阿拉比多普西斯RMR的RING-finger域作为E3结合酶起作用,对于高尔基后贩运至关重要
Shuai Chen1, Yonglun Zeng2, Hiu Yan Wong1
1Centre for Protein Science and Crystallography, State Key Laboratory of Agrobiotechnology, The Chinese University of Hong Kong, Hong Kong, China.
The Journal of biological chemistry
|September 17, 2025
概括
受体-同质性-跨膜-RING-H2 (RMR) 排序受体使用E3结合酶活性将蛋白质输送到植物存储真空中. 这种E3酶活性对于RMR受体的高尔基后运动至关重要.
科学领域:
- 植物生物学 植物生物学
- 分子和细胞生物学分子和细胞生物学.
- 生物化学 生物化学
背景情况:
- 受体-同质性-跨膜-RING-H2 (RMR) 分类受体对于蛋白质运输至植物蛋白质储存真空至关重要.
- 这些I型整体膜蛋白在其细胞质区域中具有RING-H2域.
研究的目的:
- 为了确定Arabidopsis RMR异形-1 RING-H2域的晶体结构.
- 调查RMR受体的E3结合酶活性及其在蛋白质贩运中的作用.
主要方法:
- 确定阿拉比多普西斯RMR异型-1RING-H2域的晶体结构.
- 在体外无化试验测试以评估E3结合酶活性.
- 对影响E3酶功能的特定突变 (I234Y) 的生物化学分析.
- 对响应突变的受体局部化的分析.
主要成果:
- 晶体结构揭示了协调Zn离子的C3H2C3基因,这是RING型E3结合酶的特征.
- 阿拉比多普西斯RMR异型-1RING-H2域与E2无素结合酶相互作用,并表现出E3结合酶活性.
- 一个特定的突变 (I234Y) 破坏了E2-E3相互作用,并显著降低了E3酶活性.
- E3结合酶活性的非激活导致RMR受体组件的戈尔吉保留.
结论:
- RMR受体的RING-H2域具有重要的E3结合酶活性.
- 这种E3酶活性对于RMR受体的高尔基后贩运至关重要.
- 这些发现为植物中受体介导蛋白质分类提供了新的见解.
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