Video Experimental Relacionado
Updated: May 21, 2026

11:07
Biochemical Reconstitution of Steroid Receptor•Hsp90 Protein Complexes and Reactivation of Ligand Binding
Published on: September 21, 2011
Una función de inactivación móvil y regulable dentro del dominio de unión de esteroides del receptor de
D Picard1, S J Salser, K R Yamamoto
1Department of Biochemistry and Biophysics, University of California, San Francisco 94143-0448.
Cell
|September 23, 1988
Resumen
La unión hormonal controla el receptor de los glucocorticoides.
Área de la Ciencia:
- Biología molecular La biología molecular.
- Endocrinología Endocrinología.
- Regulación genética La regulación genética.
Sus antecedentes:
- El receptor glucocorticoide (GR) actúa como un transductor de señales.
- La localización nuclear de GR depende de la unión a las hormonas.
Objetivo del estudio:
- Investigar la regulación directa de las funciones de unión y transcripción del ADN de GR por las hormonas.
- Para explorar el papel del dominio de unión de esteroides en la regulación hormonal.
Principales métodos:
- Construcción de los receptores recombinantes.
- Análisis de la actividad de unión y transcripción del ADN.
- Fusión del dominio de unión del esteroide a una proteína no relacionada.
Principales resultados:
- Las funciones de unión y transcripción del ADN de GR están reguladas directamente por las hormonas.
- La regulación hormonal se mantiene incluso cuando el dominio de unión al esteroide se reposiciona.
- La fusión del dominio de unión de esteroides con el adenovirus E1A confiere la regulación hormonal.
Conclusiones:
- El dominio de unión de esteroides regula directamente la función de GR independientemente de su posición.
- La unión hormonal es un regulador clave de la actividad transcripcional de GR.
- La proteína de choque térmico hsp90 puede mediar el efecto inhibidor del dominio de unión de esteroides no ligados.
Videos de Conceptos Relacionados
Co-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...
Eukaryotic Transcription Inhibitors
Certain biochemical processes, such as embryonic development and cell growth regulation, depend on the repression of specific genes. DNA binding proteins known as eukaryotic transcription inhibitors regulate the repression of gene expression in eukaryotes. The presence of these inhibitors at the required location and time in the cell is triggered by the presence of hormones and additional signals from other cells.
Eukaryotic transcription inhibitors usually contain two distinct domains, a DNA...
Eukaryotic transcription inhibitors usually contain two distinct domains, a DNA...
Co-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...
GPCR Desensitization
G protein-coupled receptor (GPCR) signaling plays a crucial role in cell functioning. GPCR desensitization is an equally essential process. It allows cells to respond to changing environments and regain sensitivity to new stimuli while preventing unnecessary stimulation when no longer needed. Prolonged exposure to stimuli leads to GPCR desensitization. It involves blocking the receptors from binding and activating additional G proteins. This inhibits activation of downstream effectors, thereby...
GPCRs Regulate Adenylyl Cylase Activity
Some GPCRs transmit signals through adenylyl cyclase (AC), a transmembrane enzyme. AC helps synthesize second messenger cyclic adenosine monophosphate (cAMP). AC catalyzes cyclization reaction and converts ATP to cAMP by releasing a pyrophosphate. The pyrophosphate is further hydrolyzed to phosphate by the enzyme pyrophosphatase, which drives cAMP synthesis to completion. However, cAMP is rapidly degraded to 5′ AMP by the enzymes phosphodiesterase (PDE), preventing overstimulation of cells.
Two...
Two...
Transducer Mechanism: Nuclear Receptors
Nuclear receptors, or NRs, are unique transcription factors that regulate gene transcription and affect the cellular pathways involved in reproduction, development, or metabolism. Their ability to be stimulated by small lipophilic ligands and control vital cellular processes makes them ideal drug targets. Nearly 10-15% of currently prescribed drugs target these receptors.
About 48 different soluble family members of nuclear receptors are identified that can be divided into two main classes:
About 48 different soluble family members of nuclear receptors are identified that can be divided into two main classes:

