相关实验视频
Updated: Jul 13, 2026
10:58
Protein WISDOM: A Workbench for In silico De novo Design of BioMolecules
Published on: July 25, 2013
一种生物活性酶的计算设计
Mary A Dwyer1, Loren L Looger, Homme W Hellinga
1Department of Biochemistry, Duke University Medical Center, Durham, NC 27710, USA.
Science (New York, N.Y.)
|June 26, 2004
概括
计算性酶设计成功地将三酸异构酶活性引入了非酶蛋白,使用了18-22个突变. 工程酶显示显著的速率增强和生物活性,支持细菌生长.
科学领域:
- 蛋白质化学 蛋白质化学
- 酶工程是什么?酶工程是什么?
- 计算生物学是一种计算生物学.
背景情况:
- 酶活性对生物过程至关重要.
- 理性酶设计是一个具有挑战性但重要的领域.
- 了解蛋白质结构-功能关系是关键.
研究的目的:
- 通过计算设计和实验验证缺乏酶的蛋白质中的酶活性.
- 将三酸盐异合酶 (TIM) 活性引入 рибо结合蛋白 (RBP).
- 为了证明计算设计方法的普遍性.
主要方法:
- 利用计算方法来预测引入TIM活动到RBP中的突变.
- 具有18至22个特定突变的设计蛋白.
- 通过实验验证设计的酶的活性和生物功能.
主要成果:
- 与未催化反应相比,设计的蛋白质表现出10^5到10^6倍的速度增强.
- 工程酶表现出生物活性,在葡萄糖原生条件下支持大肠杆菌的生长.
- 成功地将一种新的酶功能引入非酶蛋白支架中.
结论:
- 计算设计方法对于创建新型酶活动是有效的.
- 这种方法具有广泛的潜力,可以设计各种各样的酶.
- 这项研究证实了合理蛋白质设计在合成生物学中的力量.
相关概念视频
01:19Enzyme Kinetics
Enzymes speed up reactions by lowering the activation energy of the reactants. The speed at which the enzyme turns reactants into products is called the rate of reaction. Several factors impact the rate of reaction, including the number of available reactants. Enzyme kinetics is the study of how an enzyme changes the rate of a reaction.
Scientists typically study enzyme kinetics with a fixed amount of enzyme in the controlled environment of a test tube. When more reactant, or substrate, is...
Scientists typically study enzyme kinetics with a fixed amount of enzyme in the controlled environment of a test tube. When more reactant, or substrate, is...
01:58Mechanical Protein Functions
Proteins perform many mechanical functions in a cell. These proteins can be classified into two general categories- proteins that generate mechanical forces and proteins that are subjected to mechanical forces. Proteins providing mechanical support to the structure of the cell, such as keratin, are subjected to mechanical force, whereas proteins involved in cell movement and transport of molecules across cell membranes, such as an ion pump, are examples of generating mechanical force.
01:07Catalytically Perfect Enzymes
The theory of catalytically perfect enzymes was first proposed by W.J. Albery and J. R. Knowles in 1976. These enzymes catalyze biochemical reactions at high-speed. Their catalytic efficiency values range from 108-109 M-1s-1. These enzymes are also called 'diffusion-controlled' as the only rate-limiting step in the catalysis is that of the substrate diffusion into the active site. Examples include triose phosphate isomerase, fumarase, and superoxide dismutase.
01:19Turnover Number and Catalytic Efficiency
The turnover number of an enzyme is the maximum number of substrate molecules it can transform per unit time. Turnover numbers for most enzymes range from 1 to 1000 molecules per second. Catalase has the known highest turnover number, capable of converting up to 2.8×106 molecules of hydrogen peroxide into water and oxygen per second. Lysozyme has the lowest known turnover number of half a molecule per second.
Chymotrypsin is a pancreatic enzyme that breaks down proteins during digestion. The...
Chymotrypsin is a pancreatic enzyme that breaks down proteins during digestion. The...