Video Experimental Relacionado

Updated: Apr 26, 2026

Analyzing DNA-Protein Interactions with Streptavidin-Based Biolayer Interferometry

Analyzing DNA-Protein Interactions with Streptavidin-Based Biolayer Interferometry

Published on: January 17, 2025

Redefiniendo el dominio de unión al ADN del XPA humano

Norie Sugitani¹, Steven M Shell, Sarah E Soss

¹Departments of Biochemistry and Chemistry, and Center for Structural Biology, Vanderbilt University , Nashville, Tennessee 37232-8725, United States.

Journal of the American Chemical Society

|July 25, 2014

Resumen

Se redefinió el dominio de unión al ADN (DBD) del grupo de complementación A (XPA) de Xeroderma pigmentosum. Una nueva construcción de XPA ((98-239) se une al ADN con afinidad proteica de longitud completa, lo que ayuda a los estudios de reparación del ADN.

Área de la Ciencia:

Biología Molecular Biología Molecular
Genética La genética.
La bioquímica es la bioquímica.

Sus antecedentes:

La proteína del grupo de complementación A (XPA) de Xeroderma pigmentosum es crucial para la reparación del ADN a través de la reparación por escisión de nucleótidos (NER).
El XPA actúa como un andamio, interactuando con las proteínas NER y el ADN.
Las mutaciones en el dominio de unión al ADN de XPA (DBD) están vinculadas a fenotipos graves de Xeroderma pigmentosum.

Objetivo del estudio:

Para caracterizar las propiedades de unión al ADN del XPA DBD.
Para investigar la base molecular de las interacciones XPA-ADN.
Identificar una construcción XPA adecuada para el estudio de la unión al ADN.

Principales métodos:

Pruebas de unión al ADN por anisotropía de fluorescencia. ensayos de unión al ADN.
Análisis de la secuencia de XPA.
Generación y análisis de las construcciones XPA del terminal C (XPA98-239).
Espectroscopía de RMN bidimensional (15) N-(1) H. Espectroscopía de RMN bidimensional (15) N-(1) H. Espectroscopía de RMN bidimensional. Espectroscopía de RMN bidimensional. Espectroscopía de RMN bidimensional.

Principales resultados:

El DBD XPA previamente definido (XPA98-219) exhibe una débil afinidad de unión al ADN.
Una construcción redefinida de XPA, XPA98-239, muestra una afinidad de unión al ADN comparable a la de XPA. de longitud completa.
XPA ((98-239) se une a las uniones de ssDNA-dsDNA en forma de Y y a otros sustratos de ADN.
Los datos de RMN sugieren que XPA ((98-239) sufre cambios conformacionales al unirse al ADN.

Conclusiones:

El DBD XPA debe redefinirse para incluir los residuos C-terminales.
XPA ((98-239) es un modelo más preciso para estudiar la actividad de unión al ADN de XPA.
Este hallazgo avanza en la comprensión de los mecanismos de reparación del ADN y de Xeroderma pigmentosum.

Más Videos Relacionados

CD Spectroscopy to Study DNA-Protein Interactions

CD Spectroscopy to Study DNA-Protein Interactions

Published on: February 10, 2022

Atomic Force Microscopy Investigations of DNA Lesion Recognition in Nucleotide Excision Repair

Atomic Force Microscopy Investigations of DNA Lesion Recognition in Nucleotide Excision Repair

Published on: May 24, 2017

Videos de Conceptos Relacionados

Conserved Binding Sites

Conserved 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...

Conservation of Protein Domains Over Different Proteins

Conservation 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...

Inheritance of Chromatin Structures

Inheritance of Chromatin Structures

Epigenetics is the study of inherited changes in a cell's phenotype without changing the DNA sequences. It provides a form of memory for the differential gene expression pattern to maintain cell lineage, position-effect variegation, dosage compensation, and maintenance of chromatin structures such as telomeres and centromeres. For example, the structure and location of the centromere on chromosomes are epigenetically inherited. Its functionality is not dictated or ensured by the underlying...

Single-Strand DNA Binding Proteins

Single-Strand DNA Binding Proteins

For successful DNA replication, the unwinding of double-stranded DNA must be accompanied by stabilization and protection of the separated single strands of the DNA. This crucial task is performed by single-strand DNA-binding (SSB) proteins. They bind to the DNA in a sequence-independent manner, which means that the nitrogenous bases of the DNA need not be present in a specific order for binding of SSB proteins to it. The binding of SSB proteins straightens single-stranded DNA (ssDNA) and makes...

Gene Families

Gene Families

Gene families consist of groups of genes proposed to have originated from a common ancestor. Typically these arise through events in which a gene or genes are mistakenly duplicated during cell division. Unlike their parent genes (which are subject to selection pressure to maintain function), these gene copies do not need to preserve their sequences and may evolve at a relatively faster rate.
Occasionally these regions can be adapted to take on new roles within the organism, becoming novel genes...

Euchromatin

Euchromatin

The extent of chromatin compaction can be studied by staining chromatin using specific DNA binding dyes. Under the microscope, the dense-compacted regions take up more dye, appearing darker, while the less-compact areas take up less dye and appear lighter. Based on the compaction level, chromatins are classified into two primary forms – euchromatin and heterochromatin.
Euchromatin is the less dense region of the chromatin and stains lighter. Euchromatin contains histone H3 extensively...