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植物根相关酸酶:结构和功能
Samuel O Shobade1,2, Olga A Zabotina1,2, Marit Nilsen-Hamilton1,2
1Ames National Laboratory, U. S. Department of Energy, Ames, IA, United States.
Frontiers in plant science
|February 16, 2024
概括
植物和细菌基因酶的特征是它们在树根球中的作用. 植物基因酶参与对抗真菌病原体的防御,而两者都可能有助于营养物质的循环利用.
科学领域:
- 生物化学 生物化学
- 植物科学 植物科学
- 微生物学 微生物学
背景情况:
- 酸酶降解酸,酸是真菌细胞壁和关节动物外骨架的关键组成部分.
- 这些酶被分泌到树根球中,这是植物微生物营养交换的关键区域.
- 了解基因酶的功能对于阐明植物微生物相互作用至关重要.
研究的目的:
- 模拟,表达,净化和描述来自Zea mays (ZmChi19A) 和Oryza sativa (OsChi19A) 的根基基因酶和来自Chitinophaga oryzae的细菌基因酶 (CspCh18A).
- 为了确定酶对各种基质和黑色阿斯伯菌的活性.
- 确定特定蛋白质域 (CBD,C端域) 在酶功能和真菌生长抑制中的作用.
主要方法:
- 酶的表达,净化和表征.
- 使用4-MU-GlcNAc3基质进行动态分析.
- 测定pH值和温度的最佳值.
- 结构建模和ZmChi19A.的局部定向突变发生.
- 用Aspergillus niger进行酶活性测定.
主要成果:
- ZmChi19A和OsChi19A属于GH19家族;CspCh18A属于GH18家族.
- 这三种酶对4-MU-GlcNAc3.3具有相似的表面Km值.
- 酶显示出不同的pH值和最佳温度.
- C终端域对溶性基质的活性至关重要,而CBD和C终端域对于抑制真菌生长至关重要.
结论:
- 植物基因酶 (ZmChi19A,OsChi19A) 可能有助于植物防御携带基因的病原体.
- 细菌胆酶 (CspCh18A) 和植物胆酶可能有助于根球中的营养循环.
- 结构域在基板裂变和真菌生长抑制中起着不同的作用,突出显示了复杂的功能适应.
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