对古代dUTPase的结构和功能洞察力揭示了一个子域介导的基质识别和进化适应机制
Sheng-Chia Chen1, Chun-Chi Chou2, Wen-Ming Chen1
1Department of Seafood Science, National Kaohsiung University of Science and Technology, Kaohsiung 81157, Taiwan.
International journal of biological macromolecules
|November 27, 2025
概括
考古时代的dUTPases对于核酸代谢至关重要,但人们对其了解甚少. 这项研究揭示了Methanosarcina mazei dUTPase的一个独特的结构机制,扩大了对酶多样性的知识.
科学领域:
- 生物化学 生物化学
- 结构生物学 结构生物学
- 微生物学 微生物学
背景情况:
- 古代的dUTPases (脱氧氨酸三酸核二酸酶) 对核酸代谢至关重要.
- 它们的精确结构-功能关系,特别是在古生物中,仍然在很大程度上没有特征.
- 了解这些酶是核酸平衡和DNA完整性的关键.
研究的目的:
- 来自Methanosarcina mazei. 的三重体考古dUTPase的结构和机制的阐明.
- 研究独特的结构特征在基质结合和催化中的作用.
- 将这种古老酶与已知的dUTPases进行比较,以了解进化多样性.
主要方法:
- 在高分辨率 (1.45 Å和1.53 Å) 的X射线晶体学以确定apo和dUTP结合结构.
- 位点定向突变发生 (N55A,R58A) 来探测催化残留物.
- 分子动力学模拟用于分析蛋白质动力学和连接体相互作用.
- 遗传学分析以确定进化关系.
主要成果:
- 确定了Methanosarcina mazei dUTPase的高分辨率晶体结构.
- 确定了一个独特的结构插入 (子域I),对协调dUTP玛酸盐和稳定三元体至关重要,取代了在其他dUTPases中发现的保留动图V.
- 突变发生证实了亚域I的催化重要性.
- 模拟显示了C端区域的带诱导稳定.
结论:
- 甲沙辛菌迷宫dUTPase用于基质结合和催化的一种独特的结构策略,不同于正规的dUTPases,采用子域I而不是动机V.
- 这种古老的酶属于II型dUTPase类,但具有独特的基质识别机制.
- 这些发现扩大了对dUTPase结构多样性的理解,并为设计新型核酸加工酶提供了洞察力.
更多相关视频
12:07Chemical Modification of the Tryptophan Residue in a Recombinant Ca2+-ATPase N-domain for Studying Tryptophan-ANS FRET
Published on: October 9, 2021
3.7K
09:57Examining Proteasome Assembly with Recombinant Archaeal Proteasomes and Nondenaturing PAGE: The Case for a Combined Approach
Published on: December 17, 2016
7.0K
相关概念视频
Diversity of Archaea III
302
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...
302
Diversity of Archaea II
429
Archaea, one of the three domains of life, exhibit remarkable diversity and adaptability, thriving in both extreme and moderate environments. Historically, most identified archaea have been classified into two major phyla: Euryarchaeota and Crenarchaeota. However, recent molecular studies have expanded this classification to include three additional phyla: Thaumarchaeota, Nanoarchaeota, and Korarchaeota, each exhibiting unique characteristics and ecological roles.Thaumarchaeota: Mesophiles...
429
Diversity of Archaea IV
378
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...
378
Overview of Archaea
758
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...
758
Surface Appendages of Archaea
554
Archaeal surface appendages are highly specialized structures essential for environmental adaptation, encompassing roles in adhesion, biofilm formation, and motility. Among these appendages, pili and archaella stand out for their distinct morphologies and functionalities, enabling archaea to thrive in diverse and often extreme environments.Pili: Adhesion and Biofilm FormationPili are filamentous structures assembled from pilin protein subunits, primarily contributing to adhesion and biofilm...
554
Allosteric Proteins-ATCase
6.4K
Binding sites linkages can regulate a protein's function. For example, enzyme activity is often regulated through a feedback mechanism where the end product of the biochemical process serves as an inhibitor.
Aspartate transcarbamoylase (ATCase) is a cytosolic enzyme that catalyzes the condensation of L-aspartate and carbamoyl phosphate to N-carbamoyl-L-aspartate. This reaction is the first step in pyrimidine biosynthesis. UTP and CTP, the end products of the pyrimidine synthesis...
Aspartate transcarbamoylase (ATCase) is a cytosolic enzyme that catalyzes the condensation of L-aspartate and carbamoyl phosphate to N-carbamoyl-L-aspartate. This reaction is the first step in pyrimidine biosynthesis. UTP and CTP, the end products of the pyrimidine synthesis...
6.4K
