来自胡卜 (Daucus carota) 的CYP74B34酶具有双氧化酶/环氧醇合成酶活性:识别和生物化学特性
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Yana Y Toporkova1, Svetlana S Gorina2, Tatiana M Iljina2
1Kazan Institute of Biochemistry and Biophysics, Kazan Scientific Center of the Russian Academy of Sciences, Kazan, 420111, Russia. kibmail@kibb.knc.ru.
胡卜CYP74B34酶表现出双氧化酶 (HPL) 和环氧醇合成酶 (EAS) 的活性,将脂肪酸氧化转化为调节性氧利平. 这一发现增强了对植物应激反应和氧利平生物合成的理解.
科学领域:
- 植物生物化学和分子生物学
- 脂质新陈代谢和信号传递
- 酶学 是一种酶学.
背景情况:
- 氧化酶级联产生氧利平,对于植物调节过程和应激反应至关重要.
- CYP74B亚家族酶,特别是13种特异性氧化酶 (HPL),是这一级联中的关键参与者.
- 了解植物氧利平生物合成对于理解植物防御机制至关重要.
研究的目的:
- 为了识别和描述CYP74B34基因及其编码的酶从胡卜 (Daucus carota L.).
- 阐明重组CYP74B34酶的生物化学特性和基质特异性.
- 调查CYP74B34的双重HPL/EAS活性及其对氧利平形成的影响.
主要方法:
- 从胡卜中鉴定和克隆CYP74B34的基因.
- 再组合CYP74B34酶的表达和净化.
- 使用各种脂肪酸氧化物 (9-HPOD,13-HPOD,9-HPOT,13-HPOT) 的酶分析.
- 在胡卜根中分析氧利平的概况.
- 在CYP74B34和CYP74B33中的必需氨基酸残留物的位点导向突变发生.
主要成果:
- CYP74B34对烯酸和α-烯酸的9-和13-氧化物表现出活性.
- 该酶特别将9-HPOT和13-HPOT转化为阿尔多酸 (HPL产品).
- CYP74B34表现出双重HPL/环氧醇合成酶 (EAS) 活性,从13-HPOD和9-HPOD产生阿尔多酸和环氧醇.
- 这种双重活性在体内通过分析胡卜根中的氧利平蛋白样本来确认.
- 突变性研究为CYP74B34和CYP74B33.3的催化机制提供了洞察力.
结论:
- CYP74B34是胡卜中首次发现的酶,具有氧化酶 (HPL) 和环氧醇合成酶 (EAS) 活动.
- 这种双重功能有助于植物中多样化的氧利平蛋白配置文件,影响监管过程.
- 这些发现扩大了对植物氧利平生物合成途径和CYP74酶在应激反应中的作用的了解.
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