酸化MLX稳定了CHREBP-MLX异构四聚体在并联E盒上,以控制碳水化合物和脂质代谢
Carla E Cadena Del Castillo1, Onur Deniz2,3, Femke van Geest1
1Clinical and Experimental Endocrinology, Department of Chronic Diseases and Metabolism, KU Leuven, Leuven, Belgium.
Science advances
|March 12, 2025
概括
对于ChREBP-MLX转录因子复合体来调节糖和脂肪代谢,MLX酸化是必不可少的. 这一过程被高葡萄糖-6-酸盐抑制,影响糖分耐受性和脂质平衡.
科学领域:
- 分子生物学分子生物学
- 调节新陈代谢的规则
- 转录因子 转录因子
背景情况:
- ChREBP-MLX复合体通过与DNA元素结合来调节碳水化合物和脂质代谢.
- 从两个ChREBP-MLX异构体中形成异构体是目标基因表达所需的.
- 控制ChREBP-MLX异构四化及其调节的精确机制尚未完全理解.
研究的目的:
- 为了阐明ChREBP-MLX异构四酶形成的调节机制.
- 为了确定MLX酸化在ChREBP-MLX复合体功能中的作用.
- 研究MLX酸化在代谢调节中的生理意义.
主要方法:
- 对MLX的酸化位点分析.
- 确定MLX激酶 (CK2和GSK3) 的鉴定.
- 在不同的葡萄糖-6-酸盐水平下评估异质四酶的形成和转录活性.
- 在Drosophila体内进行体内研究,以评估糖分耐受性和脂质平衡.
主要成果:
- 在保存的基因上,MLX酸化对ChREBP-MLX异质四酶的形成和转录活性至关重要.
- 氨酸激酶2 (CK2) 和糖原合成激酶3 (GSK3) 被确定为MLX激酶.
- 高水平的葡萄糖-6-酸盐抑制了MLX酸化,损害了异质四酶的形成和ChREBP-MLX活性.
- 酸化MLX对于糖分耐受性和脂质稳定在Drosophila中至关重要.
结论:
- MLX酸化是ChREBP-MLX异构四酶形成的关键调节机制.
- 这种酸化事件对于将细胞内糖水平与碳水化合物和脂质代谢联系起来至关重要.
- 这些发现提供了对代谢调节和潜在治疗点的见解.
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