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RNA Structure01:23

RNA Structure

Overview
The basic structure of RNA consists of a five-carbon sugar and one of four nitrogenous bases. Although most RNA is single-stranded, it can form complex secondary and tertiary structures. Such structures play essential roles in the regulation of transcription and translation.
Different Types of RNA Have the Same Basic Structure
There are three main types of ribonucleic acid (RNA): messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). All three RNA types consist of a...
RNA Structure01:23

RNA Structure

Overview
The basic structure of RNA consists of a five-carbon sugar and one of four nitrogenous bases. Although most RNA is single-stranded, it can form complex secondary and tertiary structures. Such structures play essential roles in the regulation of transcription and translation.
Different Types of RNA Have the Same Basic Structure
There are three main types of ribonucleic acid (RNA): messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). All three RNA types consist of a...
RNA Structure01:19

RNA Structure

The basic structure of RNA consists of a string of ribonucleotides attached by phosphodiester bonds. Although most RNA is single-stranded, it can form complex secondary and tertiary structures. Such structures play essential roles in the regulation of transcription and translation.
Different Types of RNA Have the Same Basic Structure
There are three main types of ribonucleic acid (RNA) involved in protein synthesis: messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). All three...
RNA Stability01:53

RNA Stability

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...
RNA Stability01:53

RNA Stability

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...
Nucleic Acid Structure01:25

Nucleic Acid Structure

The pentose sugar in DNA is deoxyribose, while in RNA the pentose sugar is ribose. The difference between the sugars is the presence of the hydroxyl group on the ribose's second carbon and a hydrogen on the deoxyribose's second carbon. The phosphate residue attaches to the hydroxyl group of the 5′ carbon of one sugar and the hydroxyl group of the 3′ carbon of the sugar of the next nucleotide, which forms  a 5′ to 3′ phosphodiester linkage.
DNA Structure
DNA has a double-helix structure. The...

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Video Experimental Relacionado

Updated: Jun 28, 2026

RNA Secondary Structure Prediction Using High-throughput SHAPE
13:42

RNA Secondary Structure Prediction Using High-throughput SHAPE

Published on: May 31, 2013

Resolución en el tiempo de la química del ARN SHAPE.

Stefanie A Mortimer1, Kevin M Weeks

  • 1Department of Chemistry, University of North Carolina, Chapel Hill, North Carolina 27599-3290, USA.

Journal of the American Chemical Society
|November 13, 2008
PubMed
Resumen
Este resumen es generado por máquina.

Este estudio introduce la química SHAPE resuelta en el tiempo para la cinética de plegamiento del ARN. Revela que la estructura terciaria del ARN se forma en dos pasos, con interacciones de largo alcance que limitan la velocidad general de plegamiento.

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RNA Secondary Structure Prediction Using High-throughput SHAPE
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RNA Secondary Structure Prediction Using High-throughput SHAPE

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Área de la Ciencia:

  • La bioquímica es la bioquímica.
  • Biología Molecular Biología Molecular
  • Biología Estructural Biología estructural.

Sus antecedentes:

  • La acilación selectiva de 2'-hidroxilo analizada por extensión de primer (SHAPE) proporciona una resolución de un solo nucleótido de la estructura del ARN.
  • Los métodos SHAPE existentes son adecuados para estructuras de equilibrio, pero limitados para estudios cinéticos.
  • Comprender la dinámica de plegamiento del ARN es crucial para elucidar las funciones biológicas.

Objetivo del estudio:

  • Desarrollar una química SHAPE con resolución temporal para estudios cinéticos del plegamiento del ARN.
  • Para investigar la formación paso a paso de las interacciones terciarias durante el plegamiento del ARN.
  • Para determinar los pasos que limitan la velocidad en el plegamiento del ARN del dominio de especificidad de la RNasa P. ARN.

Principales métodos:

  • Extensión de la química SHAPE utilizando un andamio de cianuro de benzoilo para mediciones cinéticas rápidas (aprox. 1 s de instantáneas).
  • Aplicación de SHAPE con resolución temporal para monitorear el plegamiento de un ARN de dominio de especificidad RNase P. ARN.
  • Análisis de la flexibilidad y reactividad de los nucleótidos para inferir cambios estructurales a lo largo del tiempo.

Principales resultados:

  • Las interacciones terciarias en el dominio RNase P del ARN se forman en dos pasos cinéticos distintos.
  • Los contactos terciarios locales se forman significativamente más rápido que las interacciones de largo alcance.
  • El plegamiento global está limitado por la formación simultánea de interacciones distantes, no por la interrupción de estructuras no nativas.

Conclusiones:

  • La química SHAPE con resolución temporal permite estudios cinéticos fáciles del plegamiento del ARN a una resolución de un solo nucleótido.
  • El plegamiento del ARN implica etapas distintas, siendo la formación de contactos terciarios de largo alcance un paso clave que limita la velocidad.
  • Esta metodología tiene un amplio potencial para estudiar la dinámica estructural del ARN y los cambios conformacionales en diversos contextos biológicos.