对酒精脱酶在深层欧性溶剂中的活性变化的分子理解
Jan Philipp Bittner1, Ningning Zhang2, Pablo Domínguez de María3
1Institute of Thermal Separation Processes, Hamburg University of Technology, Eißendorfer Straße 38, Hamburg 21073, Germany.
The journal of physical chemistry. B
|January 17, 2025
概括
深度浸泡溶剂 (DES) 通过约束其活性部位来降低马肝酒精脱酶 (HLADH) 的活性,从而阻碍基质结合. 这项研究解释了观察到的活性变化,并为设计更好的酶兼容溶剂提供了见解.
科学领域:
- 生物催化剂是一种生物催化剂.
- 酶工程是什么?酶工程是什么?
- 计算化学是一种计算化学.
背景情况:
- 深度浸泡溶剂 (DES) 在生物催化剂中越来越多地使用,影响酶稳定性和溶解.
- 对于DESs对酶基质结合的影响在很大程度上仍未被探索.
- 了解这些相互作用对于优化酶过程至关重要.
研究的目的:
- 研究DESs对马肝酒精脱酶 (HLADH) 的基质结合的影响.
- 阐明DESs中酶活性改变背后的分子机制.
- 为设计酶兼容的DES提供一个框架.
主要方法:
- 在不同含水量的基于胆的DES (ChCl-EG,ChCl-Gly) 中对HLADH的分子动力学 (MD) 模拟.
- 雨采样 (美国) 与复制品交换相结合,以计算结合的自由能量.
- 分析活动部位的灵活性和腔腔大小.
主要成果:
- 与水溶液相比,DES溶液显著缩小了HLADH活性部位,并降低了其灵活性.
- 观察到的活性部位腔体大小的减少与酶活性降低相关.
- 基质 (环松) 结合的自由能量随着更高的DES度而增加,解释了减少的催化活性.
- 发现DES组件占据了基板结合道.
结论:
- DESs通过改变活性位点动态和阻碍基质结合来影响HLADH活性.
- 提出的计算方法有效地解释了DESs中的酶行为.
- 这项研究为增强生物催化剂的DES合理设计提供了基础.
相关概念视频
02:12Solvating Effects
7.3K
An understanding of the solvating effect helps rationalize the relation between solvation and acidity of the compound. In addition, this also explains the relative stability of conjugate bases for compounds with different pKa values. This lesson details, in-depth, the principle of solvating effects. The strength of an acid and the stability of its corresponding conjugate base are determined using pKa values. This observed relationship is a consequence of solvation, which is the interaction...
7.3K
02:35Acid-Catalyzed Dehydration of Alcohols to Alkenes
19.1K
In a dehydration reaction, a hydroxyl group in an alcohol is eliminated along with the hydrogen from an adjacent carbon. Here, the products are an alkene and a molecule of water. Dehydration of alcohols is generally achieved by heating in the presence of an acid catalyst. While the dehydration of primary alcohols requires high temperatures and acid concentrations, secondary and tertiary alcohols can lose a water molecule under relatively mild conditions.
19.1K
02:36Acidity and Basicity of Alcohols and Phenols
18.5K
Like water, alcohols are weak acids and bases. This is attributed to the polarization of the O–H bond making the hydrogen partially positive. Moreover, the electron pairs on the oxygen atom of alcohol make it both basic and nucleophilic. Protonation of an alcohol converts hydroxide, a poor leaving group, into water—a good one. The two acid–base equilibria corresponding to ethanol are depicted below.
18.5K
01:17Factors Affecting Activity Coefficient
726
The extended Debye-Hückel equation indicates that the activity coefficient of an ion in an aqueous solution at 25°C depends on three partially interdependent properties: the ionic strength of the solution, the charge of the ion, and the ion size.
The activity coefficient value for an ion is close to one when the solution has almost zero ionic strength, i.e., when the solution shows close to ideal behavior. As the ionic strength of the solution increases from 0 to 0.1 mol/L, a...
The activity coefficient value for an ion is close to one when the solution has almost zero ionic strength, i.e., when the solution shows close to ideal behavior. As the ionic strength of the solution increases from 0 to 0.1 mol/L, a...
726
01:10¹H NMR of Labile Protons: Temporal Resolution
1.1K
Protons bonded to heteroatoms such as nitrogen and oxygen exhibit a range of chemical shift values. This is due to the varying degree of hydrogen bonding between the proton and the heteroatom in other molecules. The extent of hydrogen bonding affects the electron density around the proton, thereby giving different chemical shift values for the protons in the proton NMR spectrum.
The –OH proton in alcohols typically appears in the range of δ 2 to 5 ppm but can vary depending on the specific...
The –OH proton in alcohols typically appears in the range of δ 2 to 5 ppm but can vary depending on the specific...
1.1K
01:24Thermodynamics: Activity Coefficient
1.3K
Activity is the measure of the effective concentration of the species in solution. It can be expressed as the product of the molar concentration of the species and its activity coefficient. The activity coefficient is a dimensionless quantity and depends on the total ionic strength of the solution.
The activity coefficient is a measure of the deviation from ideal behavior. When the ionic strength of the solution is minimal, the activity coefficient of an ionic species is close to unity, making...
The activity coefficient is a measure of the deviation from ideal behavior. When the ionic strength of the solution is minimal, the activity coefficient of an ionic species is close to unity, making...
1.3K