P型五基重复蛋白YS1和YS2在petB的接中发挥作用,在苗发育过程中维持质质平衡
Hui Sun1, Yanshen Nie1, Li Yu1
1State Key Laboratory of Hybrid Rice, College of Life Sciences, Wuhan University, Wuhan 430072, China.
International journal of molecular sciences
|May 14, 2025
概括
两种大米蛋白,YS1和YS2,对于叶绿体的发育和光合作用至关重要. 它们调节基因拼接,确保适当的苗木生长,防止大米植物死亡.
科学领域:
- 植物分子生物学 植物分子生物学
- 叶绿体生物生成 叶绿体生物生成
- 光合作用法规 光合作用法规
背景情况:
- 五重复蛋白 (PPR) 蛋白对于调节器官基因表达和植物发育至关重要.
- 质细胞基因拼接的精确机制,特别是大米中的psbB-psbT-psbH-petB-petD转录单元,仍然在很大程度上未被阐明.
- 保持叶绿体的功能对于植物的生存和光合作用效率至关重要.
研究的目的:
- 研究两种P型PPR蛋白YS1 (黄色绿色苗木1) 和YS2在米苗木发育中的作用.
- 阐明YS1和YS2调节叶绿体基因表达和拼接的分子机制.
- 了解YS1和YS2对光合作用活动和碳水化合物代谢的影响.
主要方法:
- 对缺乏功能性YS1和YS2基因的米突变的分析.
- 转录组测序以评估全球基因表达变化.
- 生物化学测试以确定蛋白质含量和光合作用活性.
主要成果:
- 失去了YS1和YS2导致甲状腺体崩,光合作用减少,幼苗死亡.
- YS1 和 YS2 直接结合到psbH-petB 基因间区域,促进petB 内子剪接,随后影响petD剪接.
- 突变导致成熟的petB和petD转录减少,PetB和PetD蛋白减少,以及细胞染色体b6/f和光系统I复合体的缺陷,影响电子运输链活动和碳水化合物生产.
结论:
- YS1和YS2是功能冗余的P型PPR蛋白,对苗的发育和光合作用至关重要.
- 这些蛋白质通过确保在五个cystronic转录单元内适当拼接petB内来调节叶绿细胞的恒常性.
- 这些发现扩大了对PPR介导的叶绿体发育的理解,并提供了对植物重复基因的功能作用的见解.
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