氧化蛋白折叠是由电子运输系统驱动的
1Department of Biology, University of Michigan, Ann Arbor 48109-1048, USA.
Cell
|July 31, 1999
概括
细胞中二硫化物键的形成与能量生产有关. DsbB酶使用金连接蛋白质折叠与电子运输链,适应各种氧气水平.
科学领域:
- 生物化学 生物化学
- 分子生物学分子生物学
- 细胞的新陈代谢
背景情况:
- 二硫化物键的形成对于蛋白质的折叠和活体中的功能至关重要.
- 这一过程主要由DsbA和DSbB蛋白质催化.
- 连接二硫化物键形成与细胞能量代谢的精确机制仍然不完全理解.
研究的目的:
- 使用纯化的DsbA和DSbB组件,复制和研究体内氧化折叠系统.
- 为了确定驱动蛋白质折叠的氧化功能的来源.
- 阐明二硫化物键形成与细胞代谢途径,特别是电子运输链之间的直接联系.
主要方法:
- 使用纯化的DsbA和DSbB蛋白质,复制二硫化键形成系统.
- 对DsbB的电子受体作用的研究,包括.
- 在不同氧气条件下,通过不同的氧化酶 (cytochrome bo,cytochrome bd) 分析电子流通途径.
- 在无氧条件下检查menaquinone在电子转移到替代受体 (如烟酸) 中的作用.
主要成果:
- 二硫化物键形成与细胞电子运输链直接结合.
- DsbB利用金作为电子受体,使灵活的电子输送通路成为可能.
- 该系统适应不同的氧气可用性,利用特定的氧化酶 (甲基bo有氧化,甲基bd部分无氧化) 或替代的受体 (酸无氧化).
- 净化的组件成功地重建了氧化折叠系统.
结论:
- 由DsbA和DSbB催化的氧化折叠系统与细胞能量代谢紧密结合.
- 与DSbB相关的电子运输通路的灵活性凸显了二硫化物键形成对细胞功能至关重要的重要性.
- 了解这种合提供了关于细胞适应和蛋白质成熟的基本过程的见解.
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