Video Experimental Relacionado
Updated: Jul 9, 2026
09:15
Monitoring Protein-RNA Interaction Dynamics In Vivo at High Temporal Resolution Using χCRAC
Published on: May 9, 2020
Visualizar dinámicas correlacionadas espacialmente que dirigen las transiciones conformacionales del ARN
Qi Zhang1, Andrew C Stelzer, Charles K Fisher
1Department of Chemistry and Biophysics, University of Michigan, 930 North University Avenue, Ann Arbor, Michigan 48109-1055, USA.
Nature
|December 22, 2007
Resumen
Los investigadores visualizaron la dinámica del ARN utilizando RMN, revelando movimientos estructurados que guían los cambios conformacionales inducidos por ligandos. Este estudio descubre cómo la flexibilidad del ARN dirige las transiciones a lo largo de vías específicas.
Área de la Ciencia:
- La bioquímica es la bioquímica.
- Biología Estructural Biología estructural.
- La biofísica molecular es la biofísica molecular.
Sus antecedentes:
- Las moléculas de ARN se pliegan en complejas estructuras 3D esenciales para las funciones celulares.
- Estas estructuras experimentan transiciones conformacionales influenciadas por las señales celulares.
- Visualizar los movimientos atómicos y la dinámica en el ARN ha sido experimentalmente desafiante.
Objetivo del estudio:
- Desarrollar y aplicar una nueva estrategia de RMN para visualizar la dinámica del ARN con alta resolución.
- Investigar la relación entre la estructura del ARN, la flexibilidad y las transiciones conformacionales.
- Para entender cómo la dinámica del ARN dirige los cambios conformacionales inducidos por ligandos.
Principales métodos:
- Se utilizó la espectroscopia de resonancia magnética nuclear (RMN).
- Desarrolló una estrategia de anclaje de los marcos de referencia de RMN en las hélices individuales de ARN.
- Se emplearon conjuntos "relativistas" de acoplamientos dipolares residuales (RDC) para medir la dinámica entre hélices.
Principales resultados:
- Se han visualizado con éxito movimientos de hélice de gran amplitud en el ARN con una sensibilidad rotacional 3D completa.
- Se observaron torsiones correlacionadas (hasta 110 grados) y flexión (aprox. 94 grados) de las hélices de ARN vinculadas.
- Identificó siete distintas conformaciones ligando-unidas a lo largo de la trayectoria dinámica.
Conclusiones:
- La dinámica del ARN puede ser sorprendentemente estructurada, trazando trayectorias 3D definidas.
- Esta dinámica estructurada guía las transiciones inducidas por ligandos a lo largo de caminos conformacionales específicos.
- Incluso los ARN parcialmente no estructurados exhiben dinámicas que dirigen los cambios conformacionales funcionales.
Videos de Conceptos Relacionados
01:23RNA 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...
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...
01:23RNA 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...
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...
01:19RNA 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...
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...
01:53RNA 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...
01:53RNA 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...
00:52¹H NMR of Conformationally Flexible Molecules: Temporal Resolution
At room temperature, the chair conformer of cyclohexane undergoes rapid ring flipping between two equivalent chair conformers at a rate of approximately 105 times per second. These two chair conformers are in equilibrium. The rapid ring flipping results in the interconversion of the axial proton to an equatorial proton and an equatorial to the axial proton. Such interconversions are too rapid and cannot be detected on the NMR timescale. Hence, the NMR spectrometer cannot distinguish between the...