稳定的5'帽类比物用于光化学激活mRNA翻译
Florian P Weissenboeck1, Nils Klöcker1, Petr Špaček1
1Institute of Biochemistry, University of Münster, Münster 48149, Germany.
ACS omega
|March 25, 2024
概括
科学家们设计了一种新型的可光激活的5'盖模拟物Medronate-FlashCap,用于精确控制mRNA翻译和稳定性. 光激活使得可调节的蛋白质产生和抵抗分解酶的降解.
科学领域:
- 分子生物学分子生物学
- 在RNA生物学,RNA生物学.
- 生物化学 生化学
背景情况:
- 5'帽 (N7甲基化瓜诺辛,m7G) 对于真核RNA的稳定性,翻译启动和处理至关重要.
- 对5'帽的修改提供了一种控制mRNA命运的策略,包括翻译和降解.
- 之前的研究使用了可光分离的组来沉默mRNA翻译,从而使光控制的蛋白质产生.
研究的目的:
- 设计新型的5'帽类型,将可光分离组和三酸盐桥的修改结合起来.
- 为了研究这些组合修改对5'上限依赖的过程,如翻译和mRNA降解的影响.
- 开发一种可光激活的5'帽类型,用于对蛋白质合成进行精确的,可光感应的控制.
主要方法:
- 合成5'帽类型的类似物,在m7G的N2位置上有一个可光分解的组,在三酸盐桥 (Medronate-FlashCap) 中有一个medronate.
- 在体外转录以产生mRNA与合成的Medronate-FlashCap.
- 评估Medronate-FlashCap对细胞系统中的翻译启动,蛋白质产生和稳定性对抗脱落酶 (例如DcpS) 的影响,通过光激活.
主要成果:
- 合成的Medronate-FlashCap类似物成功地对外源mRNAs的翻译进行了变音.
- 光诱导的可光分离组的去除激活了蛋白质的产生,证明了转录后的控制.
- 麦德罗纳特修改使得5'盖能抵抗DcpS降解,同时保持盖结合蛋白相互作用.
结论:
- Medronate-FlashCap提供了一种多功能工具,用于精确,光感应控制mRNA转化和稳定性.
- 这种可光激活的盖子模拟物提供了对切割酶的增强抵抗力,延长了mRNA寿命.
- 这些发现为合成生物学和治疗学中先进的mRNA工程策略开辟了道路.
相关概念视频
mRNA Stability and Gene Expression
5.6K
The structure and stability of mRNA molecules regulates gene expression, as mRNAs are a key step in the pathway from gene to protein. In eukaryotes, the half-life of mRNA varies from a few minutes up to several days. mRNA stability is essential in growth and development. The absence of the proteins regulating its stability, such as tristetraprolin in mice, can cause systemic issues, including bone marrow overgrowth, inflammation, and autoimmunity.
Cis-acting Elements involved in mRNA stability
Cis-acting Elements involved in mRNA stability
5.6K
Initiation of Translation
32.7K
Initiating translation is complex because it involves multiple molecules. Initiator tRNA, ribosomal subunits, and eukaryotic initiation factors (eIFs) are all required to assemble on the initiation codon of mRNA. This process consists of several steps that are mediated by different eIFs.
First, the initiator tRNA must be selected from the pool of elongator tRNAs by eukaryotic initiation factor 2 (eIF2). The initiator tRNA (Met-tRNAi) has conserved sequence elements including modified bases at...
First, the initiator tRNA must be selected from the pool of elongator tRNAs by eukaryotic initiation factor 2 (eIF2). The initiator tRNA (Met-tRNAi) has conserved sequence elements including modified bases at...
32.7K
Pre-mRNA Processing: Modification of pre-mRNA Ends
9.3K
In eukaryotic cells, transcripts made by RNA polymerase are modified and processed before exiting the nucleus. Unprocessed RNA is called precursor mRNA or pre-mRNA to distinguish it from mature mRNA.
Once about 20-40 ribonucleotides have been joined together by RNA polymerase, a group of enzymes adds a cap to the 5' end of the growing transcript. In this process, a 5' phosphate is replaced by modified guanosine that has a methyl group attached (7-methyl guanosine). This 5' cap helps...
Once about 20-40 ribonucleotides have been joined together by RNA polymerase, a group of enzymes adds a cap to the 5' end of the growing transcript. In this process, a 5' phosphate is replaced by modified guanosine that has a methyl group attached (7-methyl guanosine). This 5' cap helps...
9.3K
RNA Stability
33.5K
Intact DNA strands can be found in fossils, while scientists sometimes struggle to keep RNA intact under laboratory conditions. The structural variations between RNA and DNA underlie the differences in their stability and longevity. Because DNA is double-stranded, it is inherently more stable. The single-stranded structure of RNA is less stable but also more flexible and can form weak internal bonds. Additionally, most RNAs in the cell are relatively short, while DNA can be up to 250 million...
33.5K
pre-mRNA Processing
52.9K
In eukaryotic cells, transcripts made by RNA polymerase are modified and processed before exiting the nucleus. Unprocessed RNA is called precursor mRNA or pre-mRNA to distinguish it from mature mRNA.
Once about 20-40 ribonucleotides have been joined together by RNA polymerase, a group of enzymes adds a “cap” to the 5’ end of the growing transcript. In this process, a 5’ phosphate is replaced by modified guanosine that has a methyl group attached to it (7-Methyl...
Once about 20-40 ribonucleotides have been joined together by RNA polymerase, a group of enzymes adds a “cap” to the 5’ end of the growing transcript. In this process, a 5’ phosphate is replaced by modified guanosine that has a methyl group attached to it (7-Methyl...
52.9K
tRNA Activation
19.2K
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...
19.2K


