一个RNA聚合酶II转录因子与腺病毒主要晚期促销者的上游元素结合
相关实验视频
Updated: Jul 13, 2026

07:44
High-throughput Purification of Affinity-tagged Recombinant Proteins
Published on: August 26, 2012
Cell
|December 1, 1985
概括
一种新型的转录因子,MLTF,专门与腺病毒主要晚期促进体结合. 这种结合激活了基因转录,揭示了病毒基因调节中的关键机制.
科学领域:
- 分子生物学分子生物学
- 病毒学 病毒学
- 基因规则 基因规则
背景情况:
- 了解病毒基因表达的调节在病毒学中至关重要.
- 特定的蛋白质-DNA相互作用决定了转录的启动.
- 腺病毒主要晚期促进体 (MLaP) 是真核生物转录的一个研究良好的模型.
研究的目的:
- 从HeLa细胞提取物中识别与腺病毒主要晚期促进体结合的蛋白质.
- 描述在转录调节中的已识别的DNA结合蛋白的功能.
- 阐明特定的DNA结合因子影响MLaP活动的机制.
主要方法:
- 凝电泳DNA结合试验被用于检测蛋白质-DNA相互作用.
- DNAase I 足迹测定被用来绘制特定因子的精确结合部位.
- 进行了体外转录试验,以评估蛋白质结合的功能影响.
- 生物化学分化 (染色学) 用于净化和确认因子的活性.
主要成果:
- 一个主要的晚期促进体转录因子 (MLTF) 被确定为一种特定的DNA结合蛋白.
- MLTF与MLaP的TATA盒 (-50至-66) 上游的一个区域具有高度亲和力.
- 这个上游区域对于MLaP活动至关重要,MLTF结合保护了这个地点.
- 结合MLTF刺激了从含有上游区域的模板中的体外转录.
- MLTF的DNA结合,足迹和转录刺激活动.
结论:
- MLTF是一个关键的转录因子,直接与腺病毒主要晚期促销者的特定上游元素结合.
- MLTF与上游区域的结合对于激活从MLaP转录至关重要.
- 这些发现揭示了在病毒基因表达中通过特定的蛋白质-DNA相互作用介导的转录激活的直接机制.
相关概念视频
RNA Polymerase II Accessory Proteins
Proteins that regulate transcription can do so either via direct contact with RNA Polymerase or through indirect interactions facilitated by adaptors, mediators, histone-modifying proteins, and nucleosome remodelers. Direct interactions to activate transcription is seen in bacteria as well as in some eukaryotic genes. In these cases, upstream activation sequences are adjacent to the promoters, and the activator proteins interact directly with the transcriptional machinery. For example, in...
The Eukaryotic Promoter Region
The eukaryotic promoter region is a segment of DNA located upstream of a gene. It contains an RNA polymerase binding site, a transcription start site, and several cis-regulatory sequences. The proximal promoter region is located in the vicinity of the gene and has cis-regulatory sequences and the core promoter. The core promoter is the binding site for RNA polymerase and is usually located between -35 and +35 nucleotides from the transcription start site. The distal promoter regions are...
Transcription Initiation
Initiation is the first step of transcription in eukaryotes. Prokaryotic RNA Polymerase (RNAP) can bind to the template DNA and start transcribing. On the other hand, transcription in eukaryotes requires additional proteins, called transcription factors, to first bind to the promoter region in the DNA template. This binding helps recruit the specific RNAP that can assemble on the DNA and start transcription.
The promoters and enhancers and their accessory proteins allow tight regulation of...
The promoters and enhancers and their accessory proteins allow tight regulation of...
General Transcription Factors
Tissue-specific transcription factors contribute to diverse cellular functions in mammals. For example, the gene for beta globin, a major component of hemoglobin, is present in all cells of the body. However, it is only expressed in red blood cells because the transcription factors that can bind to the promoter sequences of the beta globin gene are only expressed in these cells. Tissue-specific transcription factors also ensure that mutations in these factors may impair only the function of...
RNA Polymerase II Accessory Proteins
Proteins that regulate transcription can do so either via direct contact with RNA Polymerase or through indirect interactions facilitated by adaptors, mediators, histone-modifying proteins, and nucleosome remodelers. Direct interactions to activate transcription is seen in bacteria as well as in some eukaryotic genes. In these cases, upstream activation sequences are adjacent to the promoters, and the activator proteins interact directly with the transcriptional machinery. For example, in...
The Eukaryotic Promoter Region
The eukaryotic promoter region is a segment of DNA located upstream of a gene. It contains an RNA polymerase binding site, a transcription start site, and several cis-regulatory sequences. The proximal promoter region is located in the vicinity of the gene and has cis-regulatory sequences and the core promoter. The core promoter is the binding site for RNA polymerase and is usually located between -35 and +35 nucleotides from the transcription start site. The distal promoter regions are...

