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The organelle-specific signaling sequences direct proteins synthesized in the cytosol to their final destination like ER, mitochondria, peroxisomes, etc. Some of the proteins directed to ER are then trafficked via vesicles to other organelles within the cell or the extracellular environment through the Golgi complex. For example, the rough ER synthesizes soluble proteins for transportation to the lysosomes or secretion out of the cell. It can also synthesize transmembrane proteins that can...
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Video Experimental Relacionado

Updated: Jan 8, 2026

Using SecM Arrest Sequence as a Tool to Isolate Ribosome Bound Polypeptides
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Múltiples puntos de control aseguran que los ribosomas tengan el extremo correcto

Jacob Gordon1,2,3,4, Robin E Stanley1

  • 1Signal Transduction Laboratory, National Institute of Environmental Health Sciences, National Institutes of Health, Department of Health and Human Services, Research Triangle Park, Durham, North Carolina, United States of America.

PLoS biology
|December 23, 2025
PubMed
Resumen

La endorribonucleasa Nob1 procesa el extremo 3' del ARN ribosomal 18S. Múltiples puntos de control celulares aseguran un procesamiento preciso, previniendo errores de traducción con ARN ribosomal incorrecto.

Palabras clave:
ARN ribosomalbiogénesis de ribosomasNob1puntos de controlfidelidad de traducción

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Área de la Ciencia:

  • Biología Molecular
  • Biología Celular
  • Genética

Sus antecedentes:

  • La biogénesis de ribosomas es crucial para la síntesis de proteínas.
  • La endorribonucleasa Nob1 es responsable del procesamiento del extremo 3' del ARN ribosomal 18S.
  • Los mecanismos que aseguran la precisión de este procesamiento no estaban claros.

Objetivo del estudio:

  • Elucidar los mecanismos celulares que aseguran la precisión de la formación del extremo 3' del ARN ribosomal 18S.
  • Identificar los puntos de control que regulan la maduración del ribosoma y la iniciación de la traducción.

Principales métodos:

  • Se utilizaron enfoques genéticos y bioquímicos.
  • Se investigó la función de Nob1 y su interacción con otros factores celulares.
  • Se analizaron los intermedios de ensamblaje de ribosomas y su competencia funcional.

Principales resultados:

  • Se identificaron múltiples puntos de control de calidad en la vía de biogénesis de ribosomas.
  • Se demostró que estos puntos de control evitan la participación de ribosomas con extremos 3' procesados incorrectamente en la traducción.
  • Se reveló una nueva capa de regulación que garantiza la fidelidad de la traducción.

Conclusiones:

  • La precisión celular en el procesamiento del extremo 3' del ARN ribosomal 18S se mantiene mediante un sistema de puntos de control de varios pasos.
  • Estos puntos de control son esenciales para prevenir errores de traducción y mantener la integridad del proteoma.
  • Los hallazgos proporcionan nuevas perspectivas sobre la regulación de la biogénesis y la función de los ribosomas.