在格拉姆阳性细菌中合成mnm5s2U的替代途径
Marshall Jaroch1, Guangxin Sun2,3, Ho-Ching Tiffany Tsui4
1Department of Microbiology and Cell Science, University of Florida, Gainesville, Florida, USA.
Journal of bacteriology
|March 29, 2024
概括
研究人员发现了一种新的酶,MnmL,对于合成mnm5s2UtRNA修饰在细菌中至关重要,如Bacillus subtilis和Streptococcus mutans. 这一发现揭示了必要的tRNA修改的替代途径,突出显示了细菌生物合成多样性.
科学领域:
- * 分子生物学 * 分子生物学
- * 生物化学 * 生物化学
- * 基因组学 是一个学科.
背景情况:
- *在摇摆基部的tRNA修改对于细菌的解码效率和准确性至关重要.
- *像mnm5s2U一样,xnm5s2U衍生物的合成是复杂的,并非所有生物体都能完全理解.
- *一些细菌中mnmC基因的缺失表明mnm5s2U合成的替代途径.
研究的目的:
- * 在缺乏mnmC的细菌中研究mnm5s2UtRNA修饰的替代生物合成途径.
- * 确定参与mnm5s2U合成的新型酶.
- * 探索tRNA修饰途径的进化多样性.
主要方法:
- *比较基因组学以确定潜在的基因正义学.
- * 用细菌模型进行遗传研究 (细菌细菌,菌株突变菌).
- *在不同的生长条件和遗传背景下对tRNA修饰的分析.
主要成果:
- * 一种激进的SAM超级家族蛋白,MnmL,被确定为B. subtilis和S. mutans中mnm5s2U合成的必需物.
- *MnmL与MnmM编码在一个操作子中,这是一种参与将nm5s2U转化为mnm5s2U的甲基酶.
- *tRNA修饰模式根据生长条件和遗传背景而异,这表明了调节机制.
- * MnmLM 途径在细菌群中保存,有些细菌,如巴西里,专门使用它.
结论:
- *一种新的MnmLM通路用于mnm5s2U合成,已在阳性细菌中被阐明.
- * 这代表了一个非正统的位移,展示了对保存的tRNA修饰的多样化的进化解决方案.
- * MnmLM路径突出显示了细菌tRNA修饰系统的适应性.
相关概念视频
Bacterial RNA Polymerase
29.5K
Unlike eukaryotes, bacteria use a single RNA Polymerase (RNAP) to transcribe all genes. The different subunits of bacterial RNAPhave distinct functions. The multisubunit structure of the bacterial RNAP helps the enzyme to maintain catalytic function, facilitate assembly, interact with DNA and RNA, and self-regulate its activity.
In most genes, the transcription site is a single base present upstream of the coding sequence. Though RNAP is a catalytically efficient enzyme, it does not recognize...
In most genes, the transcription site is a single base present upstream of the coding sequence. Though RNAP is a catalytically efficient enzyme, it does not recognize...
29.5K
Mismatch Repair
4.8K
Organisms are capable of detecting and fixing nucleotide mismatches that occur during DNA replication. This sophisticated process requires identifying the new strand and replacing the erroneous bases with correct nucleotides. Mismatch repair is coordinated by many proteins in both prokaryotes and eukaryotes.
The Mutator Protein Family Plays a Key Role in DNA Mismatch Repair
The human genome has more than 3 billion base pairs of DNA per cell. Prior to cell division, that vast amount of genetic...
The Mutator Protein Family Plays a Key Role in DNA Mismatch Repair
The human genome has more than 3 billion base pairs of DNA per cell. Prior to cell division, that vast amount of genetic...
4.8K
Nonsense-mediated mRNA Decay
10.6K
The Upf proteins that carry out nonsense-mediated decay (NMD) are found in all eukaryotic organisms, including humans. Each protein has an individual role, but they need to work in collaboration. Upf1 is an ATP-dependent RNA helicase that unwinds the RNA helix. Because Upf1 can unwind any RNA, Upf2 and Upf3 are required to help Upf1 discriminate between nonsense and normal mRNAs.
Usually, Upf3 binds to an Exon Junction Complex (EJC) at mRNA splice sites. If a ribosome fully translates the mRNA,...
Usually, Upf3 binds to an Exon Junction Complex (EJC) at mRNA splice sites. If a ribosome fully translates the mRNA,...
10.6K
Ribosomal RNA Synthesis
13.2K
Ribosome synthesis is a highly complex and coordinated process involving more than 200 assembly factors. The synthesis and processing of ribosomal components occurs not only in the nucleolus but also in the nucleoplasm and the cytoplasm of eukaryotic cells.
Ribosome biogenesis begins with the synthesis of 5S and 45S pre-rRNAs by distinct RNA polymerases. The primary transcripts are extensively processed and modified before they are bound and folded by ribosomal proteins and assembly factors,...
Ribosome biogenesis begins with the synthesis of 5S and 45S pre-rRNAs by distinct RNA polymerases. The primary transcripts are extensively processed and modified before they are bound and folded by ribosomal proteins and assembly factors,...
13.2K
Synthetic Biology
4.7K
Synthetic biology is an interdisciplinary science that involves using principles from disciplines such as engineering, molecular biology, cell biology, and systems biology. It involves remodeling existing organisms from nature or constructing completely new synthetic organisms for applications such as protein or enzyme production, bioremediation, value-added macromolecule production, and the addition of desirable traits to crops, to name a few.
Golden rice
Golden rice is a genetically modified...
Golden rice
Golden rice is a genetically modified...
4.7K


