相关实验视频
Updated: Jul 17, 2026

09:33
An Anaerobic Biosensor Assay for the Detection of Mercury and Cadmium
Published on: December 17, 2018
来自Bacillus sp.的脱毒催化剂离子还原酶的结构 这种菌株是RC6077
N Schiering1, W Kabsch, M J Moore
1Max-Planck-Institut für Medizinische Forschung, Abteilung Biophysik, Heidelberg, Germany.
Nature
|July 11, 1991
概括
微生物酶称为离子还原酶 (MerA) 排毒有毒. 结构分析揭示了MerA如何适应结合和减少,为这个独特的生物过程提供了洞察力.
科学领域:
- 生物化学 生物化学
- 结构生物学 结构生物学
- 环境微生物学 环境微生物学
背景情况:
- 污染对环境构成重大威胁.
- 微生物拥有除毒途径,涉及离子还原酶 (MerA) 等酶.
- 梅尔A酶与FAD依赖的二硫酸氧化还原酶相同,并催化减少.
研究的目的:
- 为了确定来自Bacillus sp.的MerA的晶体结构. 菌株RC607.7.是一种
- 阐明MerA基质特异性和催化机制的结构基础.
- 了解MerA如何适应有毒金属基质,包括和.
主要方法:
- 使用X射线结晶学来确定MerA.的结构.
- 分析了MerA与尼古丁胺二核酸基质和离子的复合物.
- 进行了与其他MerA酶和人类谷氨缩酶的比较分析.
主要成果:
- 来自Bacillus sp.的MerA的晶体结构 已经确定了RC607菌株.
- 分析揭示了MerA如何经历有限的结构变化来结合和减少 (Hg (II)).
- 该研究确定了结构特征,使MerA能够接受有毒金属抑制剂,如 (Cd(II)) 作为基质.
结论:
- 了解MerA中的结模式对于理解其排毒功能至关重要.
- 梅拉的结构可塑性突出显示了它对处理有毒金属基质的独特适应性.
- 这项研究为进一步研究生物修复和酶工程提供了基础.
相关概念视频
Oxymercuration-Reduction of Alkenes
Oxymercuration–reduction of alkenes is one of the major reactions converting alkenes to alcohols. It involves the hydration of alkenes with mercuric acetate in a mixture of tetrahydrofuran and water, forming an organomercury adduct. This is followed by a demercuration step in which the adduct is reduced to an alcohol using sodium borohydride.
Electron Transport Chain: Complex I and II
The mitochondrial electron transport chain (ETC) is the main energy generation system in the eukaryotic cells. However, mitochondria also produce cytotoxic reactive oxygen species (ROS) due to the large electron flow during oxidative phosphorylation. While Complex I is one of the primary sources of superoxide radicals, ROS production by Complex II is uncommon and may only be observed in cancer cells with mutated complexes.
ROS generation is regulated and maintained at moderate levels necessary...
ROS generation is regulated and maintained at moderate levels necessary...
The Electron Transport Chain
The electron transport chain or oxidative phosphorylation is an exothermic process in which free energy released during electron transfer reactions is coupled to ATP synthesis. This process is a significant source of energy in aerobic cells, and therefore inhibitors of the electron transport chain can be detrimental to the cell's metabolic processes.
Inhibitors of the electron transport chain
Rotenone, a widely used pesticide, prevents electron transfer from Fe-S cluster to ubiquinone or Q in...
Inhibitors of the electron transport chain
Rotenone, a widely used pesticide, prevents electron transfer from Fe-S cluster to ubiquinone or Q in...
Benzene to 1,4-Cyclohexadiene: Birch Reduction Mechanism
Birch reduction uses solvated electrons as reducing agents. The reaction converts benzene to 1,4-cyclohexadiene. The reaction proceeds by the transfer of a single electron to the ring to form a benzene radical anion. This anion is highly basic—it abstracts a proton from the alcohol to form a cyclohexadienyl radical. Another single electron transfer gives the cyclohexadienyl anion. A proton transfer from the alcohol forms 1,4-cyclohexadiene. Since this reduction occurs via radical anion...
Electron Transport Chain: Complex III and IV
During the electron transport chain, electrons from NADH and FADH2 are first transferred to complexes I and II, respectively. These two complexes then transfer the electrons to ubiquinol, which carries them further to complex III. Complex III passes the electrons across the intermembrane space to Cyt c, which carries them further to complex IV. Complex IV donates electrons to oxygen and reduces it to water. As electrons pass through complexes I, III, and IV, the energy released aids the pumping...
Phase I Reactions: Reductive Reactions
Phase I biotransformation reductive reactions are chemical processes that modify drugs by introducing or revealing polar functional groups via reduction. Enzymes called reductases catalyze these reactions, playing a pivotal role in drug metabolism by transforming lipophilic drugs into more polar, water-soluble metabolites for easy excretion. An essential type of reductive reaction is the carbonyl group reduction, where aldehydes and ketones are reduced to alcohols. An example is the...
![[(DPEPhos)(bcp)Cu]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)
