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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...
RNA Splicing01:32

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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...
Nuclear Export of mRNA02:31

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Before mRNAs are exported to the cytoplasm, it is crucial to check each mRNA for structural and functional integrity. Eukaryotic cells use several different mechanisms, collectively known as mRNA surveillance, to look for irregularities in mRNAs. Irregular or aberrant mRNA are rapidly degraded by various enzymes. If a defective mRNA escapes the surveillance, it would be translated into a protein which would either be non-functional or not function properly. One of the primary irregularities in...
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Before mRNAs are exported to the cytoplasm, it is crucial to check each mRNA for structural and functional integrity. Eukaryotic cells use several different mechanisms, collectively known as mRNA surveillance, to look for irregularities in mRNAs. Irregular or aberrant mRNA are rapidly degraded by various enzymes. If a defective mRNA escapes the surveillance, it would be translated into a protein which would either be non-functional or not function properly. One of the primary irregularities in...

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Isolation and Characterization of RNA-Containing Exosomes
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Published on: January 9, 2012

El exosoma: un complejo de procesamiento de ARN eucariótico conservado que contiene múltiples 3'-->5'

P Mitchell1, E Petfalski, A Shevchenko

  • 1European Molecular Biology Laboratory, Heidelberg, Germany.

Cell
|December 9, 1997
PubMed
Resumen

Los investigadores descubrieron el exosoma de la levadura, un complejo proteico esencial para el procesamiento del ARN. Este complejo, compuesto por cinco proteínas clave, juega un papel crucial en el procesamiento de los extremos 3' del ARN ribosomal 5.8S.

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Área de la Ciencia:

  • Biología Molecular Biología Molecular
  • La bioquímica es la bioquímica.
  • Genética La genética.

Sus antecedentes:

  • El exosoma es un complejo de proteínas que se encuentra en las células eucariotas.
  • Su función en el procesamiento del ARN es crítica para la función celular.

Objetivo del estudio:

  • Para identificar y caracterizar los componentes proteicos del exosoma de la levadura.
  • Investigar las actividades enzimáticas y las funciones funcionales del exosoma en el procesamiento del ARN.

Principales métodos:

  • Aislamiento e identificación del complejo proteico en Saccharomyces cerevisiae (levadura).
  • Análisis de homología con enzimas bacterianas.
  • Caracterización in vitro de las actividades enzimáticas de las proteínas exosómicas recombinantes.
  • Ensayos funcionales que involucran el procesamiento del ARN, específicamente la maduración del ARNr 5.8S.

Principales resultados:

  • Identificación del complejo exosómico de la levadura, compuesto por cinco proteínas esenciales: Rrp4p, Rrp41p, Rrp42p, Rrp43p y Rrp44p (Dis3p).
  • Cuatro proteínas exosómicas muestran homología a las exoribonucleasas bacterianas de 3'-->5'.
  • Las Rrp4p, Rrp44p y Rrp41p recombinantes exhiben distintas actividades de exoribonucleasa (distributivas, procesivas, fosforolíticas).
  • Todos los componentes exosómicos son necesarios para el procesamiento 3' del ARNr 5.8S.
  • Un complejo homólogo existe en los seres humanos, con Rrp4p humano complementando mutaciones de levadura.

Conclusiones:

  • El exosoma de la levadura es un complejo de procesamiento de ARN eucariótico conservado.
  • El exosoma juega un papel vital en la maduración del ARN ribosomal.
  • Los componentes de proteínas identificados y sus actividades proporcionan información sobre el metabolismo del ARN eucariota.