相关实验视频
Updated: Jul 25, 2026

09:28
In Vitro Transcription Assays and Their Application in Drug Discovery
Published on: September 20, 2016
概括
大肠杆菌中的nusA和nusB突变部分抑制了转录终止. 矛盾的是,这些突变增强了菌体部位的终结,这表明nusA和nusB蛋白与rho蛋白类似.
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 是一个遗传学.
背景情况:
- 转录终止是 prokaryotes 中的一个关键的调节过程.
- 众所周知,大肠杆菌的nusA和nusB基因参与了转录反终结.
- 菌体兰巴达N蛋白质介导抗终结.
研究的目的:
- 调查 nusA 和 nusB 突变在转录终结中的作用.
- 了解 nusA 和 nusB 影响转录终止的机制,特别是与菌体兰巴 N 蛋白有关的机制.
主要方法:
- 在大肠杆菌中 nusA1 和 nusB5 突变的遗传分析.
- 在菌体终结位点对转录终结效率的评估.
- 突变表型与rho突变的比较.
主要成果:
- nusA1和nusB5突变部分抑制了极性,表明对转录终止的影响.
- 这些突变矛盾地增强了菌体终结部位的转录终结.
- 罗基突变HDF026表现出与nusA和nusB突变相似的特性.
结论:
- nusA和nusB基因产物可以作为转录终止因子.
- 这些因素的功能似乎与rho蛋白相似.
- 这些发现为对大肠杆菌转录终止的复杂调节提供了新的见解.
相关概念视频
Mismatch Repair
Overview
Nucleotide Excision Repair
Overview
Nonsense-mediated mRNA Decay
The Upf proteins that carry out nonsense-mediated decay (NMD) are found in all eukaryotic organisms, including humans. Each protein has an individual role, but they need to work in collaboration. Upf1 is an ATP-dependent RNA helicase that unwinds the RNA helix. Because Upf1 can unwind any RNA, Upf2 and Upf3 are required to help Upf1 discriminate between nonsense and normal mRNAs.
Usually, Upf3 binds to an Exon Junction Complex (EJC) at mRNA splice sites. If a ribosome fully translates the mRNA,...
Usually, Upf3 binds to an Exon Junction Complex (EJC) at mRNA splice sites. If a ribosome fully translates the mRNA,...
Transcription Attenuation in Prokaryotes
Transcriptional attenuation occurs when RNA transcription is prematurely terminated due to the formation of a terminator mRNA hairpin structure. Bacteria use these hairpins to regulate the transcription process and control the synthesis of several amino acids including histidine, lysine, threonine, and phenylalanine. Transcription attenuation takes place in the non-coding regions of mRNA.
There are several different mechanisms used to attenuate transcription. In ribosome mediated...
There are several different mechanisms used to attenuate transcription. In ribosome mediated...
Nucleotide Excision Repair
DNA Distortion and Damage
Cells are regularly exposed to mutagens—factors in the environment that can damage DNA and generate mutations. UV radiation is one of the most common mutagens and is estimated to introduce a significant number of changes in DNA. These include bends or kinks in the structure, which can block DNA replication or transcription. If these errors are not fixed, the damage can cause mutations, which in turn can result in cancer or disease depending on which sequences are...
Cells are regularly exposed to mutagens—factors in the environment that can damage DNA and generate mutations. UV radiation is one of the most common mutagens and is estimated to introduce a significant number of changes in DNA. These include bends or kinks in the structure, which can block DNA replication or transcription. If these errors are not fixed, the damage can cause mutations, which in turn can result in cancer or disease depending on which sequences are...
Mismatch Repair
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...

