一个淫荡的设计师酶的进化专业化
Reuben B Leveson-Gower1, Laura Tiessler-Sala2, Henriette J Rozeboom3
1Stratingh Institute for Chemistry, University of Groningen, 9747AG Groningen, The Netherlands.
ACS catalysis
|February 13, 2025
概括
针对特定任务的酶进化可以降低整体催化能力. 设计酶与准氨基氨酸 (pAF) 的定向进化产生了专门的变体,揭示了这种权衡的分子机制.
科学领域:
- 生物化学和分子生物学
- 酶工程和定向进化研究
- 结构生物学和计算化学
背景情况:
- 酶乱交允许多种催化活动,但可以导致进化过程中的专业化.
- 酶的定向进化,虽然增强了特定的功能,但可能会减少它们更广泛的催化作用.
- 一个先前工程设计的设计酶,利用类氨基氨酸 (pAF) 作为催化残留物,经过了定向进化.
研究的目的:
- 阐明进化酶变体中催化特化背后的分子机制.
- 了解定向进化如何影响酶选择性和催化多样性.
- 研究pAF依赖的设计酶突变的结构和功能后果.
主要方法:
- 在一个散乱的设计酶上进行了两个独立的定向进化运动.
- 采用位点定向突变发生来引入特定的遗传变异.
- 利用X射线晶体学进行结构确定和计算分析以获得机械洞察力.
主要成果:
- 一个进化的变体表现出改变的四级结构,通过偏向的基质动力学增强了酶选择性催化作用.
- 第二种变体显示了内源性氨基酸侧链和pAF残留物之间的协同合作,形成了一个新的催化系统.
- 这两种变体都表现出催化专业化,证实了选择性和催化宽度之间的权衡.
结论:
- 进化酶的催化专业化可能来自重大结构重组或新型催化机械.
- 了解这些分子基提供了对酶进化的见解,并指导了未来的酶工程策略.
- 该研究强调了蛋白质结构,非正规氨基酸和催化功能之间的复杂相互作用.
相关概念视频
01:07Catalytically Perfect Enzymes
3.9K
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.
Most enzymes...
Most enzymes...
3.9K
01:13Induced-fit Model
80.1K
Most chemical reactions in cells require enzymes—biological catalysts that speed up the reaction without being consumed or permanently changed. They reduce the activation energy needed to convert the reactants into products. Enzymes are proteins, that usually work by binding to a substrate—a reactant molecule that they act upon.
Enzymes exhibit substrate specificity, meaning that they can only bind to certain substrates. This is mainly determined by the shape and chemical...
Enzymes exhibit substrate specificity, meaning that they can only bind to certain substrates. This is mainly determined by the shape and chemical...
80.1K
02:34Enzymes
80.5K
Inside living organisms, enzymes act as catalysts for many biochemical reactions involved in cellular metabolism. The role of enzymes is to reduce the activation energies of biochemical reactions by forming complexes with its substrates. The lowering of activation energies favor an increase in the rates of biochemical reactions.
Enzyme deficiencies can often translate into life-threatening diseases. For example, a genetic abnormality resulting in the deficiency of the enzyme G6PD...
Enzyme deficiencies can often translate into life-threatening diseases. For example, a genetic abnormality resulting in the deficiency of the enzyme G6PD...
80.5K
02:53Conservative Site-specific Recombination and Phase Variation
5.9K
Because the DNA segments are cut and reorganized in a direction-specific manner, site-specific recombination has emerged as an efficient genetic engineering technique. Flippase and Cyclization recombinases or Flp and Cre, respectively, are two members of the tyrosine recombinase family derived from bacteriophages, that are used to mediate site-specific DNA insertions, deletions, and targeted expression of proteins in mammalian cell lines.
The recognition sites for Cre recombinase called LoxP...
The recognition sites for Cre recombinase called LoxP...
5.9K
01:13Introduction to Mechanisms of Enzyme Catalysis
7.9K
For many years, scientists thought that enzyme-substrate binding took place in a simple "lock-and-key" fashion. This model stated that the enzyme and substrate fit together perfectly in one instantaneous step. However, current research supports a more refined view scientists call induced fit. The induced-fit model expands upon the lock-and-key model by describing a more dynamic interaction between enzyme and substrate. As the enzyme and substrate come together, their interaction causes...
7.9K
01:57Protein Complexes with Interchangeable Parts
2.5K
Groups of proteins may form a complex where each protein in this complex has a different role in the overall execution of the complex’s function. Often some of the proteins in the complex can be replaced by a closely related variant to give a complex that contains many of the same components yet is functionally distinct.
The SCF ubiquitin ligase is a protein complex of five individual proteins. This complex attaches ubiquitin to other target proteins to mark them for degradation. In order...
The SCF ubiquitin ligase is a protein complex of five individual proteins. This complex attaches ubiquitin to other target proteins to mark them for degradation. In order...
2.5K