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Updated: Feb 6, 2026

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Analytical Techniques for Assaying Nitric Oxide Bioactivity
Published on: June 18, 2012
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氧化对[Fe4S4]集群化进行800mV负转移,从而调节内核酶III的氧化活性
Journal of the American Chemical Society
|August 28, 2018
概括
氧化暴露将内核酶III (EndoIII) 中的铁硫转化为铁复合物
科学领域:
- 生物化学和分子生物学
- 生物有机化学
- 电化学
背景情况:
- 内核酶III (EndoIII) 是一种含有[Fe4S4]集群的DNA修复酶.
- 蛋白质中的铁硫团易受氧化物 (NO) 的改变.
- 在DNA修复酶中[Fe4S4]集群化的功能后果尚不清楚.
研究的目的:
- 描述EndoIII中的[Fe4S4]聚合物的化产物.
- 研究化对EndoIII的氧化还原活性和DNA修复功能的影响.
- 阐明通过化影响DNA介导的电荷传输的机制.
主要方法:
- 经过DNA修饰的黄金电化学和蛋白质膜电压测量.
- 电泳运动转移测试 (EMSA).
- 整个和素消化的蛋白质的质谱 (MS).
- 超细次相关性 (HYSCORE) 脉冲电子磁共振 (EPR) 光谱.
主要成果:
- EndoIII的化产生了一种酸铁复合物和一个未报告的鲁辛红色.
- 化EndoIII显示了显著的降解电位负转移 (~-800mV).
- 尽管具有相似的DNA结合亲和力,但EndoIII与DNA结合的氧化还原活性在化时被废除.
结论:
- 内核酶III [Fe4S4] 集群化产生不同的铁化物种.
- 集群化极大地改变了EndoIII的氧化还原特性.
- [Fe4S4]集群的化调节了DNA结合的氧化还原活性和DNA介导的电荷传输.
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