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Videos de Conceptos Relacionados

Transcription Factors02:16

Transcription Factors

Tissue-specific transcription factors contribute to diverse cellular functions in mammals. For example, the gene for beta globin, a major component of hemoglobin, is present in all cells of the body. However, it is only expressed in red blood cells because the transcription factors that can bind to the promoter sequences of the beta globin gene are only expressed in these cells. Tissue-specific transcription factors also ensure that mutations in these factors may impair only the function of...
Transcription Factors02:16

Transcription Factors

Tissue-specific transcription factors contribute to diverse cellular functions in mammals. For example, the gene for beta globin, a major component of hemoglobin, is present in all cells of the body. However, it is only expressed in red blood cells because the transcription factors that can bind to the promoter sequences of the beta globin gene are only expressed in these cells. Tissue-specific transcription factors also ensure that mutations in these factors may impair only the function of...
RNA Polymerase II Accessory Proteins02:36

RNA Polymerase II Accessory Proteins

Proteins that regulate transcription can do so either via direct contact with RNA Polymerase or through indirect interactions facilitated by adaptors, mediators, histone-modifying proteins, and nucleosome remodelers. Direct interactions to activate transcription is seen in bacteria as well as in some eukaryotic genes. In these cases, upstream activation sequences are adjacent to the promoters, and the activator proteins interact directly with the transcriptional machinery. For example, in...
Combinatorial Gene Control02:33

Combinatorial Gene Control

Combinatorial gene control is the synergistic action of several transcriptional factors to regulate the expression of a single gene. The absence of one or more of these factors may lead to a significant difference in the level of gene expression or repression.
The expression of more than 30,000 genes is controlled by approximately 2000-3000 transcription factors. This is possible because a single transcription factor can recognize more than one regulatory sequence. The specificity in gene...
General Transcription Factors01:30

General Transcription Factors

Tissue-specific transcription factors contribute to diverse cellular functions in mammals. For example, the gene for beta globin, a major component of hemoglobin, is present in all cells of the body. However, it is only expressed in red blood cells because the transcription factors that can bind to the promoter sequences of the beta globin gene are only expressed in these cells. Tissue-specific transcription factors also ensure that mutations in these factors may impair only the function of...
TGF - β Signaling Pathway01:16

TGF - β Signaling Pathway

The TGF-β signaling pathway regulates cell growth, differentiation, adhesion, motility, and development. TGF-β ligands that induce TGF-β signaling are synthesized in their latent form. Several proteases or cell surface receptors such as integrins act upon the latent form, releasing the active ligand. There are three types of mammalian TGF-βs: (TGF-β1, TGF-β2, and TGF-β3) that bind as homodimers or heterodimers to TGF-β receptors. The TGF-β receptors are of three kinds RI, RII, and RIII. The RI...

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Video Experimental Relacionado

Updated: May 13, 2026

Rapid Synthesis and Screening of Chemically Activated Transcription Factors with GFP-based Reporters
09:22

Rapid Synthesis and Screening of Chemically Activated Transcription Factors with GFP-based Reporters

Published on: November 27, 2013

Análisis funcional de un complejo de factor de transcripción sensible al factor de crecimiento.

C S Hill1, R Marais, S John

  • 1Transcription Laboratory, Imperial Cancer Research Fund, London, England.

Cell
|April 23, 1993
PubMed
Resumen

La interacción entre el factor de respuesta sérica (SRF) y la proteína Elk-1 es crucial para la regulación génica. Las proteínas SRF y Elk-1 modificadas restauran la función de un promotor gen mutado, lo que demuestra su papel cooperativo en la transcripción.

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Last Updated: May 13, 2026

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Área de la Ciencia:

  • Biología Molecular Biología Molecular
  • Regulación genética Reglamento genético.
  • Interacciones proteína-proteína Las interacciones proteína-proteína.

Sus antecedentes:

  • El factor de respuesta sérica (SRF) es un factor de transcripción que se une al elemento de respuesta sérica c-fos (SRE).
  • SRF colabora con un factor accesorio, Elk-1, para formar un complejo ternario en el SRE.
  • Se está investigando la cooperación funcional precisa entre SRF y Elk-1 en la regulación transcripcional.

Objetivo del estudio:

  • Investigar la cooperación funcional entre SRF y Elk-1 en la regulación de la transcripción.
  • Determinar el papel de los dominios y modificaciones de proteínas específicas en la formación y actividad del complejo SRF-Elk-1.
  • Demostrar que los derivados de especificidad de unión alterada de SRF y Elk-1 pueden restaurar la actividad de un SRE mutado.

Principales métodos:

  • Construcción de derivados de especificidad de unión alterada de SRF y Elk-1.
  • Transfección de células con derivados de SRF y Elk-1 para evaluar la actividad en un SRE. mutado.
  • Análisis de la activación transcripcional dependiente de la fosforilación de Elk-1 y secuencias específicas de SRF.

Principales resultados:

  • Los derivados diseñados de SRF y Elk-1 formaron un complejo ternario en un SRE. mutado e inactivo.
  • La expresión simultánea de estos derivados restauró la actividad regulada por el suero al SRE. mutado.
  • La activación de la transcripción dependía de la fosforilación de Elk-1 y de dominios específicos de SRF involucrados en la formación del complejo ternario.

Conclusiones:

  • SRF y Elk-1 cooperan funcionalmente dentro de un complejo ternario en el SRE para regular la transcripción génica.
  • Los dominios específicos dentro de SRF y el estado de fosforilación de Elk-1 son críticos para esta activación transcripcional cooperativa.
  • Estos hallazgos proporcionan evidencia directa de la sinergia funcional entre SRF y Elk-1.