在SLC37A4中的G6P/Pi传输和抑制的结构基础
Dong Zhou1,2, Yang Zhang1, Nanhao Chen2,3
1State Key Laboratory of Membrane Biology, School of Life Sciences, Peking University, Beijing, China.
Nature structural & molecular biology
|November 12, 2025
概括
糖原储存疾病Ib型 (GSD-Ib) 是由SLC37A4载体的突变引起的. 这项研究揭示了SLC37A4的存在.
科学领域:
- 生物化学 生物化学
- 结构生物学 结构生物学
- 分子医学是分子医学.
背景情况:
- 糖原储存疾病Ib型 (GSD-Ib) 是由SLC37A4载体的突变引起的,通过破坏的葡萄糖-6-酸盐 (G6P) /酸盐 (Pi) 抗端口,损害了葡萄糖平衡.
- 对于SLC37A4功能和GSD-Ib病理的结构基础尚不清楚,这阻碍了治疗的发展.
研究的目的:
- 阐明SLC37A4载体运输周期的结构机制和GSD-Ib.中的病理功能障碍.
- 为针对GSD-Ib和相关代谢疾病的有针对性的治疗开发提供结构框架.
主要方法:
- 低温电子显微镜 (cryo-EM) 用于在四种功能状态下确定人类SLC37A4结构.
- 突变分析,分子动力学模拟和功能测试以描述传送机制.
- 使用S-4048进行抑制研究,以探测基质访问和运输通路.
主要成果:
- 确定了SLC37A4在光面和细胞质面状态之间捕捉SLC37A4形状过渡的冷-EM结构.
- 通过静电相互作用和域动态识别了一个保存的基质结合口袋,容纳G6P和Pi.
- 证明,抑制剂S-4048通过将输送器困在细胞质面向的形状中来阻断基质的进入.
结论:
- 阐明了与GSD-Ib相关的SLC37A4突变的分子病理学.
- 提供了SLC37A4运输机制的详细结构见解.
- 为设计针对SLC37A4用于代谢障碍的新疗法建立了结构基础.
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