阿德雷诺多克辛在全质上改变人体细胞染色体P450 11B酶,以加速基质结合并减缓释放速度
Cara L Loomis1, Sang-Choul Im2,3, Emily E Scott1,4,5
1Department of Biological Chemistry, University of Michigan Ann Arbor MI 48109 USA scottee@umich.edu.
腺素与CYP11B酶结合,通过增加联体的激活率和降低脱离率来增强类固醇生成,这表明构造变化的全质调制. 在CYP11B1和CYP11B2之间微妙的序列差异影响着联体结合,为选择性抑制提供了标.
科学领域:
- 生物化学 生化学
- 酶学 是一种酶学.
- 类固醇的产生.
背景情况:
- 人类线粒体膜CYP11B酶 (CYP11B1和CYP11B2) 对分别皮质醇和阿尔多素的合成至关重要.
- 这两种酶都需要上腺素氧化还原合作伙伴进行催化.
- 之前的研究表明,上腺素在全质上增加了对CYP11B酶的基质和抑制剂亲和力.
研究的目的:
- 为了研究上腺素对CYP11B酶联体结合率的动力效应.
- 阐明腺素结合影响CYP11B酶动态的全性机制.
- 为了比较CYP11B1和CYP11B2之间的基质结合动力学,并确定影响选择性的因素.
主要方法:
- 停止流动动力学被用来测量与CYP11B酶结合的配体的开关速率常数.
- 动力学测试是使用和不使用阿德伦多克辛进行的.
- 分析了CYP11B1和CYP11B2的基质结合动力学,包括与交换基质的实验.
主要成果:
- 上腺素结合显著增加了对CYP11B1和CYP11B2活性位点的配体结合的上速率并降低了关闭速率.
- 这些动力学变化表明,上腺素结合全性调节CYP11B酶的结构动态.
- 尽管具有高序列相同性,但CYP11B1和CYP11B2表现出不同的基质结合动力学 (单相与双相),即使基质被交换.
结论:
- 通过调节形态动态,阿德伦多克辛的结合动态地增强了与CYP11B酶的联结体相互作用.
- 在CYP11B1和CYP11B2之间发生的小序列变异对于连接体结合动力学和选择性具有功能意义.
- 了解这些相互作用为开发治疗应用CYP11B酶的选择性抑制剂提供了洞察力.
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