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相关概念视频

Amines to Amides: Acylation of Amines01:19

Amines to Amides: Acylation of Amines

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Various carboxylic acid derivatives (such as acid chlorides, esters, and anhydrides) can be used for the acylation of amines to yield amides. The reaction requires two equivalents of amines. The first amine molecule functions as a nucleophile and attacks the carbonyl carbon to produce a tetrahedral intermediate. This is followed by the loss of the leaving group and restoration of the C=O bond.
Next, the second equivalent of amine serves as a Brønsted base and deprotonates the quaternary...
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Aldehydes and Ketones with Amines: Enamine Formation Mechanism01:14

Aldehydes and Ketones with Amines: Enamine Formation Mechanism

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Enamine formation involves the addition of carbonyl compounds to a secondary amine through a series of reactions. The mechanism begins with the generation of carbinolamine, a nucleophilic attack followed by several proton transfer reactions. The hydroxyl group of the carbinolamine is converted into water to make a better leaving group that can push the reaction forward by eliminating a water molecule. In enamine formation, the last step involves the abstraction of a proton from the α carbon to...
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Indirect-Acting Cholinergic Agonists: Mechanism of Action01:18

Indirect-Acting Cholinergic Agonists: Mechanism of Action

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Indirect-acting cholinergic agonists work by interacting with an enzyme called acetylcholinesterase (AChE) in the synaptic cleft. They can be reversible or irreversible inhibitors and have different effects on the enzyme.
Reversible inhibitors like edrophonium bind to a specific part of the enzyme called the anionic catalytic site. They form noncovalent bonds, which means they are not strongly attached to the enzyme. This creates a temporary and less stable enzyme–inhibitor complex,...
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Reduction of Alkenes: Asymmetric Catalytic Hydrogenation02:17

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

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Catalytic hydrogenation of alkenes is a transition-metal catalyzed reduction of the double bond using molecular hydrogen to give alkanes. The mode of hydrogen addition follows syn stereochemistry.
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...
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Structure of Amines01:19

Structure of Amines

2.5K
The hybridized nitrogen atom in amines possesses a lone pair of electrons and is bound to three substituents with a bond angle of around 108°, which is less than the tetrahedral angle of 109.5°. However, the C–N–H bond angle is slightly larger at 112°, with a carbon–nitrogen bond length of 147 pm. This carbon–nitrogen bond length of of amines is longer than the carbon–oxygen bond of alcohols (143 pm) but shorter than alkanes’...
2.5K
Amides to Amines: LiAlH4 Reduction01:20

Amides to Amines: LiAlH4 Reduction

4.7K
Amide reduction with strong reducing agents like lithium aluminum hydride proceeds through a nucleophilic acyl substitution to form amines. Primary, secondary, and tertiary amides yield primary, secondary, and tertiary amines, respectively.
Amide reduction requires two equivalents of the reducing agent, acting as a source of hydride ions. As shown in the figure, the reaction is initiated with a nucleophilic attack by the hydride ion at the carbonyl carbon to form a tetrahedral intermediate.
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Identification of Functional Protein Regions Through Chimeric Protein Construction
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基于域工程的高辅酶亲和度的仿真氨基脱酶.

Jialin Li1,2,3, Xiaoqing Mu4,5,6, Tao Wu1,2

  • 1Laboratory of Brewing Microbiology and Applied Enzymology, School of Biotechnology, Jiangnan University, Wuxi, 214122, China.

Bioresources and bioprocessing
|April 22, 2024
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概括

工程化学氨基脱酶 (cFLF-AmDH) 增强了NADH辅因子亲和力和催化效率,用于芳香的奇拉氨基合成. 这种域混合酶为工业应用提供了更好的稳定性和更广泛的基质范围.

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氨基脱水酶的氨基脱水酶催化效率 催化效率 催化效率同酶的亲和力 同酶的亲和力同酶结合域是同酶的结合域.

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科学领域:

  • 生物催化和酶工程 生物催化和酶工程
  • 蛋白质工程和设计
  • 合成化学 合成化学

背景情况:

  • 依赖NADH的氨氨酸胺脱酶 (F-AmDH) 合成芳香性氨酸,但具有较低的辅酶亲和力和催化效率.
  • 由于F-AmDH的工业应用有限,因此需要提高酶性能.

研究的目的:

  • 开发一种具有增强NADH亲和力和催化效率的化学氨基脱酶 (cFLF-AmDH).
  • 通过域混合来提高F-AmDH的热稳定性和基质频谱.

主要方法:

  • 通过结合F-AmDH的基质结合域和leucine amine dehydrogenase (L-AmDH) 的辅因子结合域,构建了一个嵌合酶 (cFLF-AmDH).
  • 进行了动态分析,以评估NADH亲和力和催化效率 (kcat/Km).
  • 评估了热稳定性和基质频谱.
  • 利用分子动力学模拟来了解结构稳定性和辅酶结合.

主要成果:

  • 与母体F-AmDH相比,cFLF-AmDH的NADH亲和力提高了两倍,催化效率提高了4.4倍.
  • 观察到增强的热稳定性,在55°C时半衰期延长60%,以及更广泛的基质谱.
  • 分子动力学模拟表明cFLF-AmDH的结构稳定性增加.
  • 减少性氨化反应率增加了150%,在0.05mM的NAD+度下,转化率增加了150%.

结论:

  • 域混合是一种有效的策略,用于创建具有增强辅因子亲和力,催化效率,特异性和热稳定性的酶.
  • 开发的cFLF-AmDH表现出显著的改进,使其成为工业应用的有希望的生物催化剂.
  • 这项研究强调了域工程作为一种可行的方法,用于产生具有量身定制的催化性能的酶多样性.