基于TMK的细胞表面辅酶信号激活了细胞壁的酸化
Wenwei Lin1,2, Xiang Zhou1,2, Wenxin Tang1
1FAFU-UCR Joint Center for Horticultural Biology and Metabolomics, Haixia Institute of Science and Technology, Fujian Agriculture and Forestry University, Fuzhou, China.
Nature
|October 28, 2021
概括
转膜激酶 (TMKs) 直接激活血H+-ATPases,这是植物细胞扩张的关键步骤. 这一发现阐明了辅酶信号如何触发植物细胞壁的酸化和生长.
科学领域:
- 植物生物学
- 分子信号
- 细胞生理学
背景情况:
- 植物激素素调节重要的植物过程,包括细胞扩张.
- 酸性生长假设解释了通过细胞壁酸化刺激的细胞扩张,但底层机制尚不清楚.
- 素可以激活血H+-ATPases,但激活过程尚不清楚.
研究的目的:
- 阐明奥克辛激活血H+-ATPases的机制.
- 确定连接auxin感知到H+-ATPase激活的信号通路.
- 研究跨膜激酶 (TMKs) 在辅酶介导的细胞扩张中的作用.
主要方法:
- 在Arabidopsis中进行遗传,生化和分子分析.
- 使用共免疫沉研究TMKs和H+-ATPases之间的相互作用.
- 评估了H+-ATPase的TMK依赖酸化,并测量了皮细胞的延长.
主要成果:
- TMK辅酶信号蛋白与血H+- ATPases直接相互作用.
- 素触发了快速的TMK-H+-ATPase相互作用和TMK-依赖的H+-ATPase的酸化.
- TMKs对于辅酶诱导的H+-ATPase激活,细胞壁酸化和皮细胞延长至关重要.
结论:
- TMKs直接化并激活血H+- ATPases,从而在辅酶信号传递中建立直接联系.
- 这种基于TMK的途径对于辅酶诱导的细胞酸化和植物细胞扩张至关重要.
- 这些发现显示了基于TMK的细胞表面信号作为auxin对植物生长影响的关键调节者.
相关概念视频
Cell Signaling in Plants
5.8K
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...
5.8K
Plant Cell Wall
58.3K
The plant cell wall gives plant cells shape, support, and protection. As a cell matures, its cell wall specializes according to the cell type. For example, the parenchyma cells of leaves possess only a thin, primary cell wall.
58.3K
Tonicity in Plants
56.3K
Tonicity describes the capacity of a cell to lose or gain water. It depends on the quantity of solute that does not penetrate the membrane. Tonicity delimits the magnitude and direction of osmosis and results in three possible scenarios that alter the volume of a cell: hypertonicity, hypotonicity, and isotonicity. Due to differences in structure and physiology, tonicity of plant cells is different from that of animal cells in some scenarios.
56.3K
Role of Microtubules in Cell Wall Deposition
2.7K
Microtubules are small hollow tubes in eukaryotic cells. The cell wall microtubules are polymerized dimers of two globular proteins, α-tubulin and β-tubulin, two globular proteins. With a diameter of about 25 nm, microtubules are the widest components of the cytoskeleton. They help the cell resist compression and provide a track along which vesicles move through the cell or pull replicated chromosomes to opposite ends of a dividing cell. Microtubules go through quick cycles of...
2.7K
Cell Adhesion in Plants
2.9K
Plants have rigid cell walls that are made up of cell wall polysaccharides that mediate cell-cell adhesion. The primary cell walls of plants consist of two independent and interacting polysaccharide networks: a pectin matrix that embeds the second network comprising cellulose and hemicelluloses.
Pectins are complex heteropolymers mainly composed of negatively-charged α-D-glucopyranosyl uronic acid and some neutral glycosyl residues such as α-L-rhamnopyranose, α-L-arabinofuranose,...
Pectins are complex heteropolymers mainly composed of negatively-charged α-D-glucopyranosyl uronic acid and some neutral glycosyl residues such as α-L-rhamnopyranose, α-L-arabinofuranose,...
2.9K
Plant Hormones
25.4K
Plant hormones—or phytohormones—are chemical molecules that modulate one or more physiological processes of a plant. In animals, hormones are often produced in specific glands and circulated via the circulatory system. However, plants lack hormone-producing glands.
25.4K


