蛋白质体积聚在植物的细胞质中,在那里它们参与微生物关联分子模式 (MAMP) 触发的病原体防御
Hana Zand Karimi1,2, Kuo-En Chen1, Marilee Karinshak1
1Department of Biology, Washington University in St. Louis, St. Louis, MO, USA.
Nature communications
|February 14, 2025
概括
植物细胞外液含有活性蛋白酶,通过释放微生物相关分子模式 (MAMPs) 来帮助病原体防御. 这些细胞外蛋白酶对植物免疫力和对抗病原体至关重要.
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:
- 植物的细胞增生液 (APF) 与哺乳动物的细胞外液相似,含有蛋白质,RNA和囊泡.
- APF在植物生理学中起着至关重要的作用,包括细胞壁组装和防御反应.
研究的目的:
- 改进阿拉比多普西斯 (Arabidopsis APF.) 的丰富方法.
- 定义APF的组成并识别其中的活性蛋白酶体.
- 为了研究细胞外蛋白质体在植物防御中的功能.
主要方法:
- 开发了一种改进的方法,用于在Arabidopsis中丰富APF.
- 利用显微镜检测,蛋白酶体特异性活性检测,免疫学检测和质谱学.
- 进行了细胞外蛋白质体的功能分析以及它们在植物病原体相互作用中的作用.
主要成果:
- 发现了在APF中丰富的活性蛋白酶,特别是核心蛋白酶.
- 证明了细胞外蛋白酶促进基底病原体防御.
- 表明细胞外蛋白酶释放微生物相关分子模式 (MAMPs),如flg22,诱导反应性氧物种 (ROS) 爆发.
- 鉴定了Pseudomonas syringae中的syringolin-A作为细胞外蛋白酶体活性的抑制剂,抑制鞭毛素触发的ROS.
结论:
- 细胞外蛋白质体是植物质体的关键组成部分.
- 细胞外蛋白质酶通过调节MAMP感知和ROS信号传递,促进植物免疫力.
- 这些发现突出了细胞外蛋白质体在植物病原体军备竞赛中的作用.
相关概念视频
Defenses Against Pathogens and Herbivores
23.0K
Plants present a rich source of nutrients for many organisms, making it a target for herbivores and infectious agents. Plants, though lacking a proper immune system, have developed an array of constitutive and inducible defenses to fend off these attacks.
23.0K
The Proteasome
801
Eukaryotic cells can degrade proteins through several pathways. One of the most important among these is the ubiquitin-proteasome pathway. It helps the cell eliminate the misfolded, damaged, or unwarranted cytoplasmic proteins in a highly specific manner.
In this pathway, the target proteins are first tagged with small proteins called ubiquitin. This involves participation of a series of enzymes including— E1 (ubiquitin-activating enzyme), E2 (ubiquitin-conjugating enzyme), and E3...
In this pathway, the target proteins are first tagged with small proteins called ubiquitin. This involves participation of a series of enzymes including— E1 (ubiquitin-activating enzyme), E2 (ubiquitin-conjugating enzyme), and E3...
801
The Apoplast and Symplast
49.8K
Plant growth depends on its ability to take up water and dissolved minerals from the soil. The root system of every plant is equipped with the necessary tissues to facilitate the entry of water and solutes. The plant tissues involved in the transport of water and minerals have two major compartments - the apoplast and the symplast. The apoplast includes everything outside the plasma membrane of living cells and consists of cell walls, extracellular spaces, xylem, phloem, and tracheids. The...
49.8K
The Proteasome Structure
677
The ubiquitin-proteasome pathway is a well-known mechanism utilized by eukaryotic cells to remove cytoplasmic proteins that are misfolded, damaged, or no longer needed. In this pathway, the protein that needs to be eliminated undergoes a process called ubiquitination, where a chain of ubiquitin molecules is attached to the 48th lysine residue of the target protein. This ubiquitin modification helps the proteasome distinguish between a target protein and a healthy protein.
The proteasome is an...
The proteasome is an...
677
Cell Signaling in Plants
5.6K
Plant cells communicate to coordinate their cycle of growth, flowering and fruiting, and activities in roots, shoots, and leaves in response to the changing environmental conditions. Plant signaling is distinct from animal signaling. Plants primarily utilize enzyme-linked receptors, whereas the largest class of cell-surface receptors in animals are G-protein coupled receptors (GPCRs). Unlike animals, receptor tyrosine kinases are rare in plants. Instead, plants have a diverse class of...
5.6K
Protein Transport to the Outer Chloroplast Membrane
1.9K
Chloroplast outer membrane proteins encoded by the nucleus are synthesized in the cytosol. Soon after synthesis, they bind cytosolic factors such as 14-3-3 protein and the Hsp70 chaperones that keep these precursors in an unfolded state until their translocation.
Two models describe the mechanism of precursor recognition and entry across the outer membrane through the TOC complex. Model 1 suggests the newly synthesized precursor binds to the TOC receptor 159 and forms a complex.
Two models describe the mechanism of precursor recognition and entry across the outer membrane through the TOC complex. Model 1 suggests the newly synthesized precursor binds to the TOC receptor 159 and forms a complex.
1.9K


