线粒体质子转移转酶的结构和机制
Domen Kampjut1, Leonid A Sazanov2
1Institute of Science and Technology Austria, Klosterneuburg, Austria.
Nature
|August 30, 2019
概括
质子转移酶 (NNT) 促进化物转移和质子转移. 新的冷电磁结构揭示了它的机制, 开辟了质子通道,
科学领域:
- 生物化学和结构生物学
- 膜蛋白的功能
- 能量转导机制
背景情况:
- 质子转移转酶 (NNT) 对NADPH生成和细胞氧化还原平衡至关重要.
- NNT 缺乏与人类疾病,如家族性糖皮质激素缺乏和II型糖尿病的小鼠模型有关.
- 之前对NNT的催化机制的理解因缺乏高分辨率结构而受到限制.
研究的目的:
- 确定各种形状的完整哺乳动物NNT的高分辨率结构.
- 阐明与化物转移相结合的质子转移机制.
- 了解域间接口在核酸交换和酶功能中的作用.
主要方法:
- 使用冷电子显微镜 (cryo-EM) 来获得完整的哺乳动物NNT结构.
- 分析不同形态状态以可视化动态过程.
- 连接膜和可溶域的界面和连接器的详细结构分析.
主要成果:
- 在不同的形状状态下获得完整的哺乳动物NNT的高分辨率冷EM结构.
- 显示NADP-H结合域可以打开质子通道到膜的对面.
- 具有结构特征的催化重要接口和参与核酸交换的链接器.
结论:
- 建议对NNT的质子转移和化物转移合过程进行修订.
- 这些结构提供了关于如何促进核酸交换的见解.
- 这些发现对于开发具有潜在治疗应用的NNT抑制剂至关重要.
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