Video Experimental Relacionado
Updated: Jul 9, 2026
10:59
Artificial RNA Polymerase II Elongation Complexes for Dissecting Co-transcriptional RNA Processing Events
Published on: May 13, 2019
La serina-7 de la ARN polimerasa II CTD se requiere específicamente para la expresión génica del snRNA
Sylvain Egloff1, Dawn O'Reilly, Rob D Chapman
1Sir William Dunn School of Pathology, University of Oxford, South Parks Road, Oxford OX1 3RE, UK.
Science (New York, N.Y.)
|December 15, 2007
Resumen
La mutación de la serina-7 en la ARN polimerasa II (Pol II) afecta específicamente la expresión génica del ARN nuclear pequeño (ARNn). Este residuo de serina es crucial para la función de Pol II e interactúa con el complejo Integrator, apoyando un modelo de código CTD.
Área de la Ciencia:
- Biología Molecular Biología Molecular
- Reglamento genético Reglamento genético.
- La bioquímica es la bioquímica.
Sus antecedentes:
- La ARN polimerasa II (Pol II) transcribe los genes de ARN codificantes y no codificantes de proteínas.
- El dominio C-terminal Pol II (CTD) es vital para la expresión génica.
- El CTD consiste en repeticiones en tándem de una secuencia de consenso heptapeptídico.
Objetivo del estudio:
- Para investigar el papel de la serina-7 dentro de la repetición heptapeptídica del Pol II CTD.
- Determinar el significado funcional de la fosforilación de la serina-7 en la transcripción génica.
Principales métodos:
- Mutagénesis dirigida al sitio de la serina-7 a la alanina en el CTD Pol II.
- Análisis del snRNA y la expresión génica codificadora de proteínas.
- Investigando la interacción entre la serina-7 fosforilada y el complejo Integrator.
Principales resultados:
- La mutación de la serina-7 a la alanina interrumpe específicamente la expresión génica del snRNA.
- La fosforilación de la serina-7 mejora la interacción con el complejo integrador.
- Esto pone de relieve una función específica del tipo de gen para la serina-7 en el CTD.
Conclusiones:
- La serina-7 en el CTD Pol II tiene una función distinta en la expresión génica del snRNA.
- La fosforilación de la serina-7 es crítica para el reclutamiento del complejo Integrator.
- Estos hallazgos apoyan un modelo de "código CTD" para la regulación diferencial de genes.
Videos de Conceptos Relacionados
00:58Eukaryotic RNA Polymerases
RNA Polymerase (RNAP) is conserved in all animals, with bacterial, archaeal, and eukaryotic RNAPs sharing significant sequence, structural, and functional similarities. Among the three eukaryotic RNAPs, RNA Polymerase II is most similar to bacterial RNAP in terms of both structural organization and folding topologies of the enzyme subunits. However, these similarities are not reflected in their mechanism of action.
All three eukaryotic RNAPs require specific transcription factors, of which the...
All three eukaryotic RNAPs require specific transcription factors, of which the...
00:58Eukaryotic RNA Polymerases
RNA Polymerase (RNAP) is conserved in all animals, with bacterial, archaeal, and eukaryotic RNAPs sharing significant sequence, structural, and functional similarities. Among the three eukaryotic RNAPs, RNA Polymerase II is most similar to bacterial RNAP in terms of both structural organization and folding topologies of the enzyme subunits. However, these similarities are not reflected in their mechanism of action.
All three eukaryotic RNAPs require specific transcription factors, of which the...
All three eukaryotic RNAPs require specific transcription factors, of which the...
01:47Transcription Initiation
Initiation is the first step of transcription in eukaryotes. Prokaryotic RNA Polymerase (RNAP) can bind to the template DNA and start transcribing. On the other hand, transcription in eukaryotes requires additional proteins, called transcription factors, to first bind to the promoter region in the DNA template. This binding helps recruit the specific RNAP that can assemble on the DNA and start transcription.
The promoters and enhancers and their accessory proteins allow tight regulation of...
The promoters and enhancers and their accessory proteins allow tight regulation of...
03:21RNA-seq
RNA sequencing, or RNA-Seq, is a high-throughput sequencing technology used to study the transcriptome of a cell. Transcriptomics helps to interpret the functional elements of a genome and identify the molecular constituents of an organism. Additionally, it also helps in understanding the development of an organism and the occurrence of diseases.
Before the discovery of RNA-seq, microarray-based methods and Sanger sequencing were used for transcriptome analysis. However, while microarray-based...
Before the discovery of RNA-seq, microarray-based methods and Sanger sequencing were used for transcriptome analysis. However, while microarray-based...
02:36RNA Polymerase II Accessory Proteins
Proteins that regulate transcription can do so either via direct contact with RNA Polymerase or through indirect interactions facilitated by adaptors, mediators, histone-modifying proteins, and nucleosome remodelers. Direct interactions to activate transcription is seen in bacteria as well as in some eukaryotic genes. In these cases, upstream activation sequences are adjacent to the promoters, and the activator proteins interact directly with the transcriptional machinery. For example, in...
02:36RNA Polymerase II Accessory Proteins
Proteins that regulate transcription can do so either via direct contact with RNA Polymerase or through indirect interactions facilitated by adaptors, mediators, histone-modifying proteins, and nucleosome remodelers. Direct interactions to activate transcription is seen in bacteria as well as in some eukaryotic genes. In these cases, upstream activation sequences are adjacent to the promoters, and the activator proteins interact directly with the transcriptional machinery. For example, in...