一种特定于线虫的核糖核蛋白复合体调解主要线虫拼接领导者snRNP及其目标前mRNA之间的相互作用
Peter Eijlers1, Mohammed Al-Khafaji1, Eva Soto-Martin1
1School of Medicine, Medical Sciences and Nutrition, University of Aberdeen, Institute of Medical Sciences, Foresterhill, Aberdeen AB25 2ZD Scotland, UK.
Nucleic acids research
|April 27, 2024
概括
研究人员发现,线虫特异性蛋白质SNA-3和SUT-1与SmYRNAs形成复合体,对线虫生存能力和拼接领导者跨拼接至关重要. 这种SmY小核核核糖核蛋白 (snRNP) 复合体将SL1 snRNP招募到新生的转录物中,从而促进跨拼接体组装.
科学领域:
- 分子生物学分子生物学
- 遗传学 是一个遗传学.
- 在RNA生物学,RNA生物学.
背景情况:
- 拼接的领导者跨拼接对于许多真核生物的基因表达至关重要.
- 跨结合体组合的机制,特别是RNA组件如何相互作用,尚未完全理解.
研究的目的:
- 调查线虫特异性蛋白质SNA-3和SUT-1的功能.
- 阐明SmYRNAs在拼接领导者跨拼接和线虫基因表达中的作用.
主要方法:
- 免疫沉,然后进行质谱学.
- RNA免疫沉降测序 (RIP-Seq) 进行测序.
- 对SNA-3的耗尽研究.
主要成果:
- 确定了线虫特异性蛋白质SNA-3和SUT-1以及SmYRNAs之间的复合体.
- 证明SmY小核核核糖核蛋白 (snRNP) 对于线虫生存能力和拼接领导者跨拼接至关重要.
- 表明SNA-3和SUT-1与新生的RNA聚合酶II转录物结合并与SL1 snRNP相互作用.
- 发现SNA-3的枯竭破坏了SL1 snRNP组件和核心结合体蛋白之间的相互作用.
结论:
- 由SNA-3,SUT-1和SmYRNA组成的SmY snRNP是线虫生存必不可少的新型成分.
- SmY snRNP在招募SL1 snRNP到新生的前mRNAs的5'末端中发挥着关键作用.
- 这种招募是跨合体组装的一个关键步骤,促进了我们对线虫基因表达的理解.
相关概念视频
Nuclear Export of mRNA
7.7K
Before mRNAs are exported to the cytoplasm, it is crucial to check each mRNA for structural and functional integrity. Eukaryotic cells use several different mechanisms, collectively known as mRNA surveillance, to look for irregularities in mRNAs. Irregular or aberrant mRNA are rapidly degraded by various enzymes. If a defective mRNA escapes the surveillance, it would be translated into a protein which would either be non-functional or not function properly. One of the primary irregularities in...
7.7K
RNA Splicing
56.3K
Splicing is the process by which eukaryotic RNA is edited before its translation into protein. The RNA strand transcribed from eukaryotic DNA is called the primary transcript. The primary transcripts that become mRNAs are called precursor messenger RNAs (pre-mRNAs). Eukaryotic pre-mRNA contains alternating sequences of exons and introns. Exons are nucleotide sequences that code for proteins, whereas introns are the non-coding regions. In RNA splicing, introns are removed and exons are bonded...
56.3K
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
Directing Proteins to the Rough Endoplasmic Reticulum
7.2K
The organelle-specific signaling sequences direct proteins synthesized in the cytosol to their final destination like ER, mitochondria, peroxisomes, etc. Some of the proteins directed to ER are then trafficked via vesicles to other organelles within the cell or the extracellular environment through the Golgi complex. For example, the rough ER synthesizes soluble proteins for transportation to the lysosomes or secretion out of the cell. It can also synthesize transmembrane proteins that can...
7.2K
Regulation of Nuclear Protein Sorting
2.4K
Nuclear protein sorting regulates nucleus composition and gene expression, crucial for determining the fate of a eukaryotic cell. Hence, the entry and exit of molecules across the nuclear envelope is a tightly controlled process. Nuclear protein sorting can be inhibited by one of the following ways: 1) masking cargo signal sequences, 2) modifying the nuclear receptor's affinity for cargo, 3) controlling the nuclear pore size, 4) retaining the cargo during its transit to the cytosol or the...
2.4K
siRNA - Small Interfering RNAs
16.7K
Small interfering RNAs, or siRNAs, are short regulatory RNA molecules that can silence genes post-transcriptionally, as well as the transcriptional level in some cases. siRNAs are important for protecting cells against viral infections and silencing transposable genetic elements.
In the cytoplasm, siRNA is processed from a double-stranded RNA, which comes from either endogenous DNA transcription or exogenous sources like a virus. This double-stranded RNA is then cleaved by the...
In the cytoplasm, siRNA is processed from a double-stranded RNA, which comes from either endogenous DNA transcription or exogenous sources like a virus. This double-stranded RNA is then cleaved by the...
16.7K


