识别功能性的U1 snRNA-pre-mRNA复合体,致力于拼接体组装和拼接
1Howard Hughes Medical Institute, Department of Biology, Brandeis University, Waltham, Massachusetts 02254.
Cell
|October 20, 1989
概括
研究人员通过削减U1或U2小核核核蛋白蛋白 (snRNP) 来探索内核识别和结合体组装. 一个稳定的,U2独立的复杂形式,需要U1 snRNP用于拼接承诺.
科学领域:
- 分子生物学分子生物学
- 在RNA生物学,RNA生物学.
- 基因表达 基因表达
背景情况:
- U1和U2小型核核核糖核蛋白 (snRNP) 在早期结合体组装和内核识别中的确切作用仍然不清楚.
- 了解这些作用对于阐明前mRNA拼接的基本机制至关重要.
研究的目的:
- 研究U1和U2 snRNP在结合体形成的初始阶段的不同功能.
- 识别和描述早期拼接中间体及其分子组成.
主要方法:
- 开发了一种新的方法,在Saccharomyces cerevisiae中制造出缺少U1或U2 snRNP的拼接提取物.
- 利用补充分析和追逐实验来追踪复杂的形成和功能.
- 采用专门的凝电泳技术来识别和分析拼接复合体.
主要成果:
- 一个稳定的,连接承诺的复杂形式,即使没有U2 snRNP.
- 这种承诺复合体的最佳形成需要U1 snRNP和特定的基质序列 (5'拼接点和分支点).
- 这些承诺的复合体含有U1 snRNA,并在结合体组装和拼接中充当中间体.
结论:
- 该研究表明,U1 snRNP在结合的早期承诺步骤中发挥着关键作用,独立于U2 snRNP.
- 这些发现为结合部位选择和结合体的顺序组装提供了新的见解.
相关概念视频
RNA Splicing
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...
Pre-mRNA Processing
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 guanosine). This 5’ cap helps the...
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 guanosine). This 5’ cap helps the...
RNA Splicing
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...
Alternative RNA Splicing
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...
Pre-mRNA Processing: RNA Splicing
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...
Alternative RNA Splicing
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...


