米中的小RNA生物发生是由MAP激酶介导的OsCDKD酸化调节的
Dhanraj Singh1, Neetu Verma1, Balakrishnan Rengasamy1
1National Institute of Plant Genome Research, Aruna Asaf Ali Road, New Delhi, 110067, India.
The New phytologist
|September 17, 2024
概括
线素激活蛋白 (MAP) 激酶通过酸化OsCDKD,一个关键的细胞循环调节剂来调节大米细胞分裂. 这种酸化增强了OsCDKD活动,促进了小RNA转录,并对米的生长和发育产生了积极的影响.
科学领域:
- 植物生物学 植物生物学
- 分子生物学分子生物学
- 细胞循环规则 细胞循环规则
背景情况:
- 循环素依赖激酶 (CDKs) 控制细胞分裂,由循环素和 CDK 激活激酶 (CAKs) 调节.
- 在植物细胞循环调节中MAP激酶的作用,特别是与CDK相关的作用,仍然在很大程度上未被探索.
研究的目的:
- 研究MAP激酶 (OsMPK3,OsMPK4,OsMPK6) 在米细胞周期控制中的相互作用和调节作用.
- 阐明MAP激酶调节OsCDKD活动的机制及其对小RNA生物发生和植物发育的下游影响.
主要方法:
- 同免疫沉以确认MAP激酶和OsCDKD/OsCYCH之间的物理相互作用.
- 在体外激酶测试以确定OsCDKD上的酸化位点.
- 分析过度表达线 (野生类型,型,型和酶死亡的OsCDKD) 以评估表型变化.
主要成果:
- 米 MAP 激酶 OsMPK3,OsMPK4 和 OsMPK6 与 OsCDKD 在 Ser-168 和 Thr-235 物理相互作用并酸化 OsCDKD.
- 通过MAPK介导的酸化对于OsCDKD激活至关重要,这是小型RNA生物发生所需的.
- 与野生类型和非功能性OsCDKD变体相比,型OsCDKD过度表达增强了水生长参数 (根生长,植物高度,耕作,和种子数量).
结论:
- 建立了一个新的调节途径,其中MAP激酶在中酸化OsCDKD.
- 通过调节微RNA (miRNA) 转录,MAPK介导的OsCDKD酸化对的生长和发育产生了积极的影响.
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