β-基酸盐通过氨酸β-基基基基体代谢作为调节剂,通过氨酸β-基基基基化
Jie Fang1, Zhenghui Hu1, Ting Luo1
1School of Basic Medical Sciences, Jiangxi Medical College, Nanchang University, Nanchang, Jiangxi, PR China.
The Journal of biological chemistry
|April 4, 2025
概括
β-基酸盐 (β-HB) 通过氨酸β-基基化 (Kbhb) 修改调节体代谢. 这项研究确定Kbhb是OXCT1酶活性的关键调节者,维持代谢平衡.
科学领域:
- 生物化学 生化学
- 代谢调节 代谢调节 代谢调节 代谢调节
- 分子生物学分子生物学
背景情况:
- β-基酸盐 (β-HB) 是一种体,具有超出能量供应之外的潜在信号作用.
- β-HB在体代谢调节中的确切参与仍然在很大程度上未被探索.
- lysine β-hydroxybutyrylation (Kbhb) 是一种可能受β-HB水平影响的翻译后修饰.
研究的目的:
- 为了研究β-HB介导的氨酸β-氧丁化 (Kbhb) 在调节体代谢恒常状态中的作用.
- 阐明Kbhb修饰对参与生成和利用的关键酶的影响.
- 确定负责调解代谢中的Kbhb修饰的酶.
主要方法:
- 利用饥饿症和1型糖尿病小鼠模型进行体内研究.
- 进行了体外实验,以评估Kbhb修饰对酶活性的影响.
- 采用质谱和生物化学测试来分析Kbhb修饰和酶动力学.
- 确定了潜在的Kbhb修饰酶,Sirtuin 1 (SIRT1) 和CREB结合蛋白 (CBP).
主要成果:
- OXCT1和HMG-CoA合成酶2的Kbhb修改与体外和体内β-HB水平正相关.
- 酵素修饰水平在禁食期间增加,在重新养时降低.
- 在体外,OXCT1上Kbhb位点的突变显著降低了其酶活性.
- SIRT1和CBP被确定为OXCT1.1的潜在Kbhb脱酶和转移酶.
- 在OXCT1的lysine 421中Kbhb的修改增强了其活性,促进了体的利用.
结论:
- 提出了一种新的体代谢调节机制,涉及Kbhb修改OXCT1.1.
- 在β-HB积累期间,OXCT1的Kbhb修饰对于加速体利用至关重要.
- 这种调节模式有助于维持整体代谢平衡.
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