Video Experimental Relacionado
Updated: Aug 14, 2026
16:24
Analyzing and Building Nucleic Acid Structures with 3DNA
Published on: April 26, 2013
Inusual arquitectura tipo Rel en el dominio de unión al ADN del factor de transcripción NFATcc
1Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, USA.
Nature
|January 9, 1997
Resumen
Los investigadores identificaron el dominio de unión al ADN NFATc (NFATc-DBD), crucial para la regulación de la respuesta inmune. Este descubrimiento ayuda en el desarrollo de nuevos fármacos dirigidos directamente a los NFAT, lo que potencialmente reduce los efectos secundarios de la terapia inmunosupresora.
Área de la Ciencia:
- Biología Molecular Biología Molecular
- Inmunología Inmunología.
- Biología Estructural Biología estructural.
Sus antecedentes:
- Las proteínas del factor nuclear de las células T activadas (NFAT) regulan las respuestas inmunes.
- Los inmunosupresores actuales como FK506 y ciclosporina A (CsA) se dirigen a la señalización de NFAT pero causan efectos secundarios tóxicos.
- Los antagonistas directos del NFAT podrían ofrecer alternativas más seguras.
Objetivo del estudio:
- Para identificar y caracterizar el dominio de unión al ADN de NFATc (NFATc-DBD).
- Determinar la estructura de solución de NFATc-DBD para el diseño de fármacos basado en la estructura.
- Para comprender los mecanismos de activación de la transcripción y de unión al ADN de NFAT.
Principales métodos:
- Expresión de proteínas y purificación de NFATc-DBD.
- Espectroscopia de Resonancia Magnética Nuclear (RMN) para la determinación de la estructura.
- Análisis estructural comparado con NF-kappaB p50.
Principales resultados:
- El dominio de unión NFATc-ADN de 20 kDa (NFATc-DBD) fue identificado como necesario y suficiente para la unión al ADN y la activación transcripcional.
- Se determinó la estructura de la solución de NFATc-DBD.
- NFATc-DBD emplea una estrategia de reconocimiento de ADN distinta en comparación con NF-kappaB p50.
- Se propuso un modelo para el complejo cooperativo de NFAT y AP-1 en el potenciador de la interleucina-2.
Conclusiones:
- La estructura NFATc-DBD proporciona una base para el diseño de nuevos inmunosupresores dirigidos a NFAT.
- Comprender el mecanismo de unión al ADN de NFAT es clave para desarrollar estrategias terapéuticas más seguras.
- Este trabajo facilita el desarrollo de antagonistas con toxicidad potencialmente reducida en comparación con los medicamentos actuales.
Más Videos Relacionados
09:52A Chromatin Immunoprecipitation Assay to Identify Novel NFAT2 Target Genes in Chronic Lymphocytic Leukemia
Published on: December 4, 2018
06:38High Sensitivity Measurement of Transcription Factor-DNA Binding Affinities by Competitive Titration Using Fluorescence Microscopy
Published on: February 7, 2019
Videos de Conceptos Relacionados
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...
02:02Cis-regulatory Sequences
Cis-regulatory sequences are short fragments of non-coding DNA that are present on the same chromosomes as the genes that they regulate. These fragments serve as binding sites for transcriptional regulators, proteins that are responsible for controlling gene transcription and differential gene expression across cell types in eukaryotes. Cis-regulatory sequences can be close to the gene of interest or thousands of bases away in the DNA sequence; however, those sequences that are further away are...
02:13Cooperative Binding of Transcription Regulators
Transcriptional regulators bind to specific cis-regulatory sequences in the DNA to regulate gene transcription. These cis-regulatory sequences are very short, usually less than ten nucleotide pairs in length. The short length means that there is a high probability of the exact same sequence randomly occurring throughout the genome. Since regulators can also bind to groups of similar sequences, this further increases the chances of random binding. Transcriptional regulators form dimers that...
02:04Co-activators and Co-repressors
Gene transcription is regulated by the synergistic action of several proteins that form a complex at a gene regulatory site. This is observed in eukaryotes, where the regulation of gene expression is a complex process. Regulatory proteins in eukaryotes can broadly be classified into two types – regulators that bind directly to specific DNA sequences and co-regulators that associate with regulatory proteins but cannot directly bind to the DNA. These co-regulators are further divided into...
02:13Cooperative Binding of Transcription Regulators
Transcriptional regulators bind to specific cis-regulatory sequences in the DNA to regulate gene transcription. These cis-regulatory sequences are very short, usually less than ten nucleotide pairs in length. The short length means that there is a high probability of the exact same sequence randomly occurring throughout the genome. Since regulators can also bind to groups of similar sequences, this further increases the chances of random binding. Transcriptional regulators form dimers that...
01:24Nucleoid
The nucleoid represents a structurally and functionally distinct region within prokaryotic cells, where the cell's DNA and associated proteins are housed. Unlike eukaryotic cells, prokaryotes lack a membrane-bound nucleus, and the nucleoid facilitates the organization and accessibility of the genetic material within this constraint. The DNA in most bacteria and archaea exists as a single, circular, double-stranded molecule that is highly compacted through supercoiling and interactions with...