氨酸67酸化控制呼吸,并限制细胞染色体c的亡功能
Junmei Wan1, Paul T Morse1, Matthew P Zurek1,2
1Center for Molecular Medicine and Genetics, Wayne State University, Detroit, MI 48201, USA.
Cells
|July 11, 2025
概括
在氨酸67 (Y67) 中对细胞染色体c (Cytc) 的酸化抑制了它的功能,减少了细胞呼吸,促进了生存. 这种修改被建议是心脏保护性的.
科学领域:
- 生物化学 生物化学
- 细胞生物学 细胞生物学
- 分子医学是分子医学.
背景情况:
- 细胞染色体c (Cyt c) 对于细胞呼吸和细胞亡至关重要.
- 在Cytc的翻译后的修改会影响其在健康和疾病中的功能.
- 氨酸67 (Y67) 是细胞结构和活性的一个关键残留物.
研究的目的:
- 为了研究Y67酸化在Cyt c.中的功能后果.
- 确定Y67酸化在Cytc与细胞染色体c氧化酶 (COX) 和活性氧物种 (ROS) 的相互作用中的作用.
- 评估Y67酸化对细胞呼吸,细胞亡和生存的影响.
主要方法:
- 质谱测量用于绘制牛心中的Y67酸化Cyt c.
- 局部定向的突变生成产生Y67E (相仿) 和Y67F (控制) 的Cyt c变体.
- 在体外测试以评估COX活性,超氧化物清理,过氧化氧化和心脂氧化酶活性.
- 细胞培养模型检查呼吸,线粒体膜潜力和ROS水平.
主要成果:
- Y67 (Y67E) 的酸化抑制了COX活性,有利于糖解.
- Y67E Cyt c表现出减少的超氧化物清除和受损的电子转移.
- 在Y67E Cyt c. 中,心脂蛋白过氧化酶活性几乎被废除.
- 在细胞中,Y67E替代减少了呼吸,线粒体膜潜力和ROS水平.
结论:
- Y67酸化显著改变了Cytc的功能,影响了电子转移和ROS清理.
- 这种Y67E的相仿变体显示了减少的亲细胞灭绝活性.
- 通过促进细胞存活,Y67酸化可能起到心脏保护作用.
- Y67对Cytc.c.的心脂蛋白过氧化酶活性至关重要.
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