在抗生素生物合成中的β-基酶的活性位点结构
Van V Vu1, Thomas M Makris, John D Lipscomb
1Department of Chemistry, University of Minnesota, Minneapolis, Minnesota 55455, USA.
Journal of the American Chemical Society
|April 22, 2011
概括
氨基醇生物合成酶CmlA含有独特的二铁,与相关酶不同. 这种结构差异可能会影响其反应机制和氧气激活.
科学领域:
- 生物化学 生物化学
- 酶学 是一种酶学.
- 结构生物学 结构生物学
背景情况:
- 甲生物合成途径依赖于特定的酶来实现其功能.
- 铁集群是各种金属酶 (包括基酶) 中的关键活性位点,包括基酶.
- 了解酶活性部位结构是阐明反应机制的关键.
研究的目的:
- 描述CmlA的活性位点结构,这是氨基醇生物合成中的关键β-基酶.
- 为了将CmlA中的二铁与其他相关酶中发现的二铁进行比较.
- 研究结构差异对酶功能和氧激活的潜在影响.
主要方法:
- 使用X射线吸收光谱 (XAS) 探测铁中心的电子和结构性质.
- 使用共振拉曼光谱学,了解二铁星团的振动模式和协调环境.
- 与同源酶进行了生物信息和结构比较.
主要成果:
- 在CmlA中包含一个 (微氧) - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 的 (微氧) - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 的 (微-1,3-碳氧化酸) 铁团,其铁中心有6个坐标.
- 该酶具有3-4个协调铁中心的胺联体.
- 这个活性位点位于一个独特的β-乳酸酶折叠中,与可溶性甲单氧酶和相关酶中的4螺旋捆动图不同.
结论:
- 与其他已知的二氧化酶相比,CmlA中的二氧化集群具有独特的结构和结合环境.
- 观察到的结构分歧,特别是独特的折叠和带集,表明CmlA.使用的活性氧物种的潜在差异.
- 需要进行进一步的研究,以充分了解CmlA独特的活性位结构对氨基醇生物合成途径的功能影响.
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