选择性充电tRNA异受体解释了编码子使用模式
Johan Elf1, Daniel Nilsson, Tanel Tenson
1Department of Cell and Molecular Biology, Uppsala University, Biomedical Center, Box 596, 751 24 Uppsala, Sweden.
概括
当一种氨基酸稀缺时,特定转移RNA (tRNA) 降至零电荷,而其他则保持高电荷. 这种差异性反应取决于tRNA度和蛋白质合成期间的编码子使用.
科学领域:
- 分子生物学分子生物学
- 生物物理学的生物物理.
- 系统生物学 系统生物学
背景情况:
- 转移RNA (tRNA) 是重要的分子,在蛋白质合成过程中将氨基酸运送到核糖体.
- 细胞拥有多种类型的tRNA (异受体),可以携带相同的氨基酸.
- 调节tRNA充电对于维持细胞平衡和高效的蛋白质生产至关重要.
研究的目的:
- 在氨基酸限制条件下,模拟带电异接收器tRNA水平的动态行为.
- 了解确定异构受体tRNA之间的差异反应的因素.
- 调查子使用和tRNA度在这个调节机制中的作用.
主要方法:
- 开发一个理论模型来模拟tRNA充电动态.
- 纳入诸如异构受体度和子频率等参数.
- 在核糖体介导的转录衰减,转译和基因表达调节的背景下对tRNA反应的分析.
主要成果:
- 该模型预测,当氨基酸变得限制生长时,某些异受体的充电tRNA水平将降至接近零,而对于其他类型的异受体则保持高.
- 不同的反应是通过异构受体度的变化及其相应的子发生率的变化来解释的.
- 该模型成功地整合了已知的生物过程,包括转录衰减和转译.
结论:
- 异受体tRNA的充电水平根据氨基酸的可用性进行动态调节.
- 子使用偏差和tRNA池大小是特定于异构受体反应的关键决定因素.
- 这种调节机制有助于微调蛋白质合成和细胞适应.
相关概念视频
Types of RNA
Overview
Three main types of RNA are involved in protein synthesis: messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). These RNAs perform diverse functions and can be broadly classified as protein-coding or non-coding RNA. Non-coding RNAs play important roles in the regulation of gene expression in response to developmental and environmental changes. Non-coding RNAs in prokaryotes can be manipulated to develop more effective antibacterial drugs for human or animal use.
RNA...
Three main types of RNA are involved in protein synthesis: messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). These RNAs perform diverse functions and can be broadly classified as protein-coding or non-coding RNA. Non-coding RNAs play important roles in the regulation of gene expression in response to developmental and environmental changes. Non-coding RNAs in prokaryotes can be manipulated to develop more effective antibacterial drugs for human or animal use.
RNA...
From DNA to Protein
The flow of genetic information in cells from DNA to mRNA to protein is described by the central dogma, which states that genes specify the sequence of mRNAs, which in turn specify the sequence of amino acids making up all proteins. The decoding of one molecule to another is performed by specific proteins and RNAs. Because the information stored in DNA is so central to cellular function, it makes intuitive sense that the cell would make mRNA copies of this information for protein synthesis...
tRNA Activation
Aminoacyl-tRNA synthetases are present in both eukaryotes and bacteria. Though eukaryotes have 20 different aminoacyl-tRNA synthetases to couple to 20 amino acids, many bacteria do not have genes for all of these aminoacyl-tRNA synthetases. Despite this, they still use all 20 amino acids to synthesize their proteins. For instance, some bacteria do not have the gene encoding the enzyme that couples glutamine with its partner tRNA. In these organisms, one enzyme adds glutamic acid to all of the...
Types of RNA
Three main types of RNA are involved in protein synthesis: messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). These RNAs perform diverse functions and can be broadly classified as protein-coding or non-coding RNA. Non-coding RNAs play important roles in regulating gene expression in response to developmental and environmental changes. Non-coding RNAs in prokaryotes can be manipulated to develop more effective antibacterial drugs for human or animal use.
RNA Performs Diverse...
RNA Performs Diverse...
tRNA Activation
Aminoacyl-tRNA synthetases are present in both eukaryotes and bacteria. Though eukaryotes have 20 different aminoacyl-tRNA synthetases to couple to 20 amino acids, many bacteria do not have genes for all of these aminoacyl-tRNA synthetases. Despite this, they still use all 20 amino acids to synthesize their proteins. For instance, some bacteria do not have the gene encoding the enzyme that couples glutamine with its partner tRNA. In these organisms, one enzyme adds glutamic acid to all of the...
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...


