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对于LYCHOS的胆固醇感应及其与氧硫酸相互作用的结构基础
Zhenhua Wang1, Jingjing He1, Yufan Yang1
1Department of Cardiology, The First Affiliated Hospital of USTC, MOE Key Laboratory for Membraneless Organelles and Cellular Dynamics, Hefei National Research Center for Interdisciplinary Sciences at the Microscale, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, China.
Nature communications
|March 22, 2025
概括
溶解体胆固醇信号传递 (LYCHOS) 蛋白质结构揭示了它如何感知胆固醇以激活mTORC1.1. 这项研究确定了硫酸作为一种结合联体,为细胞营养物质感应提供了洞察力.
科学领域:
- 细胞生物学 细胞生物学
- 结构生物学 结构生物学
- 生物化学 生物化学
背景情况:
- 溶解体作为营养感应中心,对于激活mTORC1信号至关重要.
- 溶解体胆固醇信号 (LYCHOS) 蛋白是一种已知的胆固醇传感器,将溶解体胆固醇与mTORC1激活联系起来.
- LYCHOS介导的胆固醇感应的精确分子机制仍然没有被阐明.
研究的目的:
- 为了确定人类LYCHOS的冷电子显微镜 (cryo-EM) 结构.
- 为了阐明由LYCHOS感知胆固醇的结构基础.
- 识别潜在的配体,了解它们与LYCHOS.的结合相互作用.
主要方法:
- 低温电子显微镜 (cryo-EM) 用于LYCHOS的高分辨率结构确定.
- 先进的3D分类来识别不同的蛋白质构造状态.
- 与已识别的连接体进行比较结构分析和辅结构确定.
主要成果:
- 人类LYCHOS的3.1 Å冷-EM结构揭示了在透酶-GPCR域界面上的类似胆固醇的密度.
- 确定了两种不同的LYCHOS构造状态,显示了胆固醇依赖的域移动.
- 硫酸 (IS) 被确定为一种结合于LYCHOS.的透酶域的配体.
结论:
- 这项研究提供了LYCHOS的第一个高分辨率结构,揭示了其胆固醇感应机制.
- 对LYCHOS功能的结构洞察力为了解mTORC1通路调节提供了基础.
- 鉴定IS作为一个连接体,表明它在更广泛的细胞信号网络中具有潜在的作用.
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