由互补的RNA干环组成的复合体,并由蛋白质稳定:CoIE1 Rom蛋白质的功能
1Laboratory of Molecular Biology, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland 20892.
Cell
|January 26, 1990
概括
等离子RNA I通过与RNA II结合来抑制DNA复制. 罗姆蛋白稳定了这种RNA-RNA复合体,增强了DNA复制控制.
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:
- 等离子体DNA复制依赖于特定的RNA分子进行启动.
- RNA I 是一种小型等离子体规定的RNA,它调节了ColE1的DNA复制.
- 塑体规定的Rom蛋白调节RNA I和RNA II之间的相互作用.
研究的目的:
- 阐明RNA I与RNA II结合的机制,从而抑制ColE1的DNA复制.
- 研究Rom蛋白在稳定RNA I-RNA II复合体中的作用.
- 描述RNA-RNA相互作用和Rom结合的结构基础.
主要方法:
- 利用RNA I和RNA II的互补单干环片段来建模它们的相互作用.
- 通过RNAase V1敏感性测试评估复合物形成和稳定性.
- 研究了Rom蛋白对化学修饰的保护作用 (例如,乙基尼酸盐基化).
- 确定了Rom蛋白与RNA复合体的结合史泰基度和特异性.
主要成果:
- 互补的RNA干环通过它们的循环区域结合,形成RNAase V1敏感复合体.
- 罗姆蛋白质保护RNA-RNA复合体免受酶分裂和化学修饰.
- 罗姆作为二聚体结合,识别了复合物的整体结构,而不是特定的核酸序列.
- 罗姆通过降低解离率来增强复杂的形成,从而稳定相互作用.
结论:
- 通过循环循环相互作用,RNA I 与RNA II 的结合开始,形成对RNAase V1.1.敏感的结构.
- 罗姆蛋白稳定了这种抑制性RNA-RNA复合体,保护它免受降解和化学修饰.
- 罗姆的结构识别和稳定机制对于调节ColE1DNA复制启动至关重要.
相关概念视频
RNA Structure
Overview
The basic structure of RNA consists of a five-carbon sugar and one of four nitrogenous bases. Although most RNA is single-stranded, it can form complex secondary and tertiary structures. Such structures play essential roles in the regulation of transcription and translation.
Different Types of RNA Have the Same Basic Structure
There are three main types of ribonucleic acid (RNA): messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). All three RNA types consist of a...
The basic structure of RNA consists of a five-carbon sugar and one of four nitrogenous bases. Although most RNA is single-stranded, it can form complex secondary and tertiary structures. Such structures play essential roles in the regulation of transcription and translation.
Different Types of RNA Have the Same Basic Structure
There are three main types of ribonucleic acid (RNA): messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). All three RNA types consist of a...
RNA Structure
Overview
The basic structure of RNA consists of a five-carbon sugar and one of four nitrogenous bases. Although most RNA is single-stranded, it can form complex secondary and tertiary structures. Such structures play essential roles in the regulation of transcription and translation.
Different Types of RNA Have the Same Basic Structure
There are three main types of ribonucleic acid (RNA): messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). All three RNA types consist of a...
The basic structure of RNA consists of a five-carbon sugar and one of four nitrogenous bases. Although most RNA is single-stranded, it can form complex secondary and tertiary structures. Such structures play essential roles in the regulation of transcription and translation.
Different Types of RNA Have the Same Basic Structure
There are three main types of ribonucleic acid (RNA): messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). All three RNA types consist of a...
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...
RNA Structure
The basic structure of RNA consists of a string of ribonucleotides attached by phosphodiester bonds. Although most RNA is single-stranded, it can form complex secondary and tertiary structures. Such structures play essential roles in the regulation of transcription and translation.
Different Types of RNA Have the Same Basic Structure
There are three main types of ribonucleic acid (RNA) involved in protein synthesis: messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). All three...
Different Types of RNA Have the Same Basic Structure
There are three main types of ribonucleic acid (RNA) involved in protein synthesis: messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). All three...
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...
Nucleic Acid Structure
The pentose sugar in DNA is deoxyribose, while in RNA the pentose sugar is ribose. The difference between the sugars is the presence of the hydroxyl group on the ribose's second carbon and a hydrogen on the deoxyribose's second carbon. The phosphate residue attaches to the hydroxyl group of the 5′ carbon of one sugar and the hydroxyl group of the 3′ carbon of the sugar of the next nucleotide, which forms a 5′ to 3′ phosphodiester linkage.
DNA Structure
DNA has a double-helix structure. The...
DNA Structure
DNA has a double-helix structure. The...


