热冲击蛋白调节细胞扩张通过ROS稳态
Shulin Ren1,2,3, Haiyan Wang1,3, Yuling Jiao4,5,6
1College of Life Sciences, Capital Normal University, Beijing, 100048, China.
The New phytologist
|February 6, 2026
概括
热冲击蛋白 (HSP) 调节植物细胞扩张. 一种特定的HSP90辅助子,PpNudC6,通过控制活性氧物种 (ROS) 和细胞壁机制,对的定向细胞生长至关重要.
科学领域:
- 植物生物学 植物生物学
- 分子细胞生物学 分子细胞生物学
- 生物化学 生物化学
背景情况:
- 热冲击蛋白 (HSP) 对细胞过程至关重要,但它们在植物发育中的作用尚未完全理解.
- 定向细胞扩张是植物生长和形态学的基础,需要精确调节细胞壁的特性.
研究的目的:
- 为了研究HSP90辅助器PpNudC6在树Physcomitrium patens中的功能.
- 阐明PpNudC6影响细胞扩张,细胞壁完整性和氧化还原平衡的分子机制.
主要方法:
- 在Physcomitrium patens中产生ppnudc6突变的生成和表型特征.
- 扫描电子显微镜 (SEM) 和原子力显微镜 (AFM) 用于分析细胞壁结构和机制.
- 对活性氧物种 (ROS) 稳态和NADPH氧化酶活性的研究.
- 共同免疫沉用于识别相互作用的蛋白质.
主要成果:
- ppnudc6突变体表现出缩短,加厚的质膜细胞,这是由于纤维素微纤维组织的破坏和细胞壁刚度梯度.
- PpNudC6功能的丧失导致因NADPH氧化酶PpRbohD的异常活动引起的ROS积累.
- 抑制NADPH氧化酶拯救了突变表型,证实了ROS过度生产是发育缺陷的原因.
- PpNudC6与PpRACK1B和PpSGT1相互作用,形成一个可能调节Rboh活动的复合体.
结论:
- PpNudC6 通过调解 ROS 生产和维持细胞壁机械异构性,对的定向细胞扩张至关重要.
- 这项研究揭示了HSP复合体在通过氧化还原平衡和细胞壁机制调节细胞扩张方面发挥的新作用.
- 研究结果提供了关于植物发育过程中伴侣功能,氧化还原平衡和细胞壁动态之间的相互作用的见解.
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