为氧铁PrnB提供一个氧捐赠体是必需的,以合成罗利特林
R Brian McMillan1, Hannah E Gering1, Anastasia E Ledinina1
1Department of Molecular and Structural Biochemistry, North Carolina State University, Raleigh, North Carolina 27695, United States.
Biochemistry
|August 19, 2025
概括
研究人员阐明了PrnB酶如何将7-chloro-l-tryptophan转化为单氨基甲酸,这是抗真菌生物合成的关键步骤. 这项研究揭示了在依赖血红素的芳香氧酶中一种新的氧气激活策略.
科学领域:
- 生物化学 生物化学
- 酶学 是一种酶学.
- 抗真菌生物合成 抗真菌生物合成
背景情况:
- PrnB是一种依赖于血红素的芳香氧酶 (HDAO) 酶.
- 它催化了一种独特的环形重组,用于皮罗利尼特林生物合成.
- PrnB功能的分子基础以前是未知的.
研究的目的:
- 阐明PrnB催化活性的分子机制.
- 了解HDAO超级家族内部的功能扩张.
- 调查PrnB使用的不寻常的氧气激活策略.
主要方法:
- 用过时的动力学方法来研究酶基质相互作用.
- 分析了酶介质复合物的形成和反应性.
- 使用替代氧化还原递送系统来实现酶循环.
主要成果:
- 7-chloro-l-tryptophan和氧气的连续结合形成了一个稳定的氧铁复合体.
- 这种中间体与基质没有反应,与其他HDAO不同.
- 酶周转需要氧复合体的激活,由氧化还原系统促进.
结论:
- 这项研究揭示了PrnB独特的催化功能的分子基础.
- PrnB代表了HDAO结构框架的功能扩展.
- 氧激活策略的改变解释了PrnB独特的酶活性.
相关概念视频
Redox Titration: Other Oxidizing and Reducing Agents
390
Besides iodine, other oxidizing or reducing agents can serve as titrants in redox titrations. Common oxidizing titrants include KMnO4, cerium(IV), and K2Cr2O7. The choice of oxidizing titrants depends on factors like stability, cost, analyte strength, and reaction rate between the analyte and titrant. KMnO4 is a strong oxidizing titrant that reduces from Mn(VII) to Mn(II) in a highly acidic solution, simultaneously oxidizing the analyte to a higher oxidation state. In this case, KMnO4 acts as a...
390
Oxidation of Phenols to Quinones
3.4K
In the presence of oxidizing agents, phenols are oxidized to quinones. Quinones can be easily reduced back to phenols using mild reducing agents. The electron-donating hydroxyl group enhances the reactivity of the aromatic ring, enabling oxidation of the ring even in the absence of an α hydrogen.
o-hydroxy phenols are oxidized to o-quinones and p-hydroxy phenols to p-quinones. Such redox reactions involve the transfer of two electrons and two protons. The reversible redox...
o-hydroxy phenols are oxidized to o-quinones and p-hydroxy phenols to p-quinones. Such redox reactions involve the transfer of two electrons and two protons. The reversible redox...
3.4K
Redox Equilibria: Overview
904
A reduction-oxidation reaction is commonly called a redox reaction. In a redox reaction, electrons are transferred from one species to another rather than being shared between or among atoms. The reducing agent or reductant is the species that loses electrons and gets oxidized in the process. The species that gains electrons and gets reduced in the process is the oxidizing agent or oxidant. Redox reactions are represented as two separate equations called half-reactions, where one equation...
904
Ladder Diagrams: Redox Equilibria
529
Ladder diagrams are useful tools for understanding redox equilibrium reactions, especially the effects of concentration changes on the electrochemical potential of the reaction. The vertical axis in the redox ladder diagrams represents the electrochemical potential, E. The area of predominance is demarcated using the Nernst equation.
Consider the Fe3+/Fe2+ half-reaction, which has a standard-state potential of +0.771 V. At potentials more positive than +0.771 V, Fe3+ predominates, whereas Fe2+...
Consider the Fe3+/Fe2+ half-reaction, which has a standard-state potential of +0.771 V. At potentials more positive than +0.771 V, Fe3+ predominates, whereas Fe2+...
529
Oxidation-Reduction Reactions
65.8K
Oxidation–Reduction Reactions
65.8K
Preparation of Amines: Reduction of Oximes and Nitro Compounds
4.0K
Oximes can be reduced to primary amines using catalytic hydrogenation, hydride reduction, or sodium metal reduction. The reduction of aliphatic and aromatic nitro compounds to primary amines takes place by either catalytic hydrogenation or by using active metals like Fe, Zn, and Sn in the presence of an acid.
Though catalytic hydrogenation can reduce nitrobenzenes, the reduction is nonselective in the presence of other functional groups. For instance, if nitrobenzene contains an aldehyde group,...
Though catalytic hydrogenation can reduce nitrobenzenes, the reduction is nonselective in the presence of other functional groups. For instance, if nitrobenzene contains an aldehyde group,...
4.0K


![[DPEPhosbcpCu]PF6: A General and Broadly Applicable Copper-Based Photoredox Catalyst](/_next/image?url=https%3A%2F%2Fcloudfront.jove.com%2FCDNSource%2Fteasers%2F59739.jpg&w=3840&q=50)