洞察使用分子对接和分子动力学模拟的三种有机污染物对人类和北极熊孕妇X受体的分子识别
Ruige Wang1, Yaqi Lin1, Ying Sun1
1College of Chemistry and Chemical Engineering, Qiqihar University, Qiqihar, 161006, China.
Environment international
|August 4, 2024
概括
北极熊和人类的Pregnane X受体 (PXR) 与有机污染物 (OPs) 相似地相互作用,但OPs独特地改变受体动态,影响结合和特定物种的激活. 这影响了对内分泌干扰物的理解.
科学领域:
- 环境毒理学环境毒理学
- 分子生物学分子生物学
- 生物化学 生物化学
背景情况:
- 孕妇X受体 (PXR) 作为环境污染物的生物传感器,调节排毒基因.
- 有机污染物 (OP) 与北极熊PXR (pbPXR) 和人类PXR (hPXR) 相互作用的方式存在显著差异.
- 这些污染物-PXR相互作用的精确动态特征在很大程度上仍未被阐明.
研究的目的:
- 研究和比较pbPXR和hPXR与特定OP (BPA,chlordane,toxaphene) 的分子识别和动态相互作用.
- 阐明环境污染物对PXR激活的物种特异性的结构基础.
主要方法:
- 采用同质模型来生成pbPXR和hPXR的结构模型.
- 用分子对接和分子动力学模拟来分析PXR-OP相互作用.
- 免费能源计算评估了OPs与PXR两种变体的结合性亲和力.
主要成果:
- 虽然pbPXR和hPXR与研究的OP表现出类似的结合模式,但这些污染物会导致每个受体内部动态的明显变化.
- 关键残留物 (Leu209,Met243,Phe288,Met323,His407) 显示与OP的相互作用发生变化,影响结合能.
- 非极性和范德瓦尔斯相互作用是控制OP与PXR结合的主要作用力,由疏水性接触促进.
结论:
- 有机污染物对北极熊和人类PXR的内部动态产生不同的影响,尽管结合方式相似.
- 这些动态变化对于不同物种中PXRs的选择性激活至关重要.
- 研究结果提供了关于环境内分泌干扰剂对各种生物体的影响的关键见解.
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