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在β-carboxysome生物生成中通过CcmM形成Rubisco凝结物
1Department of Cellular Biochemistry, Max Planck Institute of Biochemistry, Martinsried, Germany.
Nature
|January 25, 2019
概括
蓝色细菌的碳氧体通过使用 ribo-1,5-bisphosphate carboxylase/oxygenase (Rubisco) 和 CcmM 蛋白来缩二氧化碳. 这项研究显示,
科学领域:
- 生物化学
- 细胞生物学
- 结构生物学
背景情况:
- 细胞分离酶以调节代谢路径并提高效率.
- 菌的碳素体含有Rubisco和碳酸无水酶,可以将二氧化碳缩起来.
- 在两种形式 (M58和M35) 的CcmM蛋白质中,Rubisco聚合物用于碳素体的形成.
研究的目的:
- 阐明鲁比斯科-CcmM复合体形成的结构基础及其在碳素体生物发生中的作用.
- 研究CCMM的小子单位类型 (SSUL) 模块与Rubisco之间的相互作用.
主要方法:
- 复制Rubisco-CcmM复合体
- 使用X射线结晶学或冷EM解决该复合物的高分辨率结构.
- 在体内功能测试以评估二硫化键在SSUL中的作用.
主要成果:
- CcmM的SSUL模块与Rubisco的赤道区域结合,连接分子并诱导类似液态相的分离.
- 与之前的假设相反,SSUL模块不会取代Rubisco小子单元 (RbcS).
- 在SSUL中形成二硫化键增强了网络的灵活性,对体内碳素体的功能至关重要.
结论:
- 通过与CCMM的SSUL域的动态相互作用,Rubisco在碳素体内形成了类似液体的矩阵.
- 这种液态相分离机制与依赖于低复杂度序列的真核系统不同.
- 对于设计植物中的二氧化碳度机制来说,了解体生物发生至关重要.
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