相关实验视频

Updated: Jul 15, 2025

Functional Complementation Analysis FCA: A Laboratory Exercise Designed and Implemented to Supplement the Teaching of Biochemical Pathways

Functional Complementation Analysis FCA: A Laboratory Exercise Designed and Implemented to Supplement the Teaching of Biochemical Pathways

Published on: June 24, 2016

探索芳香氨酸化酶的基质交换机模式

Yannik Brack¹, Chenghai Sun¹, Dong Yi^1,2

¹Department of Biotechnology and Enzyme Catalysis, Institute of Biochemistry, University of Greifswald, Felix-Hausdorff-Straße 4, 17489, Greifswald, Germany.

Chembiochem : a European journal of chemical biology

|September 25, 2023

概括

芳香氨基酶 (AALs) 是合成性氨基酸的关键生物催化剂. 研究人员设计了AALs,发现了新的动机,使得TAL酶中的氨酸转化为氨酸的转化率提高了20倍.

科学领域:

生物催化剂是一种生物催化剂.
酵素工程是什么? 酶工程是什么
蛋白质科学蛋白质科学

背景情况:

芳香氨基酶 (AALs) 是性l-α-氨基酸不对称合成的关键生物催化剂.
AALs具有类似的结构,但表现出严格的基质特异性 (tyrosine,phenylalanine,histidine).

研究的目的:

在AAL中发现新的氨基酸残留模式.
为了设计AALs来改变基质特异性.
为了提高AAL催化反应的效率.

主要方法:

生物信息分析用于识别AAL动机.
部位定向突变发生,将已知和新型的动机引入AALs.
酶活性测定用于评估基质特异性和转化效率.

主要成果:

在AAL中发现了8种新的和4种已知的氨基酸残留基因.
在PALs,PTALs和TALs中的工程基质开关图案在改变基质特异性方面只取得了部分成功.
在TAL中,三种新型残留物组合成功诱导了基质从氨酸转换为氨.
与野生类型的TAL相比,工程TAL变种的转换效率增加了20倍.

结论:

可以使用新的氨基酸残留组合来设计AAL中的基质特异性.
特定的工程 TAL 变体显示出显著增强的生物催化效率,用于从氨酸合成 fenylalanine.
这项研究为改善生物催化剂的AAL酶工程提供了洞察力.

关键词:

芳香氨酸酸酸酶是一种芳香氨酸酸酶.生物催化剂的生物催化剂生物信息学分析分析基质特异性基质特异性基板开关图案基板开关图案

更多相关视频

Direct Detection of the Acetate-forming Activity of the Enzyme Acetate Kinase

Direct Detection of the Acetate-forming Activity of the Enzyme Acetate Kinase

Published on: December 19, 2011

Specificity Analysis of Protein Lysine Methyltransferases Using SPOT Peptide Arrays

Specificity Analysis of Protein Lysine Methyltransferases Using SPOT Peptide Arrays

Published on: November 29, 2014

相关概念视频

Acid Halides to Amides: Aminolysis

Acid Halides to Amides: Aminolysis

Aminolysis is a nucleophilic acyl substitution reaction, where ammonia or amines act as nucleophiles to give the substitution product. Acid halides react with ammonia, primary amines, and secondary amines to yield primary, secondary, and tertiary amides, respectively.
In the first step of the aminolysis mechanism, the amine attacks the carbonyl carbon of the acyl chloride to form a tetrahedral intermediate. In the second step, the carbonyl group is re-formed with the elimination of a chloride...

Amines to Amides: Acylation of Amines

Amines to Amides: Acylation of Amines

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...

Nucleophilic Aromatic Substitution: Elimination–Addition

Nucleophilic Aromatic Substitution: Elimination–Addition

Simple aryl halides do not react with nucleophiles. However, nucleophilic aromatic substitutions can be forced under certain conditions, such as high temperatures or strong bases. The mechanism of substitution under such conditions involves the highly unstable and reactive benzyne intermediate. Benzyne contains equivalent carbon centers at both ends of the triple bond, each of which is equally susceptible to nucleophilic attack. This 50–50 distribution of products is...

Nucleophilic Aromatic Substitution of Aryldiazonium Salts: Aromatic SN1

Nucleophilic Aromatic Substitution of Aryldiazonium Salts: Aromatic S_N1

Treating arylamines with nitrous acid gives aryldiazonium salts that are effective substrates in nucleophilic aromatic substitution reactions. The diazonio group in these salts can be easily displaced by different nucleophiles, yielding a wide variety of substituted benzenes. The leaving group departs as nitrogen gas, and this easy elimination is the driving force for the substitution reaction.
In the Sandmeyer reaction, for example, the diazonio group is replaced by a chloro, bromo,...

Electrophilic Aromatic Substitution: Overview

Electrophilic Aromatic Substitution: Overview

In an electrophilic aromatic substitution reaction, an electrophile substitutes for a hydrogen of an aromatic compound.

Preparation of 1° Amines: Gabriel Synthesis

Preparation of 1° Amines: Gabriel Synthesis

Direct alkylation is not a suitable method for synthesizing amines because it produces polyalkylated products. Gabriel synthesis is the most preferred method to exclusively make primary amines. The method uses phthalimide, which contains a protected form of nitrogen that participates in alkylation only once to predominantly give primary amines.
Strong bases like NaOH or KOH deprotonate the phthalimide to form the corresponding anion, which acts as a nucleophile. Further, the anion attacks an...