事实上,FACT是一种通过核细胞体促进转录延长的因素
G Orphanides1, G LeRoy, C H Chang
1Howard Hughes Medical Institute, Department of Biochemistry, University of Medicine and Dentistry of New Jersey, Robert Wood Johnson Medical School, Piscataway 08854, USA.
Cell
|March 7, 1998
概括
染色体重塑使转录启动成为可能,但需要FACT蛋白来克服核酶诱导的阻断,以产生转录延长. 事实促进RNA聚合酶II通过核体.
科学领域:
- 分子生物学分子生物学
- 基因表达 基因表达
- 染色体结构 染色体结构
背景情况:
- 由RNA聚合酶II转录是一种由染色质调节的基本过程.
- 染色体重塑对于转录启动至关重要,但可以阻碍延长.
研究的目的:
- 调查从染色质模板中生产性转录所需的因素.
- 识别和描述涉及克服转录阻碍的辅助因素.
主要方法:
- 在体外组装染色体模板.
- 用人类一般转录因子和RNA聚合酶II重构转录.
- 净化和新型辅助因子的生物化学表征.
主要成果:
- 激活剂诱导的染色体重塑促进了预启动复合体的形成和启动.
- RNA聚合酶II在重塑的染色质上启动后遇到了生产转录的阻断.
- 一种纯化的因子,FACT (促进染色体转录),被确定为克服这一阻断的必要因素.
- 事实促进RNA聚合酶II通过核体,使转录延长.
结论:
- 通过染色质进行有效的转录不仅仅需要启动.
- FACT是一种新型的蛋白质因子,对于克服核细胞因子诱导的转录延长阻塞至关重要.
- 事实在促进RNA聚合酶II通过核细胞DNA的过程性方面发挥着关键作用.
相关概念视频
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...
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...
Transcription Elongation Factors
Transcription elongation is a dynamic process that alters depending upon the sequence heterogeneity of the DNA being transcribed. Hence, it is not surprising that the elongation complex's composition also varies along the way while transcribing a gene.
The transcription elongation is regulated via pausing of RNA polymerase on several occasions during transcription. In bacteria, these halts are necessary because the transcription of DNA into mRNA is coupled to the translation of that mRNA into a...
The transcription elongation is regulated via pausing of RNA polymerase on several occasions during transcription. In bacteria, these halts are necessary because the transcription of DNA into mRNA is coupled to the translation of that mRNA into a...
Chromatin Structure Regulates pre-mRNA Processing
In eukaryotic cells, nascent mRNA transcripts need to undergo many post-transcriptional modifications to reach the cell cytoplasm and translate into functional proteins. For a long time, transcription and pre-mRNA processing were considered two independent events that occur sequentially in the cell. However, it has now been well established that transcription and pre-mRNA processing are two simultaneous processes that are precisely regulated inside the cell.
The chromatin structure, especially...
The chromatin structure, especially...
Eukaryotic Transcription Activators
Transcription activators are proteins that promote the transcription of genes from DNA to RNA. In most cases, these proteins contain two separate domains ‒ a domain that binds to DNA and a domain for activating transcription; however, in some cases, a single domain is responsible for both binding and activation of transcription, as seen in the glucocorticoid receptor and MyoD.
The binding domains are capable of recognizing and interacting with regulatory sequences on the DNA. These domains are...
The binding domains are capable of recognizing and interacting with regulatory sequences on the DNA. These domains are...
Transcription Elongation Factors
Transcription elongation is a dynamic process that alters depending upon the sequence heterogeneity of the DNA being transcribed. Hence, it is not surprising that the elongation complex's composition also varies along the way while transcribing a gene.
The transcription elongation is regulated via pausing of RNA polymerase on several occasions during transcription. In bacteria, these halts are necessary because the transcription of DNA into mRNA is coupled to the translation of that mRNA into a...
The transcription elongation is regulated via pausing of RNA polymerase on several occasions during transcription. In bacteria, these halts are necessary because the transcription of DNA into mRNA is coupled to the translation of that mRNA into a...


