硫醇过氧化酶是一种H2O2受体和基因激活中的氧化还原传感器
Agnès Delaunay1, Delphine Pflieger, Marie Bénédicte Barrault
1Laboratoire Stress Oxydants et Cancers, SBGM, DBJC, CEA-Saclay, 91191 Gif-sur-Yvette, Cedex, France.
Cell
|November 20, 2002
概括
类似谷氨过氧化酶的酶Gpx3作为氧化物传感器,将信号传递给Yap1转录因子,以调节细胞反应. 这揭示了一种新型的真核氧化水感应机制,涉及Gpx3和Yap1.
科学领域:
- * 细胞生物学 细胞生物学
- * 生物化学 * 生物化学
- * 分子生物学 * 分子生物学
背景情况:
- * 转录因子Yap1对于维持Saccharomyces cerevisiae中的氧化水平衡至关重要.
- * Yap1激活是由细胞氧化水平的增加引发的,但直接的氧化机制尚不清楚.
研究的目的:
- *阐明氧化物激活Yap1转录因子的机制.
- * 为了识别到Yap1.1的氧化水信号的传感器和传感器.
主要方法:
- *研究了S. cerevisiae中氧化物,Gpx3和Yap1之间的相互作用.
- *利用生物化学测试来分析二硫化物键的形成和分离.
- * 检查了 thioredoxin 在调节该途径中的作用.
主要成果:
- *Yap1不会被氧化物直接氧化.
- *类似谷氨过氧化酶 (GPx) 的酶Gpx3作为氧化物传感器起作用.
- *Gpx3与Yap1形成了分子间二硫化键,在Yap1中分解为分子内键,表示激活.
- * 硫素通过降低Gpx3和Yap1.1两种途径来禁用该途径.
结论:
- *Gpx3充当氧化受体和氧化还原传感器,介导信号传输到Yap1.
- * 这项研究揭示了一种新的真核生物机制,用于感知和响应氧化物.
- *这些发现突出了GPx类酶在细胞调节中的氧化还原信号作用.
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