在人类二碳酸盐载体NaDC3中基质转位和抑制
Yan Li1, Jinmei Song1, Vedrana Mikusevic2
1Department of Cell Biology, New York University School of Medicine, New York, NY, USA.
Nature structural & molecular biology
|December 2, 2024
概括
研究人员在多个状态下阐明了人类高亲和二碳酸盐共运输体 (NaDC3) 的结构. 这揭示了它如何结合二碳酸盐,并为开发特定的NaDC3抑制剂提供了洞察力.
科学领域:
- 结构生物学 结构生物学
- 膜运输蛋白质 膜运输蛋白质
- 生物化学 生化学
背景情况:
- 人类的高亲和二碳酸盐共运输体 (NaDC3) 对于细胞吸收重要的代谢中间体和信号分子至关重要.
- 了解NaDC3的基质特异性和抑制机制对于阐明细胞信号和开发向治疗来说至关重要.
研究的目的:
- 确定NaDC3.3中二碳酸盐识别和特异性的结构基础.
- 为了阐明NaDC3抑制的机制.
- 为设计NaDC3特异性抑制剂提供基础.
主要方法:
- 使用冷电子显微镜 (cryo-EM) 确定了NaDC3.3的结构.
- 结构以各种各样的二维形式和三种不同的原质体构造得到解决:向外开放 (Co),向外封闭 (Coo) 和向内开放 (Ci).
- 与相关的载体和抑制剂结合状态进行了结构性比较.
主要成果:
- 该研究揭示了NaDC3结构的向外开放,向外封闭和向内开放状态,捕捉了运输周期的不同阶段.
- 二碳酸盐结合和识别最初发生在向外开放状态,在向外封闭状态下确定进一步的特异性.
- 脚手架域中的氨酸残留物与外向封闭状态的绑定二碳酸盐相互作用,影响运输域的运动.
结论:
- 确定的结构为NaDC3.3的构造变化和基质相互作用提供了前所未有的洞察力.
- 这些发现突出了关键的残留物和相互作用,决定了二碳酸盐的特异性和运输.
- 与其他载体的结构比较为开发NaDC3特异性抑制剂提供了合理的基础.
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