Video Experimental Relacionado
Updated: May 28, 2026

11:48
Detection of Alternative Splicing During Epithelial-Mesenchymal Transition
Published on: October 9, 2014
El empalme in vitro de proteínas del precursor purificado y la identificación de un intermediario ramificado
M Q Xu1, M W Southworth, F B Mersha
1New England Biolabs, Beverly, Massachusetts 01915.
Cell
|December 31, 1993
Resumen
Este estudio proporciona evidencia directa para el empalme de proteínas, un proceso en el que se elimina un segmento de proteína y se unen las partes restantes. Experimentos in vitro demostraron que este mecanismo de empalme es dependiente de la temperatura y el pH.
Área de la Ciencia:
- La bioquímica es la bioquímica.
- Biología Molecular Biología Molecular
- Química de las proteínas química de las proteínas.
Sus antecedentes:
- El empalme de proteínas es una modificación crucial después de la traducción.
- Se trata de la escisión de un polipéptido interno y la ligadura de las secuencias de flanqueo.
- Este proceso da como resultado la formación de dos proteínas distintas a partir de un solo precursor.
Objetivo del estudio:
- Para proporcionar evidencia directa para el empalme de proteínas.
- Para investigar el empalme in vitro de un precursor de proteína que contiene el elemento de empalme de la polimerasa de ADN de Pyrococcus.
- Para caracterizar las condiciones que afectan el empalme de proteínas.
Principales métodos:
- Clonar el elemento de empalme de proteínas de la ADN polimerasa de Pyrococcus en un gen extraño.
- Purificando las proteínas precursoras acumuladas.
- Realización de ensayos de empalme in vitro.
- Analizando los intermediarios de empalme utilizando la secuenciación N-terminal.
- Investigando los efectos de la temperatura y el pH en el empalme.
Principales resultados:
- Se demostró evidencia directa para el empalme de proteínas in vitro.
- Se encontró que la actividad de empalme era dependiente de la temperatura y el pH.
- Una especie de migración lenta, identificada como una molécula ramificada a través de la secuenciación N-terminal, exhibió características de un intermediario de empalme.
- Las especies precursoras e intermedias eran interconvertibles en los cambios de pH.
Conclusiones:
- El empalme de proteínas se puede demostrar y estudiar in vitro.
- La temperatura y el pH son factores críticos que regulan la eficiencia del empalme de proteínas.
- Un intermediario ramificado está involucrado en el mecanismo de empalme de proteínas.
- Los hallazgos contribuyen a la comprensión de los mecanismos moleculares del procesamiento de proteínas.
Videos de Conceptos Relacionados
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...

