Synergistic role of Rubisco inhibitor release and degradation in photosynthesis

IF 8.1 1区生物学 Q1 PLANT SCIENCES New Phytologist Pub Date : 2025-01-22 Epub Date: 2024-12-02 DOI:10.1111/nph.20317

Viviana Pasch, Dario Leister, Thilo Rühle

引用次数: 0

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Rubisco抑制剂在光合作用中释放和降解的协同作用

核酮糖-1,5-二磷酸羧化酶/加氧酶（Rubisco）表现出催化乱交性，导致容易出错的反应和抑制性磷酸糖的形成。具体来说，木醛糖-1,5-二磷酸（XuBP）通过结合Rubisco的活性位点作为抑制剂，从而削弱其催化功能。耐热性Rubisco激活酶（Rca）通过重塑Rubisco促进这些抑制剂的释放，包括XuBP。在拟南芥中，磷酸酶对CbbYA和CbbYB随后水解XuBP以阻止其与Rubisco的再结合。为了探索这些成分在维持光合作用中的功能相互作用，我们将cbbya、cbbyb和cbbyab突变体与RCA低敲（RCA -2）系杂交。此外，RCA和CBBYA在野生型（WT）拟南芥中均过表达。表型分析显示，与对照突变体（cbbyab和rca-2）相比，cbbyab rca-2双突变体的生长和光合效率下降加剧，表明存在负遗传相互作用。此外，RCA和CBBYA共同过表达并没有改善短期热胁迫下的光合作用，而且相对于wt，光反应受到不利影响。这些研究结果表明，RCA、CBBYA和CbbYB在维持拟南芥固碳和促进植物生长方面具有协同作用。因此，Rca和CbbY酶的协同调控对优化光合效率至关重要。

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来源期刊

New Phytologist 生物-植物科学

自引率

5.30%

发文量

728

期刊介绍： New Phytologist is an international electronic journal published 24 times a year. It is owned by the New Phytologist Foundation, a non-profit-making charitable organization dedicated to promoting plant science. The journal publishes excellent, novel, rigorous, and timely research and scholarship in plant science and its applications. The articles cover topics in five sections: Physiology & Development, Environment, Interaction, Evolution, and Transformative Plant Biotechnology. These sections encompass intracellular processes, global environmental change, and encourage cross-disciplinary approaches. The journal recognizes the use of techniques from molecular and cell biology, functional genomics, modeling, and system-based approaches in plant science. Abstracting and Indexing Information for New Phytologist includes Academic Search, AgBiotech News & Information, Agroforestry Abstracts, Biochemistry & Biophysics Citation Index, Botanical Pesticides, CAB Abstracts®, Environment Index, Global Health, and Plant Breeding Abstracts, and others.

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