化学诱导的多功能阿普里尼克/阿普里米尼克内核酶1的部分展开
Ratan Rai1, Olabode I Dawodu1, Jingwei Meng1,2
1Department of Biochemistry and Molecular Biology, Indiana University School of Medicine, Indianapolis, Indiana, USA.
概括
阿普里尼克/阿普里米尼克内核酶I (APE1) 需要部分展开才能产生氧化还原活性. 抑制剂APX3330诱导可逆展开,揭示了对APE1的洞察力.
科学领域:
- 生物化学 生物化学
- 分子生物学分子生物学
- 结构生物学 结构生物学
背景情况:
- 阿普里尼克/阿普里米尼克内核酶I (APE1) 对于细胞存活至关重要,它既能起到内核酶的作用,也能起到还原因子的作用.
- 这些不同的功能需要APE1的不同构造状态:完全折叠用于内核酶活性,部分展开用于氧化还原活性.
- 反氧化功能涉及暴露Cys65以减少转录因子,增强它们的DNA结合.
研究的目的:
- 阐明APE1在其氧化还原活性期间部分展开背后的分子机制.
- 研究氧化还原抑制剂APX3330和APE1之间的相互作用,重点关注构造变化.
主要方法:
- 使用水LOGSY和1H-15N HSQC NMR光谱学来描述APE1-APX3330相互作用.
- 使用乙醇和乙二作为辅溶剂来诱导和研究构造变化.
- 评估了蛋白质化温度和内核酶活性的变化.
主要成果:
- APX3330结合到APE1的内核酶活性位点和在乙酸中的一个明显的口袋.
- 暴露在乙尼中的APX3330诱导了1H-15N HSQC信号的约35%的时间依赖性损失,表明部分展开.
- 观察到的展开涉及特定的β链,在APX3330被移除后是可逆的;APX3330降低了APE1的化温度,而不影响内核酶活性.
结论:
- 证明APX3330诱导APE1的可逆部分展开,为其氧化还原功能提供了分子基础.
- 这些发现为APX3330.的APE1氧化还原抑制机制提供了洞察力.
- 了解这些结构动态是APE1的生物学作用和治疗向的关键.
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