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低温电磁分析揭示了人类SID-1跨膜家族成员1底层脂质水解活性的动态

Yoshinori Hirano¹, Umeharu Ohto¹, Ikuyo Ichi^2,3

¹Graduate School of Pharmaceutical Sciences, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan.

Communications biology

|May 29, 2024

概括

人类SIDT1蛋白,参与RNA运输,具有amidase活性. 胆固醇结合全质调节SIDT1,改变其构造和脂质水解功能,由cryo-EM结构揭示出来.

科学领域:

结构生物学是结构生物学.
分子机制的分子机制
生物化学生物化学

背景情况:

哺乳动物SIDT1/2蛋白与双链RNA (dsRNA) 运输和脂质代谢有关.
它们在dSRNA吸收和胆固醇运输中的确切功能仍然不完全理解.

研究的目的:

阐明人类SIDT1功能的结构基础.
研究胆固醇在调节SIDT1活动和构造中的作用.

主要方法:

使用冷电子显微镜 (cryo-EM) 来确定人类SIDT1.1的结构.
生物化学测试被用来评估SIDT1的酶活性及其通过胆固醇的调节.

主要成果:

冷-EM结构揭示了人类SIDT1作为一个同位体在两个不同的构造:胆固醇结合和不结合.
SIDT1表现出胺酶活性,这种活性因结合胆固醇而减弱.
胆固醇作为一种全调节剂,诱导SIDT1.1的结构变化.

结论:

这项研究揭示SIDT1具有胆固醇调节的amidase活性,影响脂质代谢.
对SIDT1的结构洞察力为了解其在RNA传输和脂质水解中的双重作用提供了基础.
胆固醇的全性调节机制为SID-1家族蛋白质功能提供了新的视角.

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相关概念视频

Cryo-electron Microscopy

Cryo-electron Microscopy

Conventional electron microscopy (EM) involves dehydration, fixation, and staining of biological samples, which distorts the native state of biological molecules and results in several artifacts. Also, the high-energy electron beam damages the sample and makes it difficult to obtain high-resolution images. These issues can be addressed using cryo-EM, which uses frozen samples and gentler electron beams. The technique was developed by Jacques Dubochet, Joachim Frank, and Richard Henderson, for...