重回植物的进化:一个Rubisco-null平台验证了高性能祖先酶.
Vishalsingh R Chaudhari1, Myat T Lin1, Kevin M Hines1
1Department of Molecular Biology and Genetics, Cornell University, Ithaca, NY 14853.
概括
研究人员创建了一个Rubisco-null烟草平台来评估工程光合作用酶. 这种系统使得能够评估复活的祖先鲁比斯科,揭示了提高C3作物生产率的催化效率.
科学领域:
- 植物生物学 植物生物学
- 生物化学 生物化学
- 遗传学 遗传学 是一个
背景情况:
- 改善Rubisco,一个关键的光合作用酶,对于提高C3作物的生产力至关重要.
- 由于本地酶干扰,在植物中评估工程化鲁比斯科变种具有挑战性.
研究的目的:
- 在尼科蒂亚纳烟草开发一个Rubisco-null平台,用于在植物中对工程Rubisco变体进行评估.
- 用这个新的系统来评估复活的祖先鲁比斯科的表现.
主要方法:
- 使用CRISPR-Cas9将尼古提亚烟草中的11个核编码小子单元 (rbcS) 基因全部淘汰.
- 开发了一种质体表达系统,用于共表达蓝菌鲁比斯科子单元.
- 两个复活的祖先SolanaceaeRubiscos被表达和动态分析.
主要成果:
- 成功创建了一个可行的Rubisco-null Nicotiana tabacum平台.
- 表达祖先Rubiscos的转基因植物在表型上是正常的,并将Rubisco积累到野生类型的水平.
- 在环境条件下,由于更快的周转率,复活的祖先Rubiscos在环境条件下表现出16-20%更高的催化效率.
结论:
- 开发的平台允许对新的Rubisco变体进行强大的体内评估.
- 祖先酶重建是一个强大的策略,用于识别优越的Rubiscos.
- 这种方法有望改善C3作物的光合作用和生产率.
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