人类PRPS2纤维的结构基础
Guang-Ming Lu1, Huan-Huan Hu1, Chia-Chun Chang1
1School of Life Science and Technology, ShanghaiTech University, Shanghai, 201210, China.
人类PRPP合成酶2 (hPRPS2) 在ADP的存在下形成聚合物,这一过程对其功能至关重要. 破坏这种聚合会显著降低了酶.
科学领域:
- 生物化学 生物化学
- 结构生物学 结构生物学
- 酶学 是一种酶学.
背景情况:
- 5糖-1-酸盐 (PRPP) 是一种由PRPP合成酶 (PRPS) 合成的重要代谢物.
- 人类PRPS有三种异型 (hPRPS1,hPRPS2,hPRPS3),其中hPRPS2具有独特的调节性质和癌症相关性.
- PRPS 蛋白质可以聚合成细胞ophidia,这是一种与蛋白质功能相关的机制.
研究的目的:
- 研究人类PRPS2 (hPRPS2) 的功能和聚合机制.
- 确定hPRPS2聚合物的结构基础及其调节.
主要方法:
- 使用冷电子显微镜 (cryo-EM) 来解决hPRPS2.2的聚合物结构.
- 进行了生物化学测试,以评估野生类型和突变hPRPS2.2的催化活性.
- 结构分析的重点是ADP结合和六合体间的相互作用.
主要成果:
- 在3.08 Å分辨率下确定了hPRPS2的六边形结构,揭示了聚合成纤维的聚合.
- 在全和催化位点结合ADP促进hPRPS2六合体堆叠成聚合物.
- 一个特定的点突变破坏了六合体间的接触,取消了聚合,并显著降低了催化活性.
结论:
- 与细菌PRPS (ecPRPS) 相比,hPRPS2聚合的调节方式不同.
- 这项研究提供了通过聚合的hPRPS2调节的结构性见解.
- 这些发现强调了hPRPS2聚合对其酶功能的重要性.
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