相关实验视频
Updated: Jun 14, 2025

12:30
Glycan Profiling of Plant Cell Wall Polymers using Microarrays
Published on: December 17, 2012
14.6K
在壁花卡登化物生物合成途径中识别UDP依赖的糖转移酶
Owen S Patrick1, Gordon C Younkin2, Rebecca G Brody1
1Department of Biology, Williams College, Williamstown, Massachusetts, USA.
The Journal of biological chemistry
|May 2, 2025
概括
研究人员确定了两种UDP-依赖的葡萄糖转移酶 (UGTs),UGT73C44和UGT73C45,涉及到Erysimum cheiranthoides中的卡丁诺化物生物合成. 这些酶对于生产植物防御化合物和潜在的人类疗法至关重要.
科学领域:
- 植物生物化学和分子生物学
- 代谢学和自然产品生物合成
- 酶学和蛋白质结构-功能关系.
背景情况:
- 卡迪诺利德是重要的植物防御化合物,具有制药应用,特别是在治疗心力衰竭方面.
- 最近的基因组和转录基因组进步有助于识别卡丁诺利德生物合成途径中的基因.
- 了解卡登化物生物合成是利用它们对人类健康和植物防御的潜力的关键.
研究的目的:
- 通过基因共同表达网络分析,识别参与卡德诺利德生物合成途径的新型酶.
- 描述已识别的UDP依赖型葡萄糖转移酶 (UGTs) 的基质特异性和运动性质.
- 阐明已识别的UGT之间不同基质特异性的结构基础.
主要方法:
- 对Erysimum cheiranthoides发表的转录组数据的基因共同表达网络分析.
- 在体外酶分析以确定UGT73C44和UGT73C45的基质特异性和动力参数 (Km).
- 在植物中验证酶活性和植物遗传学分析,并结合UGT的结构建模.
主要成果:
- 两种依赖于UDP的葡萄糖转移酶,UGT73C44和UGT73C45,被确定为卡丁诺利德生物合成中的关键参与者.
- UGT73C44对氧基因因 (Km = 7.0 μM),一种卡丁诺利德聚糖体,具有较高的特异性,而UGT73C45对基质具有更广泛的特异性.
- 在UGT73C44和UGT73C45的活性部位的结构差异与它们不同的基质偏好有关.
结论:
- 这项研究报告了第一个植物性UGTs,它专门涉及到卡丁诺利德糖化,大大提高了对该途径的理解.
- 已识别的酶,UGT73C44和UGT73C45,为专门的代谢物多样性的调节提供了关键的见解.
- 这些发现为在异质系统中重建卡德诺利德通路并开发新的治疗类型铺平了道路.
相关概念视频
Plant Cell Wall
56.4K
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.
56.4K
Role of Microtubules in Cell Wall Deposition
2.4K
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...
2.4K
C4 Pathway and CAM
45.3K
Most plants use the C3 pathway for carbon fixation. However, some plants, such as sugar cane, corn, and cacti that grow in hot conditions, use alternative pathways to fix carbon and conserve energy loss due to photorespiration. Photorespiration is the process that occurs when the oxygen concentration is high. Under such conditions, the rubisco enzyme in the Calvin cycle binds O2 instead of CO2, which halts photosynthesis and consumes energy.
C4 Pathway
The C4 pathway is used by plants such as...
C4 Pathway
The C4 pathway is used by plants such as...
45.3K
Cell Adhesion in Plants
2.6K
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,...
2.6K
Cellulose and Pectic Polysaccharides
3.5K
Every plant cell has a cell wall that protects the cell, provides structural support, and gives the cell shape. Cellulose, the main structural component of the plant cell wall, makes up over 30% of plant matter. It is the most abundant organic compound on earth. Cellulose is an unbranched polysaccharide composed of linear chains of glucose molecules linked by β (1→4) glycosidic bonds.
As a cell matures, its cell wall specializes according to its type. For example, the...
As a cell matures, its cell wall specializes according to its type. For example, the...
3.5K

