概括
研究人员确定了COUP转录因子的DNA结合部位,并净化了S300-II蛋白. S300-II对于卵蛋白促进剂活性至关重要,并且稳定了COUP-促进剂相互作用.
科学领域:
- 分子生物学分子生物学
- 生物化学 生物化学
- 遗传学 是一个遗传学.
背景情况:
- 两种转录因子,COUP (蛋蛋白上游促进体) 和S300-II,以前在HeLa细胞核提取物中被确定.
- 了解转录因子相互作用对于基因调节研究至关重要.
研究的目的:
- 为了确定COUP转录因子的特定DNA接触点.
- 为了净化和描述S300-II转录因子.
- 研究S300-II在基因转录中的功能作用及其与COUP的相互作用.
主要方法:
- 对DNA-蛋白相互作用的研究,以绘制 purin 基和酸盐骨干上的 COUP 结合位点.
- 使用染色学进行S300-II的广泛净化.
- 通过SDS-PAGE,凝切片化和重新化试验来识别活性S300-II聚.
- 在体外转录试验中使用卵胺,MMTV和酶促进剂进行了转录试验.
- 动力学研究分析S300-II和COUP之间的相互作用.
主要成果:
- COUP转录因子与DNA螺旋体主要槽中的特定基残留物相互作用.
- S300-II被净化了超过10万倍,并确定了它的活性多.
- S300-II对于卵蛋白促进物的体外转录至关重要.
- 此外,S300-II还可以刺激MMTV和酶促进体的转录.
- 动力学数据表明,S300-II通过降低解离速率来稳定COUP促进体复合物.
结论:
- 阐明了COUP精确的DNA结合机制.
- S300-II是卵蛋白基因转录的关键辅因子,并影响其他促进体.
- 通过稳定转录因子-促进体相互作用,S300-II可能会提高转录效率.
相关概念视频
02:16Transcription 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...
02:16Transcription 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...
02:13Cooperative Binding of Transcription Regulators
Transcriptional regulators bind to specific cis-regulatory sequences in the DNA to regulate gene transcription. These cis-regulatory sequences are very short, usually less than ten nucleotide pairs in length. The short length means that there is a high probability of the exact same sequence randomly occurring throughout the genome. Since regulators can also bind to groups of similar sequences, this further increases the chances of random binding. Transcriptional regulators form dimers that...
02:04Co-activators and Co-repressors
Gene transcription is regulated by the synergistic action of several proteins that form a complex at a gene regulatory site. This is observed in eukaryotes, where the regulation of gene expression is a complex process. Regulatory proteins in eukaryotes can broadly be classified into two types – regulators that bind directly to specific DNA sequences and co-regulators that associate with regulatory proteins but cannot directly bind to the DNA. These co-regulators are further divided into...
01:30General 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...
02:13Cooperative Binding of Transcription Regulators
Transcriptional regulators bind to specific cis-regulatory sequences in the DNA to regulate gene transcription. These cis-regulatory sequences are very short, usually less than ten nucleotide pairs in length. The short length means that there is a high probability of the exact same sequence randomly occurring throughout the genome. Since regulators can also bind to groups of similar sequences, this further increases the chances of random binding. Transcriptional regulators form dimers that...