葡萄糖蛋白在活细胞的折叠过程中与氧化降解酶形成混合的二硫化物
1Swiss Federal Institute of Technology Zurich, Institute of Biochemistry.
Nature
|November 26, 1999
概括
蛋白质折叠在内质网膜中涉及至关重要的二硫化物键形成. 这项研究揭示了蛋白质二硫化异构酶 (PDI) 和ERp57在体内直接促进氧化和异构化.
科学领域:
- 生物化学 生物化学
- 分子生物学分子生物学
- 细胞生物学 细胞生物学
背景情况:
- 二硫化键对于内细胞网膜 (ER) 中的分泌和膜蛋白成熟至关重要.
- 蛋白二硫化异构酶 (PDI) 超级家族参与催化二硫化键的形成和异构化.
- 试验室模型表明过渡混合二硫化物是中间体,但它们在ER中的体内相关性仍然不清楚.
研究的目的:
- 阐明哺乳动物ER体内协同和后翻译性蛋白质氧化的体内机制.
- 为了确定在氧化折叠过程中与新合成的蛋白质相互作用的特定PDI超级家族成员.
- 调查ER居住氧化还原酶和莱克在糖蛋白折叠中的作用.
主要方法:
- 在哺乳动物ER体内的蛋白质氧化机制的体内研究.
- 氧化蛋白折叠过程的观察和分析.
- 研究氧化还原酶,莱克和基质蛋白之间的相互作用.
主要成果:
- 证明蛋白质二硫化异构酶 (PDI) 和ERp57在体内直接参与ER蛋白二硫化氧化和异构化.
- 展示了PDI和ERp57在氧化折叠途径中的直接参与.
- 突出了calnexin和calreticulin与PDI和ERp57在糖蛋白折叠中的协作作用.
结论:
- PDI和ERp57是ER中二硫化键的直接氧化和异构的关键参与者.
- 除了PDI和ERp57外,calnexin和calreticulin在ER中对糖蛋白折叠至关重要.
- 这项研究阐明了氧化蛋白折叠的体内机制,确定了特定ER-居民蛋白的直接作用.
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