期刊
NEW PHYTOLOGIST
卷 205, 期 3, 页码 1250-1263出版社
WILEY
DOI: 10.1111/nph.13097
关键词
alternative oxidase; multiple; selected reaction monitoring (M; SRM); protein phosphatase 2A; proteomics; reactive oxygen species (ROS) signalling
资金
- Academy of Finland [263772, 218157, 259888, 130595, 271832, 123826]
- Finnish Graduate Program in Plant Biology
- University of Turku Graduate School
- Biocentre Finland Proteomics and Metabolomics infrastructure
- Academy of Finland (AKA) [130595, 218157, 263772, 259888, 259888, 123826, 218157, 123826, 130595, 263772] Funding Source: Academy of Finland (AKA)
Organellar reactive oxygen species (ROS) signalling is a key mechanism that promotes the onset of defensive measures in stress-exposed plants. The underlying molecular mechanisms and feedback regulation loops, however, still remain poorly understood. Our previous work has shown that a specific regulatory B subunit of protein phosphatase 2A (PP2A) is required to control organellar ROS signalling and associated metabolic adjustments in Arabidopsis thaliana. Here, we addressed the mechanisms through which PP2A-B impacts on organellar metabolic crosstalk and ROS homeostasis in leaves. Genetic, biochemical and pharmacological approaches, together with a combination of data-dependent acquisition (DDA) and selected reaction monitoring (SRM) MS techniques, were utilized to assess PP2A-B-dependent adjustments in Arabidopsis thaliana. We show that PP2A-B' physically interacts with the cytoplasmic form of aconitase, a central metabolic enzyme functionally connected with mitochondrial respiration, oxidative stress responses and regulation of cell death in plants. Furthermore, PP2A-B' impacts ROS homeostasis by controlling the abundance of specific alternative oxidase isoforms, AOX1A and AOX1D, in leaf mitochondria. We conclude that PP2A-B'-dependent regulatory actions modulate the functional status of metabolic enzymes that essentially contribute to intracellular ROS signalling and metabolic homeostasis in plants.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据