超硫化物催化用于氧化和化物代谢
Shingo Kasamatsu1,2, Akira Nishimura1,3, Md Morshedul Alam4,5
1Department of Environmental Medicine and Molecular Toxicology, Tohoku University Graduate School of Medicine, Sendai 980-8575, Japan.
内源超硫化物通过酒精脱酶5 (ADH5) 催化S-尼特罗斯格卢他的新陈代谢. 突变ADH5将其GSNO还原酶和甲脱酶功能分离出来,通过增加NO生物可用性来改善小鼠的心脏功能.
科学领域:
- 生物化学 生物化学
- 酶学 是一种酶学.
- 生理学 生理学 生理学
背景情况:
- 内源超硫化物,包括硫化物种和硫连锁残留物,在生物系统中越来越多地被识别出来.
- 酒精脱酶5 (ADH5) 是一种双功能酶,在S-酸 (GSNO) 代谢和甲排毒中发挥作用.
研究的目的:
- 研究超硫化物在ADH5介导的GSNO代谢中的作用.
- 从生化和表型上分离ADH5.5的双重功能.
主要方法:
- 对ADH5超硫化和酶活性进行生物化学分析.
- 针对ADH5 (C174S) 的局部导向突变发生.
- 在ADH5C174S突变小鼠体内表型的表征.
主要成果:
- 超硫化物催化GSNO代谢通过从化物中依赖谷氨酸的电子转移,利用ADH5.5.
- 在ADH5中发生的C174S突变显著降低了超硫化,并取消了GSNO还原酶活性,同时保留了甲脱酶活性.
- ADH5 C174S突变小鼠表现出改善的心脏功能,与减少GSNO还原酶活性和增加NO生物可用性有关.
结论:
- 在ADH5中的超硫化物形成了GSNO代谢的催化中心,调解了来自的电子转移.
- ADH5的双重功能 (GSNO减少酶和甲脱酶) 可以通过超硫化物催化生物化学分离.
- 向ADH5介导的GSNO代谢为涉及NO信号和心脏功能的疾病提供了潜在的治疗策略.
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