取代大亚单元N终端使大肠杆菌中的不同植物鲁比斯科生物发生
Zhen Cai1, Lei Zhao1,2, Kailu Ma1,2
1Department of Microbial Physiological & Metabolic Engineering, State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, Beijing, China.
Plant biotechnology journal
|May 30, 2025
概括
在大肠杆菌中的工程工厂核糖-1,5-双酸碳氧化酶/氧化酶 (Rubisco) 现在更容易获得. 研究人员确定了关键的N端残留物,使Rubisco组装成为可能,为提高作物产量铺平了道路.
科学领域:
- 植物生物技术 植物生物技术
- 分子生物学分子生物学
- 生物化学 生物化学
背景情况:
- 通过 ribulose-1,5-bisphosphate carboxylase/oxygenase (Rubisco) 工程来提高植物光合作用效率和作物产量是一个长期以来的目标.
- 植物鲁比斯科的定向进化受到其异质表达和功能组合在诸如大肠杆菌 (Escherichia coli) 等宿主中的挑战的阻碍.
- 之前的方法需要复杂和不可预测的 chaperone 起源的优化,以获得成功的 Rubisco 生物发生.
研究的目的:
- 为了克服异质表达和植物鲁比斯科在大肠杆菌中的功能组合的挑战.
- 通过比较蓝菌和植物鲁比斯科,确定鲁比斯科组装的关键残留物.
- 开发一个更普遍,更简单的平台,用于植物Rubisco生物发生.
主要方法:
- 对蓝菌和植物鲁比斯科的比较序列和结构分析.
- 对E. coli中的Rubisco组件至关重要的N终端大子单元残留物的鉴定.
- 工程仿真工厂Rubiscos通过将特定的N-终端残留物替换为它们的蓝菌对应物.
- 在大肠杆菌中,工程制造的鲁比斯科与阿拉比多普西斯 (Arabidopsis) 的五种辅助沙佩龙包一起表达.
主要成果:
- 几种N端残留的Rubisco大子单元被确定为关键组装在大肠杆菌.
- 将植物鲁比斯科中的这些特定残留物替换为蓝藻细菌版本,以及辅助护卫,使或改进了从多种植物物种 (Flaveria bidentis,Spinacia oleracea,Nicotiana tabacum,Arabidopsis thaliana) 中组装的鲁比斯科.
- 由此产生的仿制植物Rubiscos表现出与其原生酶相匹配的氧化动力学.
结论:
- 鉴定到的N-终端残留物和辅助伴侣的使用为E. coli中的植物鲁比斯科生物发生提供了简化的方法.
- 这一策略可以作为分子工程的基础,以增强Rubisco活动.
- 这些发现有助于开发植物Rubiscos的通用生物发生平台,减少对复杂的陪伴者优化需求.
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