Video Experimental Relacionado
Updated: May 12, 2026
10:50
Assessment of Immunologically Relevant Dynamic Tertiary Structural Features of the HIV-1 V3 Loop Crown R2 Sequence by ab initio Folding
Published on: September 16, 2010
Estructura cristalina del dominio catalítico antiviral APOBEC3G y sus implicaciones funcionales
Lauren G Holden1, Courtney Prochnow, Y Paul Chang
1Molecular and Computational Biology, University of Southern California, Los Angeles, California 90089, USA.
Nature
|October 14, 2008
Resumen
El estudio revela la estructura cristalina de alta resolución de APOBEC3G-CD2, una proteína que restringe la replicación viral. Esta estructura aclara el sitio activo e identifica los residuos clave para la especificidad del sustrato y la unión al ADN en la familia APOBEC.
Área de la Ciencia:
- La bioquímica es la bioquímica.
- Biología Estructural Biología estructural.
- Biología Molecular Biología Molecular
Sus antecedentes:
- Las proteínas de la familia APOBEC juegan un papel crucial en varios procesos biológicos.
- Se sabe que APOBEC3G (A3G) restringe la replicación de virus como el VIH y el VHB a través de la desaminación de citidina y la unión al ARN.
Objetivo del estudio:
- Para determinar la estructura cristalina de alta resolución del dominio carboxiterminal de la desaminasa de APOBEC3G (APOBEC3G-CD2).
- Para aclarar la base estructural de la actividad de la desaminasa de APOBEC3G y la especificidad del sustrato.
Principales métodos:
- Purificación de APOBEC3G-CD2 de Escherichia coli. también conocido como Escherichia.
- Cristalografía de rayos X de alta resolución para determinar la estructura de la proteína.
- Mutagénesis dirigida al sitio para investigar la función de los residuos.
Principales resultados:
- La estructura cristalina de APOBEC3G-CD2 revela un núcleo de hoja beta de cinco hebras conservado, similar a otras deaminasas.
- Se identificó una "ranura de sustrato" distinta formada por bucles en el sitio activo, que difiere en orientación de las predicciones anteriores de RMN.
- El análisis mutacional identificó residuos clave esenciales para la especificidad del sustrato, la unión al ADN de cadena única y la actividad de la deaminasa.
Conclusiones:
- La estructura determinada proporciona una visión crítica del mecanismo de desaminasa APOBEC3G.
- Comprender el surco del sustrato y los residuos clave sienta las bases para descifrar la especificidad del sustrato de la familia APOBEC.
Más Videos Relacionados
Videos de Conceptos Relacionados
00:56Viral Structure
Viruses are extraordinarily diverse in shape and size, but they all have several structural features in common. All viruses have a core that contains a DNA- or RNA-based genome. The core is surrounded by a protective coat of proteins called the capsid. The capsid is composed of subunits called capsomeres. The capsid and genome-containing core are together known as the nucleocapsid.
01:10Antibody Structure
Overview
Antibodies, also known as immunoglobulins (Ig), are essential players of the adaptive immune system. These antigen-binding proteins are produced by B cells and make up 20 percent of the total blood plasma by weight. In mammals, antibodies fall into five different classes, which each elicits a different biological response upon antigen binding.
The Y-Shaped Structure of Antibodies Consists of Four Polypeptide Chains
Antibodies consist of four polypeptide chains: two identical heavy...
Antibodies, also known as immunoglobulins (Ig), are essential players of the adaptive immune system. These antigen-binding proteins are produced by B cells and make up 20 percent of the total blood plasma by weight. In mammals, antibodies fall into five different classes, which each elicits a different biological response upon antigen binding.
The Y-Shaped Structure of Antibodies Consists of Four Polypeptide Chains
Antibodies consist of four polypeptide chains: two identical heavy...
01:10Antibody Structure
Overview
Antibodies, also known as immunoglobulins (Ig), are essential players of the adaptive immune system. These antigen-binding proteins are produced by B cells and make up 20 percent of the total blood plasma by weight. In mammals, antibodies fall into five different classes, which each elicits a different biological response upon antigen binding.
The Y-Shaped Structure of Antibodies Consists of Four Polypeptide Chains
Antibodies consist of four polypeptide chains: two identical heavy...
Antibodies, also known as immunoglobulins (Ig), are essential players of the adaptive immune system. These antigen-binding proteins are produced by B cells and make up 20 percent of the total blood plasma by weight. In mammals, antibodies fall into five different classes, which each elicits a different biological response upon antigen binding.
The Y-Shaped Structure of Antibodies Consists of Four Polypeptide Chains
Antibodies consist of four polypeptide chains: two identical heavy...
01:56Structural Protein Function
Structural proteins are a category of proteins responsible for functions ranging from cell shape and movement to providing support to major structures such as bones, cartilage, hair, and muscles. This group includes proteins such as collagen, actin, myosin, and keratin.
Collagen, the most abundant protein in mammals, is found throughout the body. In connective tissue, such as skin, ligaments, and tendons, it provides tensile strength and elasticity. In bones and teeth, it mineralizes to form...
Collagen, the most abundant protein in mammals, is found throughout the body. In connective tissue, such as skin, ligaments, and tendons, it provides tensile strength and elasticity. In bones and teeth, it mineralizes to form...
01:56Structural Protein Function
Structural proteins are a category of proteins responsible for functions ranging from cell shape and movement to providing support to major structures such as bones, cartilage, hair, and muscles. This group includes proteins such as collagen, actin, myosin, and keratin.
Collagen, the most abundant protein in mammals, is found throughout the body. In connective tissue, such as skin, ligaments, and tendons, it provides tensile strength and elasticity. In bones and teeth, it mineralizes to form...
Collagen, the most abundant protein in mammals, is found throughout the body. In connective tissue, such as skin, ligaments, and tendons, it provides tensile strength and elasticity. In bones and teeth, it mineralizes to form...
01:23The Antiviral System of Bacteria and Archaea: CRISPR
CRISPR stands for Clustered Regularly Interspaced Short Palindromic Repeats is a adaptive immune system found in bacteria and archaea that protects against viral infections. This system enables prokaryotic cells to identify, remember, and neutralize foreign genetic elements, primarily bacteriophages, by storing fragments of the invader’s DNA as a genetic memory.The CRISPR immune response begins during an initial infection. Cas (CRISPR-associated) proteins play a central role in this defense.