来自北极细菌Marinobacter sp. 的四度DABA转氨酶EctB的生物化学表征和突变分析. CK1 一个 CK1 一个
Amalie C A Skogvold1, Ingar Leiros1, Richard A Engh1
1Department of Chemistry, Faculty of Science and Technology, The Norwegian Structural Biology Center, UiT the Arctic University of Norway, Tromsø, Norway.
The FEBS journal
|February 7, 2026
概括
这项研究描述了EctB,它是来自Marinobacter sp.的ectoine生物合成中的关键酶. CK1.一个人. 我们阐明了它的四重体结构,并确定了其稳定性和催化活性的关键残留物.
科学领域:
- 生物化学 生物化学
- 结构生物学 结构生物学
- 酶学 是一种酶学.
背景情况:
- 埃克托因是一种有价值的 osmoprotectant,在制药和化品中具有应用.
- 酶EctB催化了ectoine生物合成中的速度限制步骤,将阿斯巴酸-β-半化物 (ASA) 转化为l-2,4-二氨基黄油酸 (DABA).
研究的目的:
- 研究来自新型性细菌Marinobacter sp.的EctB的结构和功能性质. CK1.一个人.
- 了解酶的稳定性,寡合化和催化活性之间的关系.
主要方法:
- 结晶学被用来确定EctB复合体的结构.
- 用局部定向的突变发生法来创造17种突变.
- 对野生类型和突变酶的特征是酶活性,热稳定性和寡合化.
主要成果:
- EctB形成四度体,并确定了它的晶体结构.
- 野生型EctB表现出广泛的pH,盐和温度稳定性,在pH8和30-45°C之间具有最佳活动.
- 在二聚体-二聚体接口和活性部位残留的突变显著影响了酶的稳定性和/或活性,有些突变完全取消了活性.
结论:
- 这项研究为EctB.的四重体结构,稳定性和功能机制提供了新的见解.
- 确定了影响EctB的寡合化,热稳定性和催化效率的关键残留物.
- 了解EctB的特性可以帮助优化各种工业应用的ectoine生产.
相关概念视频
01:39Mutations
94.6K
Overview
94.6K
01:35Mutations
44.6K
Mutations are changes in the sequence of DNA. These changes can occur spontaneously or they can be induced by exposure to environmental factors. Mutations can be characterized in a number of different ways: whether and how they alter the amino acid sequence of the protein, whether they occur over a small or large area of DNA, and whether they occur in somatic cells or germline cells.
Chromosomal Alterations Are Large-Scale Mutations
While point mutations are changes in a single nucleotide in...
Chromosomal Alterations Are Large-Scale Mutations
While point mutations are changes in a single nucleotide in...
44.6K
00:36Viral Mutations
39.9K
A mutation is a change in the sequence of bases of DNA or RNA in a genome. Some mutations occur during replication of the genome due to errors made by the polymerase enzymes that replicate DNA or RNA. Unlike DNA polymerase, RNA polymerase is prone to errors because it is not capable of “proofreading” its work. Viruses with RNA-based genomes, like HIV, therefore accrue mutations faster than viruses with DNA-based genomes. Because mutation and recombination provide the raw material...
39.9K
01:09Mutation, Gene Flow, and Genetic Drift
64.5K
In a population that is not at Hardy-Weinberg equilibrium, the frequency of alleles changes over time. Therefore, any deviations from the five conditions of Hardy-Weinberg equilibrium can alter the genetic variation of a given population. Conditions that change the genetic variability of a population include mutations, natural selection, non-random mating, gene flow, and genetic drift (small population size).
64.5K
01:30Point and Frameshift Mutations
1.2K
Point mutations are genetic alterations involving the change of a single nucleotide base pair in DNA. Depending on how the alteration affects protein synthesis, they can lead to various consequences.Point mutations fall into the following types:Silent mutations occur when a nucleotide change does not alter the amino acid sequence due to the redundancy of the genetic code. For instance, changing ACC to ACA still encodes threonine, leaving the protein function unaffected. This occurs because...
1.2K
01:18Mutations in Microorganisms
747
Mutations are heritable changes in an organism’s genome involving alterations in the base sequence of DNA or RNA. These changes can influence cellular processes and phenotypic traits, potentially transforming the unaltered wild type into a mutant form. Such changes, termed forward mutations, are pivotal in shaping the genetic diversity of organisms.RNA viruses exhibit the highest mutation rates due to the absence of robust proofreading mechanisms during genome replication. In contrast,...
747