绘制由单片氧诱导的α-keto谷氨酸脱酶复合体上的氧化变化的映射:对结构和活性的影响
Qing Gao1, Per Hägglund1, Luke F Gamon1
1Department of Biomedical Sciences, Panum Institute, University of Copenhagen, Copenhagen, 2200, Denmark.
Free radical biology & medicine
|September 19, 2024
概括
单氧氧会破坏α-基酸脱酶复合体,这是克雷布斯循环中的关键酶. 这种氧化损伤通过修改关键氨基酸残留物和辅助因子来损害酶活性.
科学领域:
- 生物化学 生物化学
- 线粒体功能 线粒体功能
- 氧化应激是一种氧化应激.
背景情况:
- 阿尔法-基酸脱酶 (KGDH) 复合体对克雷布斯循环至关重要.
- 它作为氧化剂标的作用和活动丧失的机制尚不清楚.
研究的目的:
- 为了研究由单一氧气诱导的KGDH复合物的氧化变化.
- 确定这些修改对酶活性和结构的影响.
主要方法:
- 使用孟加拉和氧气进行光氧化.
- 酶活性测定. 酶活性测定.
- 质谱法 (LC-MS) 用于识别氧化位点.
- 修改复合物的结构分析.
主要成果:
- 单片氧迅速使KGDH复合体以光和孟加拉依赖的方式失活.
- 氧化发生在45个部位,包括Met,His,Trp,Tyr残留物和酸辅因子.
- 形成的聚合物,以及与氧化产品的形成相关的活性损失.
结论:
- 单一氧会通过氧化特定残留物和辅助因子,损害KGDH的活性.
- 这些发现阐明了对关键代谢酶的氧化损伤机制.
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