respectively. The commonalities of these interacting amino acid residues with those utilized by dihydrotestosterone in AR, bicalutamide in AR an, 17β-estradiol in ER α, 17β-estradiol in ER β, cortisol in GR, thyromimetic GC-1 in TR α and thyromimetic GC-1 in TR β are 86%, 74%, 94%, 80%, 82%, 50% and 43% respectively. The results obtained in this
study provide supporting evidence that PCDD molecules may interfere with the endocrine system via binding interactions with some vital amino acid residues in the binding pockets of AR, ERs, GRs and TRs.