甲基因组学衍生 γ 型碳酸无水酶的结构和功能特征,并将其工程化为高热稳定性雌激酶
Charoutioun S Bodourian1, Mohsin Imran2, Nikolaos D Georgakis1
1Laboratory of Enzyme Technology, Department of Biotechnology, School of Applied Biology and Biotechnology, Agricultural University of Athens, Athens, Greece.
Protein science : a publication of the Protein Society
|November 26, 2025
概括
研究人员将低活性碳酸酶 (CA) 转化为高度热稳定的酶. 这种结构引导的酶工程展示了一种新的策略,用于从非活性前体中创建活性酶.
科学领域:
- 酶学 是一种酶学.
- 结构生物学 结构生物学
- 生物技术是生物技术.
背景情况:
- 一个假定的玛型碳酸无水酶 (γ-CA) 序列从一个地热泉元基因组学图书馆中被确定.
- 鉴定的序列,γ-CaCA,显示低无酶活性和没有酶活性,但高热稳定性.
研究的目的:
- 描述 γ-CaCA 的结构和功能.
- 通过结构导向设计将γ-CaCA转化为具有增强热稳定的催化活性酶.
主要方法:
- 16S rRNA基因测序用于微生物社区概况.
- 基因克隆,大肠杆菌中的表达和酶活性测试.
- 差分扫描计 (DSF) 用于热稳定性分析.
- 用于确定酶结构的X射线晶体学.
- 对酶突变发生的基于结构的合理设计.
主要成果:
- 在1.11 Å分辨率下确定了γ-CaCA的晶体结构,揭示了在子单元接口上具有结合位点的三聚体结构.
- 一个突变的酶, γ-CaCAmut,是通过七个的插入和两个点突变,将其转化为一种催化活性雌激酶创建的.
- 与野生类型酶相比,γ-CaCAmut的热稳定性显著增加.
- 对γ-CaCAmut的结构分析提供了对突变对酶结构,功能和稳定性的影响的见解.
结论:
- 这项研究为 γ-CA.As.提供了有价值的结构和功能见解.
- 结构引导工程成功地将低活性的γ-CA转化为高度热稳定和催化活性的酶.
- 这项工作展示了通过合理设计转化和增强酶活性的有效策略.
相关概念视频
Diversity of Archaea III
304
Crenarchaeota, a prominent phylum of Archaea, is remarkable for its ability to thrive in extreme environments characterized by high temperatures and acidity. These microorganisms inhabit sulfuric hot springs, volcanic systems, and submarine hydrothermal vents, where temperatures often exceed 100°C. The unique adaptations of Crenarchaeota not only allow survival under such extreme conditions but also provide insights into the mechanisms of life in primordial Earth-like...
304
Diversity of Archaea IV
381
Hyperthermophilic archaea are a group of extremophiles thriving at temperatures above 80°C, often in hydrothermal vents and volcanic soils where conditions surpass the boiling point of water. At such temperatures, proteins, membranes, and DNA in most organisms degrade, but hyperthermophiles have evolved remarkable adaptations to maintain stability and function.Unique Cellular FeaturesHyperthermophilic membranes are composed of a monolayer of biphytanyl tetraether lipids, which resist...
381
Hyperthermophilic Bacteria
463
Domain Bacteria includes some unique hyperthermophilic species. They exhibit remarkable adaptations that enable survival in extreme environments.Thermotoga species are rod-shaped, gram-negative, non-sporulating hyperthermophiles that form a sheath-like envelope called a toga. They ferment sugars or starch, producing lactate, acetate, CO₂, and H₂, and can also grow via anaerobic respiration using H₂ and ferric iron. Found in hot springs and hydrothermal vents, over 20% of their...
463
Diversity of Archaea I
518
Archaea, a domain of single-celled microorganisms, are classified into five major phyla based on genetic and biochemical characteristics: Euryarchaeota, Crenarchaeota, Thaumarchaeota, Korarchaeota, and Nanoarchaeota. Among these, the phylum Euryarchaeota is notable for its remarkable diversity in morphology, metabolism, and ecological adaptations.Morphological and Metabolic DiversityMembers of Euryarchaeota exhibit a variety of cellular shapes, including rods and cocci. Their metabolic pathways...
518
Introduction to Mechanisms of Enzyme Catalysis
10.4K
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...
10.4K
Overview of Archaea
766
Archaea, named after the Archaean eon, represent a unique domain of life, distinct from bacteria and eukaryotes, with remarkable traits. Their cellular and molecular features, ecological adaptability, and industrial relevance highlight their importance in understanding life processes and leveraging biotechnology.Cellular and Molecular CharacteristicsA defining feature of archaea is their unique membrane composition. Archaeal membranes contain ether-linked isoprenoid lipids, which confer...
766


