在Camptotheca acuminata中参与camptothecin生物合成的环氧化酸酶的多组学导向采矿和表征
Xiang Pu1, Xin-Yu Lin2, Jin-Wei He2
1College of Science, Sichuan Agricultural University, Ya'an 625104, China; State Key Laboratory for Quality Ensurance and Sustainable Use of Dao-di Herbs, Beijing 100700, China; Featured Medicinal Plants Sharing and Service Platform of Sichuan Province, Ya'an 625104, China.
Bioorganic chemistry
|November 22, 2024
概括
研究人员在Camptotheca acuminata中确定了三种环氧化酶基因 (CaEH1-CaEH3),这些基因对于坎プト素 (CPT) 生物合成至关重要. 这些基因对于关键的2,7-环氧化解水解步骤至关重要,为CPT药物开发提供了新的见解.
科学领域:
- 生物化学 生物化学
- 植物分子生物学 植物分子生物学
- 药物发现 药物发现 药物发现
背景情况:
- 坎普托西因 (CPT) 和其衍生物是重要的细胞毒性和抗瘤剂.
- 控制 Camptotheca acuminata 中 CPT 生物合成中必不可少的 2,7-环氧水解的特定基因仍然未被确定.
- 了解这一步骤是改善CPT生产和开发新型抗癌疗法的关键.
研究的目的:
- 为了识别和描述负责Camptotheca acuminata中camptothecin生物合成中的2,7-环氧解的环氧酶基因.
- 阐明已识别的环氧化酶的酶活性和基质特异性.
- 确认这些基因在整体CPT生物合成途径中的作用.
主要方法:
- 利用Camptotheca acuminata的多种资源进行基因挖掘和选.
- 用于体外酶分析的表达和纯化的复合CaEH蛋白 (CaEH1-CaEH3).
- 在植物中进行功能验证研究,并对已识别的基因进行进化分析.
主要成果:
- 确定了三种新的环氧化酶基因 (CaEH1-CaEH3),参与了2,7-环氧化解步骤.
- 证明这三种CaEH蛋白都在各种基质上表现出环氧化物开放活性,包括氧化物和狭胺环氧化物.
- CaEH1表现出广泛的活性,但具有较差的反选择性,而CaEH2和CaEH3则更喜欢氧化 styrene 的 S-异构体.
- 证实CaEH1-CaEH3共同负责CPT生物合成,在植物组织中表达,并通过融合进化进化.
结论:
- 这项研究成功地确定了关键的环氧化酶基因 (CaEH1-CaEH3),这些基因对Camptotheca acuminata中坎普托西因生物合成至关重要.
- 这些发现揭示了以前未被描述的生物合成步骤,并为增强CPT生产提供了有价值的目标.
- 描述的酶在合成CPT类似物或其他有价值化合物方面具有生物技术应用的潜力.
相关概念视频
01:27C4 Pathway and CAM
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...
01:58Cell Specific Gene Expression
Multicellular organisms contain a variety of structurally and functionally distinct cell types, but the DNA in all the cells originated from the same parent cells. The differences in the cells can be attributed to the differential gene expression. Liver cells, whose functions include detoxification of blood, production of bile to metabolize fats, and synthesis of proteins essential for metabolism, must express a specific set of genes to perform their functions. Gene expression also varies with...