对于保存的分支点序列的古老竞争影响了拼接中的生理和进化结果
Karen Larissa Pereira de Castro1, Jose M Abril1, Kuo-Chieh Liao2
1Transplant Division, Department of Surgery, University of Texas Medical Branch, Galveston, TX, USA.
bioRxiv : the preprint server for biology
|October 17, 2024
概括
动 (QKI) 蛋白质通过与SF1/BBP竞争特定的内子分支点序列来抑制拼接. 这种竞争调节了eukaryotes中的替代拼接和基因表达.
科学领域:
- 分子生物学分子生物学
- 在RNA分离过程中.
- 基因规则 基因规则
背景情况:
- 结合体组装涉及识别内子分支点序列,这对于mRNA处理至关重要.
- 支点图案 (UACUAAC) 保存,但多个蛋白质可以在某些物种中识别它.
- SF1和Quaking (QKI) 是参与分支点识别的蛋白质.
研究的目的:
- 为了研究SF1和QKI在特定的内部分支点序列之间的竞争性相互作用.
- 阐明QKI抑制替代拼接的机制.
- 了解QKI介导的拼接压制的功能后果.
主要方法:
- 使用突变报告员测定与含有双分支点类序列的自然内子.
- 分析了蛋白质结合亲缘关系和分支点位点的占用.
- 在芽酵母中进行了QKI的子宫外表达,以评估其拼接效应.
主要成果:
- SF1激活了外体纳入,而QKI则在ACUAA分支点序列中抑制了它.
- 在双分支点位点的QKI结合阻止了SF1结合和spliceosome因子的招募.
- 酵母中的子宫外QKI表达因广泛的拼接抑制而导致致命性.
结论:
- 通过在特定的分支点序列上直接与SF1/BBP竞争,QKI充当了拼接抑制器.
- 这种竞争机制调节了替代拼接和基因表达.
- QKI和退化的分支点序列可能已经共同进化,以保持特定的基因表达模式.
相关概念视频
Conserved Binding Sites
4.2K
Many proteins’ biological role depends on their interactions with their ligands, small molecules that bind to specific locations on the protein known as ligand-binding sites. Ligand-binding sites are often conserved among homologous proteins as these sites are critical for protein function.
Binding sites are often located in large pockets, and if their location on a protein’s surface is unknown, it can be predicted using various approaches. The energetic method computationally...
Binding sites are often located in large pockets, and if their location on a protein’s surface is unknown, it can be predicted using various approaches. The energetic method computationally...
4.2K
Multi-species Conserved Sequences
3.9K
Next-generation sequencing technologies have created large genomic databases of a variety of animals and plants. Ever since the human genome project was completed, scientists studied the genome of primates, mammals, and other phylogenetically distant living beings. Such large-scale studies have provided new insights into the evolutionary relationship between organisms.
Although the genome of each species varies greatly from each other, a few sequences are highly conserved. Such conserved...
Although the genome of each species varies greatly from each other, a few sequences are highly conserved. Such conserved...
3.9K
Alternative RNA Splicing
21.0K
Alternative RNA splicing is the regulated splicing of exons and introns to produce different mature mRNAs from a single pre-mRNA. Unlike in constitutive splicing where a single gene produces a single type of mRNA, alternative splicing allows an organism to produce multiple proteins from a single gene and plays an important role in protein diversity.
There are five types of alternative RNA splicing that vary in the ways the pre-mRNA segments are removed or retained in the mature mRNA. The first...
There are five types of alternative RNA splicing that vary in the ways the pre-mRNA segments are removed or retained in the mature mRNA. The first...
21.0K
RNA Splicing
56.1K
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...
56.1K
Pre-mRNA Processing: RNA Splicing
5.2K
5.2K
Gene Evolution - Fast or Slow?
7.0K
The genomes of eukaryotes are punctuated by long stretches of sequence which do not code for proteins or RNAs. Although some of these regions do contain crucial regulatory sequences, the vast majority of this DNA serves no known function. Typically, these regions of the genome are the ones in which the fastest change, in evolutionary terms, is observed, because there is typically little to no selection pressure acting on these regions to preserve their sequences.
In contrast, regions which code...
In contrast, regions which code...
7.0K


