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Intact DNA strands can be found in fossils, while scientists sometimes struggle to keep RNA intact under laboratory conditions. The structural variations between RNA and DNA underlie the differences in their stability and longevity. Because DNA is double-stranded, it is inherently more stable. The single-stranded structure of RNA is less stable but also more flexible and can form weak internal bonds. Additionally, most RNAs in the cell are relatively short, while DNA can be up to 250 million...
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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...
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Control de ARN por acilación fotorreversible

Willem A Velema1, Anna M Kietrys1, Eric T Kool1

  • 1Department of Chemistry , Stanford University , Stanford , California 94305 , United States.

Journal of the American Chemical Society
|February 24, 2018
PubMed
Resumen
Este resumen es generado por máquina.

Los investigadores desarrollaron un nuevo método para el fotocontrol externo de la función del ARN. Esta técnica permite la conmutación óptica de la hibridación del ARN y la actividad catalítica, ampliando las aplicaciones en estudios biológicos.

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Área de la Ciencia:

  • Biología molecular
  • La bioquímica
  • Biología Química

Sus antecedentes:

  • El fotocontrol externo de la función del ARN es crucial para el estudio de la biología del ácido nucleico.
  • Los métodos actuales que utilizan nucleobases fotoenjauladas están limitados a ARN sintéticos cortos.

Objetivo del estudio:

  • Desarrollar un nuevo método post-sintético para el fotocontrol del ARN.
  • Para permitir el control óptico de la hibridación del ARN, el plegamiento y la función catalítica.

Principales métodos:

  • Acilación posintética de grupos 2'-hidroxilo con grupos fotoprotectores.
  • Introducción en un solo paso de grupos fotoprotectores para bloquear y restaurar la hibridación del ARN.
  • Aplicación de poliacilación (camuflaje) para controlar la actividad de la ribozima de cabeza de martillo.
  • Demostración en un aptamer de ARN 237 nt transcrito para estudios celulares.

Principales resultados:

  • Bloquea eficazmente la hibridación del ARN, que es reversible tras la exposición a la luz.
  • Demuestra el control óptico sobre la función catalítica del ARN utilizando una ribozima cabeza de martillo.
  • Enciende con éxito el plegamiento del ARN en un contexto celular utilizando un aptamer transcrito.

Conclusiones:

  • El nuevo método de acilación posintética proporciona fotocontrol sobre la función del ARN.
  • Este enfoque expande la utilidad de los ARN fotocontrolables para los estudios biológicos.
  • El método muestra potencial para aplicaciones que requieren la conmutación óptica del comportamiento del ARN en las células.