4-OT的设计合成模拟物是针对非天然基质的特异性
Norman Metanis1, Ehud Keinan, Philip E Dawson
1Department of Chemistry and Institute of Catalysis Science and Technology, Technion-Israel Institute of Technology, Technion City, Haifa 32000, Israel.
Journal of the American Chemical Society
|April 21, 2005
概括
研究人员通过将氨酸用氨酸残留物替代氨酸来设计4-oxalocrotonate tautomerase (4-OT). 这种修改增强了非自然基质的特异性,证明了可预测的酶工程,用于新的结合相互作用.
科学领域:
- 酶工程和蛋白质化学.
- 生物催化和基质特异性.
- 蛋白质活性部位的修饰.
背景情况:
- 4-oxalocrotonate tautomerase (4-OT) 通常使用阿尔金因残留物与其二基质之间的静电相互作用.
- 修改活性部位残留物可以改变酶功能和基质识别.
- 了解这些相互作用是设计具有新型催化活动的酶的关键.
研究的目的:
- 设计4-OT用于特定识别单离子基质模拟物.
- 为了研究结与静电相互作用在催化中的作用.
- 探索将非编码氨基酸纳入新结合机制的潜力.
主要方法:
- 位点导向的突变发生,在4-OT活性位点中用素残留物取代阿尔金因.
- 工程酶变体的催化活性和基质特异性的表征.
- 野生类型和突变酶性能与天然和模拟基质的比较分析.
主要成果:
- 经过工程设计的 (Arg39Cit) 4-OT 模拟有效催化了单胺-单酸基质的分体化.
- 突变酶对天然二酸基质的活性显著降低.
- 与野生类型酶相比,单胺单酸基质对二酸基质的特异性增加了740倍.
结论:
- 活性部位功能组的化学操纵可预测地改变了酶的催化活性和基质特异性.
- 用结合组取代带电残留物可以将酶偏好转移到不同的基质类型.
- 结合非编码的氨基酸为开发新的酶机制和结合相互作用提供了一个有希望的策略.
相关概念视频
Carbon Skeletons
Life on Earth is carbon-based, as all macromolecules that make up living organisms contain carbon atoms. All organic compounds have a carbon backbone. Each carbon atom is tetravalent and can bond with four other atoms, making it an extraordinarily flexible component of biological molecules. Because carbon’s valence electrons are stable, it rarely becomes an ion. As the carbon chain increases in length, structural modifications such as ring structures, double bonds, and branching side chains...
Molecular Models
Physical models representing molecular architectures of chemical compounds play essential roles in understanding chemistry. The use of molecular models makes it easier to visualize the structures and shapes of atoms and molecules.
Synthetic Biology
Synthetic biology is an interdisciplinary science that involves using principles from disciplines such as engineering, molecular biology, cell biology, and systems biology. It involves remodeling existing organisms from nature or constructing completely new synthetic organisms for applications such as protein or enzyme production, bioremediation, value-added macromolecule production, and the addition of desirable traits to crops, to name a few.
Golden rice
Golden rice is a genetically modified...
Golden rice
Golden rice is a genetically modified...
Polymer Classification: Stereospecificity
Polymerization generates chiral centers along the entire backbone of a polymer chain. Accordingly, the stereochemistry of the substituent group has a significant effect on polymer properties. Polymers formed from monosubstituted alkene monomers feature chiral carbons at every alternate position in the polymer backbone. Relative to the predominant orientation of substituents at the adjacent chiral carbons, the polymer can exist in three different configurations: isotactic, syndiotactic, and...
Olefin Metathesis Polymerization: Overview
Recently, the development of olefin metathesis polymerization advanced the field of polymer synthesis. Simply put, the reorganization of substituents on their double bonds between two olefins in the presence of a catalyst is known as the olefin metathesis reaction. The use of metathesis reaction for polymer synthesis is called olefin metathesis polymerization.
Ruthenium-based Grubbs catalyst is the most commonly used catalyst for olefin metathesis polymerization. Grubbs catalyst consists of a...
Ruthenium-based Grubbs catalyst is the most commonly used catalyst for olefin metathesis polymerization. Grubbs catalyst consists of a...
Classification and Mechanical Properties of Synthetic Polymers
Synthetic polymers are classified as elastomers, fibers, or plastics based on their crystallinity. Crystallinity, the degree of long-range order in the solid state, influences the mechanical properties (stretching or contracting) of elastomers. Elastomers are flexible polymers that can expand or contract easily upon the application of an external force. They have numerous crosslinks that pull them back into their original shape when stress is removed. Silicones, for instance, are highly elastic...


