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Videos de Conceptos Relacionados

G-protein Coupled Receptors01:21

G-protein Coupled Receptors

G-protein coupled receptors are ligand binding receptors that indirectly affect changes in the cell. The actual receptor is a single polypeptide that transverses the cell membrane seven times creating intracellular and extracellular loops. The extracellular loops create a ligand specific pocket which binds to neurotransmitters or hormones. The intracellular loops holds onto the G-protein.
G-protein Coupled Receptors01:21

G-protein Coupled Receptors

G-protein coupled receptors are ligand binding receptors that indirectly affect changes in the cell. The actual receptor is a single polypeptide that transverses the cell membrane seven times creating intracellular and extracellular loops. The extracellular loops create a ligand specific pocket which binds to neurotransmitters or hormones. The intracellular loops holds onto the G-protein.
G Protein-coupled Receptors01:15

G Protein-coupled Receptors

G Protein-Coupled Receptors or GPCRs are membrane-bound receptors that transiently associate with heterotrimeric G proteins and induce an appropriate response to sensory stimuli such as light, odors, hormones, cytokines, or neurotransmitters.
GPCRs are also called heptahelical, 7TM, or serpentine receptors, and consist of seven (H1-H7) transmembrane alpha-helices that span the bilayer to form a cylindrical core. The transmembrane helices are connected by three extracellular loops and three...
Activation and Inactivation of G Proteins01:22

Activation and Inactivation of G Proteins

Heterotrimeric G proteins are guanine nucleotide-binding proteins. As the name suggests, heterotrimeric G proteins are composed of three subunits: alpha, beta, and gamma. They remain GDP-bound or GTP-bound inside the cells and switch between inactive/active states. The Gα subunit possesses the nucleotide-binding pocket that binds guanine nucleotides and switches between GDP or GTP-bound states. In contrast, the Gꞵ and Gγ subunits are always bound together with high affinity and are together...
GPCR Desensitization01:12

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...
G Protein-coupled Receptors01:15

G Protein-coupled Receptors

G Protein-Coupled Receptors or GPCRs are membrane-bound receptors that transiently associate with heterotrimeric G proteins and induce an appropriate response to sensory stimuli such as light, odors, hormones, cytokines, or neurotransmitters.
GPCRs are also called heptahelical, 7TM, or serpentine receptors, and consist of seven (H1-H7) transmembrane alpha-helices that span the bilayer to form a cylindrical core. The transmembrane helices are connected by three extracellular loops and three...

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Video Experimental Relacionado

Updated: May 11, 2026

A Kinetic Fluorescence-based Ca2+ Mobilization Assay to Identify G Protein-coupled Receptor Agonists, Antagonists, and Allosteric Modulators
07:41

A Kinetic Fluorescence-based Ca2+ Mobilization Assay to Identify G Protein-coupled Receptor Agonists, Antagonists, and Allosteric Modulators

Published on: February 20, 2018

Reestructuración de la activación del receptor acoplado a la proteína G.

Martin Audet1, Michel Bouvier

  • 1Department of Biochemistry, Institute for Research in Immunology and Cancer, Université de Montréal, QC, Canada.

Cell
|October 2, 2012
PubMed
Resumen

Los receptores acoplados a la proteína G (GPCR) son cruciales para la señalización celular. Recientes conocimientos estructurales revelan nuevos mecanismos de unión y activación de ligandos, lo que hace avanzar la investigación de GPCR.

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Last Updated: May 11, 2026

A Kinetic Fluorescence-based Ca2+ Mobilization Assay to Identify G Protein-coupled Receptor Agonists, Antagonists, and Allosteric Modulators
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Área de la Ciencia:

  • La bioquímica es la bioquímica.
  • Biología Molecular Biología Molecular
  • Farmacología Farmacología.

Sus antecedentes:

  • Los receptores acoplados a la proteína G (GPCR) son proteínas vitales de la superficie celular que median la transducción de señales.
  • La caracterización estructural de los GPCR ha sido históricamente difícil, lo que limita los estudios funcionales detallados.
  • La estructura de la rodopsina proporcionó conocimientos tempranos, pero carecía de información más amplia específica de GPCR.

Objetivo del estudio:

  • Revisar los avances recientes en la biología estructural de las GPCR.
  • Para resaltar cómo las nuevas estructuras informan nuestra comprensión de la función de GPCR.
  • Discutir las implicaciones para las futuras direcciones de investigación en GPCRs.

Principales métodos:

  • Análisis de las estructuras recientemente determinadas de los receptores acoplados a la proteína G.
  • Comparación de nuevos datos estructurales con modelos anteriores basados en rodopsina.
  • Integración de los hallazgos estructurales con el conocimiento existente de la señalización GPCR.

Principales resultados:

  • Las nuevas estructuras de GPCR confirman algunas predicciones de los modelos de rodopsina.
  • Se han revelado modos inesperados de unión de ligandos y mecanismos de activación.
  • Los datos estructurales apoyan conceptos emergentes como la dimerización de GPCR y la señalización sesgada.

Conclusiones:

  • El reciente aumento en las estructuras de GPCR mejora significativamente la comprensión de su función.
  • Estas ideas son cruciales para el desarrollo de terapias dirigidas.
  • Los estudios futuros explorarán comportamientos complejos de GPCR como la dimerización y el agonismo sesgado.