概括
酵母线粒体前体RNA在没有蛋白质的情况下在体外进行自我拼接. 这一过程涉及GTP结合,外结合和内循环化,证明了RNA.
科学领域:
- 分子生物学分子生物学
- 在RNA分离过程中.
- 线粒体遗传学 线粒体遗传学
背景情况:
- 以前的研究表明,线性和圆形拼接中间体存在于线粒体RNA中,类似于Tetrahymena核糖体前体RNA自拼接中的中间体.
- 在酵母菌中线粒体RNA拼接的精确机制和蛋白质独立性仍未完全阐明.
研究的目的:
- 为了研究酵母线粒体前体RNA的体外拼接.
- 为了确定线粒体RNA拼接是否可以独立于线粒体蛋白发生.
- 描述酵母线粒体RNA自我拼接所涉及的分子事件.
主要方法:
- 在体外转录酵母大核糖体RNA基因 (包括内核和侧翼外核) 使用SP6促进体和重组等离子体.
- 在拼接条件下与alpha-32P-GTP进行转录RNA的化.
- 标记RNA物种的分析,包括切除的内核和其他相关RNA.
主要成果:
- 酵母线粒体前体RNA在体外证明了自我催化拼接,而不需要线粒体蛋白质.
- 拼接过程涉及GTP在切除的内子的5'-末端的结合,5'-和3'-外子的结合,以及内子循环化.
- 标记实验证实了GTP被纳入切除的核糖体内基因组RNA和其他来自细胞氧化酶子单元I基因内基因的RNA物种中.
结论:
- 酵母线粒体RNA拼接是一种自主,自我催化过程.
- 这些发现支持一种基于RNA的催化模型,用于酵母菌中的线粒体内子拼接.
- 这项研究提供了直接证据,证明了在真核细胞线粒体中蛋白质独立的RNA剪接.
相关概念视频
RNA Splicing
61.0K
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...
61.0K
Ribosomal RNA Synthesis
15.0K
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,...
15.0K
Ribosomal RNA Synthesis
4.7K
No description available
4.7K
Mitochondrial Precursor Proteins
3.9K
Mitochondrial precursors are partially unfolded or loosely folded polypeptide chains. Newly synthesized precursors are inhibited from spontaneously folding into their native conformation by the cytosolic chaperones, heat shock proteins 70 (Hsp70), and mitochondrial import stimulation factors (MSFs). Precursors bound to MSFs are guided to the TOM70-TOM37 receptors, while precursors bound to Hsp70 chaperones are targetted to TOM20-TOM22 receptor complexes.
Most of the mitochondrial...
Most of the mitochondrial...
3.9K
pre-mRNA Processing
57.8K
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...
57.8K
Alternative RNA Splicing
25.5K
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...
25.5K


