通过线粒体ES1的新型二碳尼尔代谢途径,具有格里奥沙酶III活性
Ginga Ito1, Yota Tatara2, Ken Itoh2
1Department of Biological Science, Graduate School of Science and Engineering, Iwate University, 4-3-5 Ueda, Morioka, Iwate 020-8551, Japan.
BBA advances
|May 30, 2023
概括
线粒体蛋白ES1表现出glyoxalase III (GLO3) 活性,这对于代谢像glyoxal这样的活性二碳酸至关重要. 这一发现揭示了线粒体内二碳酸代谢的新途径.
科学领域:
- 生物化学 生物化学
- 细胞生物学 细胞生物学
- 线粒体的新陈代谢
背景情况:
- 反应性二碳酸,如糖 (GO) 和甲基糖 (MGO),是通过先进的糖化最终产品形成参与疾病的代谢副产品.
- 线粒体内这些二碳酸的代谢途径尚不清楚.
- 哺乳动物线粒体蛋白ES1被假设是细菌ElbB的同类物,具有glyoxalase III (GLO3) 活性.
研究的目的:
- 研究哺乳动物线粒体蛋白ES1的功能.
- 为了确定ES1是否具有glyoxalase III (GLO3) 活性.
- 阐明ES1在线粒体二碳基代谢中的作用.
主要方法:
- 产生ES1-淘汰赛 (KO) 小鼠和重组小鼠ES1蛋白.
- 来自野生型 (WT) 和ES1-KO小鼠大脑的线粒体部分的生物化学分析.
- 线粒体部分的组织学和蛋白质学分析.
- 检测复合ES1蛋白的催化活性.
主要成果:
- 与WT相比,ES1-KO小鼠大脑中的线粒体碎片显示了显着较低的glyoxal (GO) 代谢和cytochrome c氧化酶活性.
- 在ES1-KO小鼠大脑中,线粒体形态基本保持不变.
- 线粒体蛋白质组分析显示ES1-KO小鼠的MGO降解III途径和氧化酸化蛋白增加.
- 再组合小鼠ES1蛋白在将GO转化为葡萄糖酸方面表现出催化活性.
结论:
- ES1具有甘氨酸酶III (GLO3) 活性,在线粒体内代谢甘氨酸 (GO) 中发挥关键作用.
- ES1调节线粒体二碳基代谢,并与细胞染色体c氧化酶活性有关.
- 这项研究确定了一种新的线粒体途径,用于反应性二碳酸代谢.
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