Video Experimental Relacionado
Updated: May 10, 2026
22:00
Crystallizing Membrane Proteins for Structure Determination using Lipidic Mesophases
Published on: November 21, 2010
30.6K
La estructura cristalina de Prp8 revela la cavidad del sitio activo del espliceosoma
Wojciech P Galej1, Chris Oubridge, Andrew J Newman
1MRC Laboratory of Molecular Biology, Francis Crick Avenue, Cambridge CB2 0QH, UK.
Nature
|January 29, 2013
Resumen
El espliceosoma es el espliceosoma.
Área de la Ciencia:
- Biología Molecular Biología Molecular
- Biología Estructural Biología Estructural
- La bioquímica es la bioquímica.
Sus antecedentes:
- El espliceosoma es una gran máquina molecular esencial para la expresión génica.
- La proteína Prp8 es un componente crucial de la pequeña partícula de ribonucleoproteína nuclear U5 dentro del espliceosoma.
- Prp8 interactúa extensamente con el núcleo catalítico del espliceosoma, incluidos los ARN y el ARN pre-mensajero.
Objetivo del estudio:
- Para determinar la estructura cristalina de la levadura Prp8 en complejo con Aar2.
- Para dilucidar la base estructural de la interacción de Prp8 con el núcleo catalítico del espliceosoma.
- Proporcionar información sobre la relación evolutiva entre el splicing de pre-ARNm nuclear y el splicing de intrones del grupo II.
Principales métodos:
- Se utilizó la cristalografía de rayos X para determinar la estructura de la levadura Prp8 (residuos 885-2413) unida a Aar2.
- El análisis estructural se centró en la identificación de dominios dentro de Prp8 y su disposición espacial.
- Mapeo de sitios funcionales conocidos, incluidos los supresores de mutaciones y enlaces cruzados, en la estructura determinada.
Principales resultados:
- La estructura cristalina reveló dominios estrechamente asociados dentro de Prp8, que se asemejan a la transcriptasa inversa de intrones del grupo II bacteriana y la endonucleasa de restricción de tipo II.
- Se identificó una gran cavidad, formada por dominios Prp8 específicos, capaces de acomodar el núcleo catalítico del ARN intrónico del grupo II.
- Los sitios funcionales asociados con las mutaciones del sitio de empalme y el empalme de intrones se localizaron en esta cavidad.
Conclusiones:
- La estructura de Prp8 proporciona información crítica sobre la arquitectura del sitio activo del espliceosoma.
- Los hallazgos apoyan un origen evolutivo común para el empalme de pre-ARNm nuclear y el empalme de intrones del grupo II.
- La cavidad identificada sugiere un mecanismo potencial para la catálisis del ARN dentro del espliceosoma.
Más Videos Relacionados
Videos de Conceptos Relacionados
01:32RNA 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...
01:32RNA 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...
02:53CRISPR and crRNAs
Bacteria and archaea are susceptible to viral infections just like eukaryotes; therefore, they have developed a unique adaptive immune system to protect themselves. Clustered regularly interspaced short palindromic repeats and CRISPR-associated proteins (CRISPR-Cas) are present in more than 45% of known bacteria and 90% of known archaea.
The CRISPR-Cas system stores a copy of foreign DNA in the host genome and uses it to identify the foreign DNA upon reinfection. CRISPR-Cas has three different...
The CRISPR-Cas system stores a copy of foreign DNA in the host genome and uses it to identify the foreign DNA upon reinfection. CRISPR-Cas has three different...
01:18ATP Synthase: Structure
ATP synthase or ATPase is among the most conserved proteins found in bacteria, mammals, and plants. This enzyme can catalyze a forward reaction in response to the electrochemical gradient, producing ATP from ADP and inorganic phosphate. ATP synthase can also work in a reverse direction by hydrolyzing ATP and generating an electrochemical gradient. Different forms of ATP synthases have evolved special features to meet the specific demands of the cell. Based on their specific feature, ATP...
01:32Pre-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...
02:41Chromatin Structure and RNA Splicing
In eukaryotic cells, nascent mRNA transcripts need to undergo many post-transcriptional modifications to reach the cell cytoplasm and translate into functional proteins. For a long time, transcription and pre-mRNA processing were considered two independent events that occur sequentially in the cell. However, it has now been well established that transcription and pre-mRNA processing are two simultaneous processes that are precisely regulated inside the cell.
The chromatin structure, especially...
The chromatin structure, especially...