Video Experimental Relacionado
Updated: May 26, 2026
08:07
Identification of Inositol Phosphate or Phosphoinositide Interacting Proteins by Affinity Chromatography Coupled to Western Blot or Mass Spectrometry
Published on: July 26, 2019
Estructura de HDAC3 unido al co-represor y el tetrafosfato de inositol
Peter J Watson1, Louise Fairall, Guilherme M Santos
1Henry Wellcome Laboratories of Structural Biology, Department of Biochemistry, University of Leicester, Leicester LE1 9HN, UK.
Nature
|January 11, 2012
Resumen
Las enzimas de la histona desacetilasa (HDAC) son objetivos cruciales para el cáncer. Los investigadores descubrieron que una molécula de inositol tetrafosfato actúa como un pegamento molecular, permitiendo la formación de HDAC3 y el complejo co-represor para la regulación génica.
Área de la Ciencia:
- La bioquímica es la bioquímica.
- Biología Molecular Biología Molecular
- Investigación del cáncer Investigación del cáncer.
Sus antecedentes:
- Las enzimas histona desacetilasa (HDAC) regulan la expresión génica y son objetivos clave de los fármacos contra el cáncer.
- Los HDAC de clase I a menudo requieren complejos co-represores para su actividad enzimática.
- Comprender las interacciones HDAC-co-represor es vital para el desarrollo de terapias dirigidas contra el cáncer.
Objetivo del estudio:
- Para dilucidar las bases estructurales de la formación del complejo HDAC3 humano con el co-represor SMRT.
- Identificar las interacciones moleculares clave que median el ensamblaje del complejo HDAC3-SMRT.
- Explorar el papel de las pequeñas moléculas en la regulación de la actividad HDAC.
Principales métodos:
- Cristalografía de rayos X para determinar la estructura del complejo humano HDAC3-SMRT.
- Ensayos bioquímicos para evaluar la dependencia de la formación de complejos en el tetrafosfato de inositol.
- Análisis estructural para identificar las principales interfaces de unión y las interacciones moleculares.
Principales resultados:
- La estructura revela un cambio conformacional significativo en el dominio de activación de la desacetilasa SMRT (DAD) tras la formación del complejo.
- El D-myo-inositol-{1,4,5,6)-tetracisfosfato (Ins{1,4,5,6) P4) actúa como un puente intermolecular esencial entre el HDAC3 y la SMRT.
- El ensamblaje complejo es críticamente dependiente de Ins{1,4,5,6) P4, lo que sugiere su papel regulador.
Conclusiones:
- Ins ((1,4,5,6) P4 es un mediador crucial para la formación y activación del complejo HDAC3-SMRT.
- Este mecanismo de activación de HDAC por el tetrafosfato de inositol se conserva en todas las especies.
- Los hallazgos abren nuevas vías para estrategias terapéuticas dirigidas a los HDAC en el cáncer.
Videos de Conceptos Relacionados
02:38Heterochromatin
The extent of chromatin compaction can be studied by staining chromatin using specific DNA binding dyes. Under the microscope, the dense-compacted regions that take up more dye are called heterochromatin. Heterochromatin is further classified into two forms – constitutive heterochromatin and facultative heterochromatin.
Constitutive heterochromatin: It is a highly compact region of chromatin that is mostly concentrated in the centromere and telomere. Unlike euchromatin, the amino acid at 9th...
Constitutive heterochromatin: It is a highly compact region of chromatin that is mostly concentrated in the centromere and telomere. Unlike euchromatin, the amino acid at 9th...
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...
02:04Co-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...
02:36Chromatin Immunoprecipitation- ChIP
Chromatin immunoprecipitation, or ChIP, is an antibody-based technique used to identify sites on DNA that bind to transcription factors of interest or histone proteins. It also helps determine the type of histone modifications such as acetylation, phosphorylation, or methylation.
Types of ChIP
ChIP can be divided into two types - X-ChIP and N-ChIP. X-ChIP involves in vivo cross-linking of histones and regulatory proteins to DNA, fragmenting the DNA by sonication, and isolating the protein-DNA...
Types of ChIP
ChIP can be divided into two types - X-ChIP and N-ChIP. X-ChIP involves in vivo cross-linking of histones and regulatory proteins to DNA, fragmenting the DNA by sonication, and isolating the protein-DNA...
01:01Euchromatin
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...
Euchromatin is the less dense region of the chromatin and stains lighter. Euchromatin contains histone H3 extensively...
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...