种子的长寿是由metacaspases控制的
Chen Liu1,2,3,4, Ioannis H Hatzianestis2,3, Thorsten Pfirrmann5
1State Key Laboratory of Biocontrol, Guangdong Key Laboratory of Plant Resources, School of Life Sciences, Sun Yat-Sen University, 510275, Guangzhou, China.
Nature communications
|August 8, 2024
概括
植物种子通过蛋白质平衡调整来实现长寿. 甲酶II蛋白酶调节CDC48的局部化,这对于丢弃错误折叠的蛋白质和确保在休眠期间的种子存活至关重要.
科学领域:
- 植物生物学 植物生物学
- 分子生物学分子生物学
- 生物化学 生物化学
背景情况:
- 种子的寿命对于生存至关重要,并且依赖于在休眠期间维持蛋白质平衡 (蛋白质平衡).
- 在静止种子中调节蛋白质静止的精确机制在很大程度上是未知的.
研究的目的:
- 研究II型甲酶 (MCA-II) 蛋白酶在种子蛋白质稳定和寿命中的作用.
- 阐明将MCA-II蛋白酶,CDC48和种子中的蛋白质降解联系在一起的分子机制.
主要方法:
- 分析了缺乏所有六个MCA-II蛋白酶的Arabidopsis thaliana遗传突变.
- 评估了种子蛋白质稳定,CDC48在内分泌网膜 (ER) 的定位,以及脂质滴滴动态.
- 研究了MCA-II蛋白酶,PUX10和CDC48之间的相互作用.
主要成果:
- MCA-II突变种子表现出受损的蛋白质稳定,并且未能限制ER中的CDC48因错误折叠的蛋白质清除而受到限制.
- 疾病预防控制中心48的内质网膜局部化取决于MCA-II介导的适应蛋白PUX10.10的裂变.
- 失去MCA-II功能导致PUX10水平发生变化,部分恢复蛋白质稳定并延长种子的寿命.
结论:
- 确定了一种涉及MCA-II蛋白酶,PUX10和CDC48的新型蛋白质分解模块.
- 这个模块调节了时空蛋白解,脂质滴滴动力学和蛋白质稳态,赋予了种子的长寿.
- 了解这些机制为增强种子储存和生存能力提供了潜在的策略.
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