Video Experimental Relacionado
Updated: Jul 1, 2026
10:52
Sample Preparation for Mass Spectrometry-based Identification of RNA-binding Regions
Published on: September 28, 2017
Estructura y unión al ARN conservado del dominio PAZ
Kelley S Yan1, Sherry Yan, Amjad Farooq
1Structural Biology Program, Department of Physiology and Biophysics, Mount Sinai School of Medicine, New York University, One Gustave L. Levy Place, New York, New York 10029-6574, USA.
Nature
|November 15, 2003
Resumen
El dominio PAZ, crucial para el silenciamiento del ARN, se une a moléculas cortas de ARN. Este estudio revela su estructura y función de unión de ARN conservada en proteínas argonautas.
Área de la Ciencia:
- Biología Molecular Biología Molecular
- Biología Estructural Biología estructural.
- Genética La genética.
Sus antecedentes:
- El silenciamiento de genes mediado por ARN es vital para la regulación genética eucariota y la defensa antiviral.
- Las proteínas Dicer y Argonaute son actores clave en estas vías, con un dominio PAZ conservado.
- La función bioquímica del dominio PAZ ha permanecido elusiva.
Objetivo del estudio:
- Para determinar la estructura de la solución de resonancia magnética nuclear del dominio PAZ de Drosophila melanogaster Argonaute 1 (Ago1).
- Aclarar la función bioquímica del dominio PAZ, específicamente sus capacidades de unión al ARN.
Principales métodos:
- Se utilizó la espectroscopia de resonancia magnética nuclear (RMN) para determinar la estructura 3D del dominio Ago1 PAZ.
- Se realizaron análisis bioquímicos para investigar la unión al ARN.
- Se integraron datos estructurales y bioquímicos para mapear el sitio de unión al ARN.
Principales resultados:
- El dominio PAZ adopta una estructura de barril beta de seis hebras zurda con tapas en forma de hélice alfa y un apéndice en forma de horquilla beta.
- El dominio PAZ se une a una molécula de ARN de 5 nucleótidos con estequiometría 1:1.
- La superficie de unión de ARN se mapeó a la cara abierta del cañón beta, definiendo la orientación 5'-a-3' del ARN unido.
- Los dominios PAZ de las proteínas argonautas humanas también exhiben una función de unión de ARN conservada.
Conclusiones:
- La estructura del dominio PAZ revela su arquitectura molecular.
- El dominio PAZ se une directamente a los ARN cortos, esenciales para las vías de silenciamiento del ARN.
- Esta función conservada en todas las especies subraya la importancia del dominio PAZ en la regulación génica.
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...
02:26Conservation of Protein Domains Over Different Proteins
Protein domains are small structurally independent units that are part of a single amino acid chain. Although these domains are often structurally independent, they may rely on synergistic effects to perform their functions as part of a larger protein. Protein domains may be conserved within the same organism, as well as across different organisms.
A limited set of protein domains often duplicate and recombine during evolution. These domains can be organized in different combinations to form...
A limited set of protein domains often duplicate and recombine during evolution. These domains can be organized in different combinations to form...
01:49Conserved Binding Sites
Many proteins’ biological role depends on their interactions with their ligands, small molecules that bind to specific locations on the protein known as ligand-binding sites. Ligand-binding sites are often conserved among homologous proteins as these sites are critical for protein function.
Binding sites are often located in large pockets, and if their location on a protein’s surface is unknown, it can be predicted using various approaches. The energetic method computationally analyses the...
Binding sites are often located in large pockets, and if their location on a protein’s surface is unknown, it can be predicted using various approaches. The energetic method computationally analyses the...
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...
01:49Conserved Binding Sites
Many proteins’ biological role depends on their interactions with their ligands, small molecules that bind to specific locations on the protein known as ligand-binding sites. Ligand-binding sites are often conserved among homologous proteins as these sites are critical for protein function.
Binding sites are often located in large pockets, and if their location on a protein’s surface is unknown, it can be predicted using various approaches. The energetic method computationally analyses the...
Binding sites are often located in large pockets, and if their location on a protein’s surface is unknown, it can be predicted using various approaches. The energetic method computationally analyses the...
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...