Video Experimental Relacionado

Updated: Jul 28, 2026

G Protein-selective GPCR Conformations Measured Using FRET Sensors in a Live Cell Suspension Fluorometer Assay

G Protein-selective GPCR Conformations Measured Using FRET Sensors in a Live Cell Suspension Fluorometer Assay

Published on: September 10, 2016

La estructura cristalina 2.0 A de una proteína G heterotrimérica tiene una estructura

D G Lambright¹, J Sondek, A Bohm

¹Department of Molecular Biophysics and Biochemistry, Yale University, New Haven, Connecticut 06510, USA.

|January 25, 1996

Resumen

La estructura de las proteínas G heterotriméricas muestra cómo interactúan las subunidades alfa y beta gamma. Este mecanismo dependiente de los nucleótidos controla la señalización de la proteína G al alterar la conformación de la subunidad alfa.

Área de la Ciencia:

Biología Estructural Biología estructural.
Biología Molecular Biología Molecular
La bioquímica es la bioquímica.

Sus antecedentes:

Las proteínas G heterotriméricas son transductores de señales clave.
Su función depende de las interacciones reguladas entre las subunidades alfa y beta gamma.

Objetivo del estudio:

Para dilucidar el mecanismo estructural del compromiso de la subunidad de la proteína G dependiente de los nucleótidos.
Para entender cómo esta interacción regula las vías de señalización.

Principales métodos:

Cristalografía de rayos X con rayos X.
Pruebas bioquímicas de ensayos.
El análisis estructural es el análisis estructural.

Principales resultados:

Estructura detallada del complejo heterotrimérico de proteínas G.
Identificó dos interfaces distintas que rigen la interacción de las subunidades.
Se demostraron cambios conformacionales dependientes de nucleótidos en la subunidad alfa, mientras que las subunidades beta y gamma se mantuvieron en gran medida sin cambios.

Conclusiones:

El estudio revela la base molecular de la activación y regulación de la proteína G.
Proporciona información sobre la orientación de las proteínas G en relación con los receptores y las membranas.
Destaca el papel de los cambios conformacionales en la transducción de señales.

Más Videos Relacionados

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

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

Published on: February 20, 2018

Strategic Screening and Characterization of the Visual GPCR-mini-G Protein Signaling Complex for Successful Crystallization

Strategic Screening and Characterization of the Visual GPCR-mini-G Protein Signaling Complex for Successful Crystallization

Published on: March 16, 2020

Videos de Conceptos Relacionados

G-protein Coupled Receptors

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 Receptors

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 Receptors

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 Proteins

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...

G Protein-coupled Receptors

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...

Transducer Mechanism: G Protein–Coupled Receptors

Transducer Mechanism: G Protein–Coupled Receptors

G Protein–Coupled Receptors (GPCRs) are membrane-bound receptors that transiently associate with heterotrimeric G proteins and induce an appropriate response to various stimuli. GPCRs regulate critical physiological pathways and are excellent drug targets for treating diseases such as diabetes, cancer, obesity, depression, or Alzheimer's. Nearly 35% of approved drugs implement their therapeutic effects by selectively interacting with specific GPCRs.
GPCRs are also called heptahelical, 7TM, or...