Video Experimental Relacionado
Updated: Jul 19, 2026
06:45
Transmembrane Domain Oligomerization Propensity determined by ToxR Assay
Published on: May 26, 2011
Caracterización de un cofactor que regula la dimerización de una proteína del homeodomain de los mamíferos
D B Mendel1, P A Khavari, P B Conley
1Howard Hughes Medical Institute, Stanford University, CA 94305.
Science (New York, N.Y.)
|December 20, 1991
Resumen
Los factores de transcripción como el factor nuclear hepatocitario-1 alfa (HNF-1 alfa) regulan la expresión génica a través de la dimerización. Un cofactor, DCoH, estabiliza los dímeros alfa HNF-1, formando complejos tetrámeros que mejoran la actividad transcripcional.
Área de la Ciencia:
- Biología Molecular Biología Molecular
- Regulación genética Reglamento genético.
- Interacciones de las proteínas.
Sus antecedentes:
- La dimerización es crucial para la función del factor de transcripción en los eucariotas.
- El factor nuclear hepatocitario-1 alfa (HNF-1 alfa) es un factor de transcripción clave que se dimeriza para regular la expresión génica.
- Comprender estas interacciones es vital para descifrar las redes reguladoras de genes.
Objetivo del estudio:
- Investigar el papel de un nuevo cofactor de dimerización (DCoH) en la función alfa del HNF-1.
- Para dilucidar el mecanismo por el cual DCoH influye en la actividad transcripcional de HNF-1 alfa.
- Para determinar la contribución específica del tejido de DCoH a la regulación génica.
Principales métodos:
- Identificación y caracterización del cofactor de dimerización del HNF-1 alfa (DCoH).
- Análisis del efecto del DCoH en la dimerización alfa del HNF-1 y la unión al ADN.
- Evaluación de los cambios mediados por DCoH en la actividad transcripcional del HNF-1 alfa in vitro.
Principales resultados:
- El DCoH estabiliza selectivamente los dímeros alfa del HNF-1, formando un complejo tetramérico.
- Esta formación del complejo tetramérico requiere el dominio de dimerización alfa HNF-1.
- El DCoH mejora la actividad transcripcional del HNF-1 alfa sin alterar su afinidad de unión al ADN.
- El DCoH no confiere activación transcripcional a dominios de unión al ADN no relacionados.
Conclusiones:
- El DCoH actúa como un regulador crítico de los complejos alfa HNF-1 transcripcionalmente activos.
- La formación de tetrámeros alfa DCoH-HNF-1 es esencial para mejorar la salida transcripcional.
- La distribución tisular restringida de DCoH sugiere un papel en la especificidad del desarrollo de la expresión génica.
Más Videos Relacionados
14:47Identification of MyoD Interactome Using Tandem Affinity Purification Coupled to Mass Spectrometry
Published on: May 17, 2016
07:03Pulldown Assay Coupled with Co-Expression in Bacteria Cells as a Time-Efficient Tool for Testing Challenging Protein-Protein Interactions
Published on: December 23, 2022
Videos de Conceptos Relacionados
01:58Cooperative Allosteric Transitions
Cooperative allosteric transitions can occur in multimeric proteins, where each subunit of the protein has its own ligand-binding site. When a ligand binds to any of these subunits, it triggers a conformational change that affects the binding sites in the other subunits; this can change the affinity of the other sites for their respective ligands. The ability of the protein to change the shape of its binding site is attributed to the presence of a mix of flexible and stable segments in the...
02:04Covalently Linked Protein Regulators
Proteins can undergo many types of post-translational modifications, often in response to changes in their environment. These modifications play an important role in the function and stability of these proteins. Covalently linked molecules include functional groups, such as methyl, acetyl, and phosphate groups, and also small proteins, such as ubiquitin. There are around 200 different types of covalent regulators that have been identified.
These groups modify specific amino acids in a protein.
These groups modify specific amino acids in a protein.
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...
02:04Covalently Linked Protein Regulators
Proteins can undergo many types of post-translational modifications, often in response to changes in their environment. These modifications play an important role in the function and stability of these proteins. Covalently linked molecules include functional groups, such as methyl, acetyl, and phosphate groups, and also small proteins, such as ubiquitin. There are around 200 different types of covalent regulators that have been identified.
These groups modify specific amino acids in a protein.
These groups modify specific amino acids in a protein.
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...