龙:利用DNA修复的力量来加速Corynebacterium glutamicum中的基因组进化
Yun Ju1, Hongyu Zhang2, Xiaocong Du1
1Tianjin University of Science and Technology, Tianjin, 300457, PR China.
Metabolic engineering
|August 14, 2023
概括
科学家们设计了DNA修复,在Corynebacterium glutamicum中创建了一个超突变系统. 这种DNA修复辅助基因组进化 (DRAGON) 方法加速了微生物菌株的改善,用于工业应用.
科学领域:
- 微生物学 微生物学
- 分子生物学分子生物学
- 遗传学 遗传学 是一个
背景情况:
- 高突变,即高自发突变率,有助于细菌在压力下快速适应.
- 缺陷的DNA修复机制与高突变有关,这表明DNA修复是控制突变率的目标.
- 了解Corynebacterium glutamicum中的DNA修复对于基因工程和菌株改进至关重要.
研究的目的:
- 确定影响高突变的Corynebacterium glutamicum中关键的DNA修复因素.
- 开发一种用于控制性突变发生的新型基因组工程系统.
- 为了证明这个系统在加速微生物菌株改善方面的实用性.
主要方法:
- 在Corynebacterium glutamicum中对DNA修复系统的全面调查.
- 工程的四个DNA修复因子 (nucS,标签,xpb,dinP) 与过度突变相关.
- 基于CRISPRi的全合一等离子体系统的开发,用于基因组突变发生.
- 应用DNA修复辅助基因组进化 (DRAGON) 战略.
主要成果:
- 四个DNA修复因子 (nucS,tag,xpb,dinP) 被确定为高突变的关键目标.
- 建立了一个基于CRISPRi的系统,以实现高效的基因组突变发生.
- 在C. glutamicum中,DRAGON策略成功地提高了微生物的强度,包括对甲胺,酸性pH和L-的耐受性.
- 在微生物菌株中证明了快速获得所需特征.
结论:
- 针对DNA修复途径提供了一种强大的策略,用于诱导和控制高突变.
- DRAGON方法提供了一种新且有效的方法,用于快速进化工程和细菌菌株的改进.
- 这项研究增强了对DNA修复在细菌适应中的作用的理解,并为合成生物学应用提供了工具.
相关概念视频
01:20The Central Dogma
21.8K
The central dogma explains the flow of genetic information from DNA nucleotides to the amino acid sequence of proteins.
RNA is the Missing Link Between DNA and Proteins
In the early 1900s, scientists discovered that DNA stores all the information needed for cellular functions and that proteins perform most of these functions. However, the mechanisms of converting genetic information into functional proteins remained unknown for many years. Initially, it was believed that a single gene is...
RNA is the Missing Link Between DNA and Proteins
In the early 1900s, scientists discovered that DNA stores all the information needed for cellular functions and that proteins perform most of these functions. However, the mechanisms of converting genetic information into functional proteins remained unknown for many years. Initially, it was believed that a single gene is...
21.8K
02:31Homologous Recombination
50.7K
The basic reaction of homologous recombination (HR) involves two chromatids that contain DNA sequences sharing a significant stretch of identity. One of these sequences uses a strand from another as a template to synthesize DNA in an enzyme-catalyzed reaction. The final product is a novel amalgamation of the two substrates. To ensure an accurate recombination of sequences, HR is restricted to the S and G2 phases of the cell cycle. At these stages, the DNA has been replicated already and the...
50.7K
02:25Overview of DNA Repair
31.1K
In order to be passed through generations, genomic DNA must be undamaged and error-free. However, every day, DNA in a cell undergoes several thousand to a million damaging events by natural causes and external factors. Ionizing radiation such as UV rays, free radicals produced during cellular respiration, and hydrolytic damage from metabolic reactions can alter the structure of DNA. Damages caused include single-base alteration, base dimerization, chain breaks, and cross-linkage.
Chemically...
Chemically...
31.1K
01:20Mismatch Repair
4.9K
Organisms are capable of detecting and fixing nucleotide mismatches that occur during DNA replication. This sophisticated process requires identifying the new strand and replacing the erroneous bases with correct nucleotides. Mismatch repair is coordinated by many proteins in both prokaryotes and eukaryotes.
The Mutator Protein Family Plays a Key Role in DNA Mismatch Repair
The human genome has more than 3 billion base pairs of DNA per cell. Prior to cell division, that vast amount of genetic...
The Mutator Protein Family Plays a Key Role in DNA Mismatch Repair
The human genome has more than 3 billion base pairs of DNA per cell. Prior to cell division, that vast amount of genetic...
4.9K
02:27Base-pairing and DNA Repair
64.8K
64.8K