细菌阿林酶的识别和表征:资源和基质的立体特异性
Yuanxiang Liu1, Yaru Li1, Yishu Peng1
1State Key Laboratory of Microbial Technology, Institute of Microbial Technology, Shandong University, Qingdao 266237, P. R. China.
Journal of agricultural and food chemistry
|May 29, 2024
概括
研究人员确定了包括Bacillus cereus cystathionine β-lyase (BcPatB) 在内的细菌聚合酶,以改善硫酸盐生物合成. 这些酶显示出高活性和农业和食品应用的潜力.
科学领域:
- 生物化学 生化学
- 酶学 是一种酶学.
- 微生物学 微生物学
背景情况:
- 酶酶的有限可用性阻碍了硫酸酸盐的生物合成,这是农业和食品工业的关键化合物.
- 硫酸盐,如氨酸,具有有价值的抗微生物和抗血性质.
- 探索新型细菌联酶资源对于扩大硫酸硫酸盐应用至关重要.
研究的目的:
- 发现和表征细菌氨酶酶,以实现高效的硫酸硫酸盐生物合成.
- 阐明已识别的细菌酶的催化特性和基质特异性.
- 研究细菌化酶在生产用于作物和食品保护的硫酸盐中的潜力.
主要方法:
- 对Allium sativum根球细菌进行选,以检测它们的合酶活性.
- 鉴定和表征具有高聚合酶活性的细菌氨酸β-酶 (MetCs).
- 细菌化酶与植物衍生的对应物的元基因组学分析和遗传学比较.
- 酶动力学,基质特异性研究和位点定向突变发生,以了解催化机制.
- 基质的化学合成和硫酸硫酸盐产品的生物活性评估.
主要成果:
- 分离了两种具有高活性 (>60 U mg-1) 的细菌MetCs,它们对L-(-) - 氨酸具有很高的活性.
- 细菌大谷菌的cystathionineβ-lyase (BcPatB) 对L-(±) - 氨酸和L-(+) - 氨酸 (208.6和225.1 U mg-1) 均表现出较高的活性.
- BcPatB与Allium alliinases具有更密切的遗传关系,这表明它们具有功能上的相似性.
- 突变性研究在BcPatB中发现了关键残留物 (Ile31,Ala32),这些残留物对基质立体特异性至关重要.
- 合成的硫酸盐表现出显著的抗微生物和抗血活动.
结论:
- 细菌细胞氨酸β-酶,特别是来自Bacillus cereus的BcPatB,是硫酸盐生产的有希望的生物催化剂.
- 了解BcPatB的结构-活性关系可以提高立体选择性合成硫酸盐的潜力.
- 已确定的细菌结合酶及其产品为作物保护和食品保存提供了可持续的方法.
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