Video Experimental Relacionado
Updated: Dec 17, 2025
07:51
Inhibitory Synapse Formation in a Co-culture Model Incorporating GABAergic Medium Spiny Neurons and HEK293 Cells Stably Expressing GABAA Receptors
Published on: November 14, 2014
17.7K
Estructuras del receptor metabotrópico GABAB
Makaía M Papasergi-Scott1,2, Michael J Robertson1,2, Alpay B Seven1,2
1Department of Molecular and Cellular Physiology, Stanford University School of Medicine, Stanford, CA, USA.
Nature
|June 25, 2020
Resumen
El receptor metabotrópico del ácido γ-aminobutírico (GABA) B
Área de la Ciencia:
- La neurociencia
- Biología molecular
- Biología estructural
Sus antecedentes:
- Los receptores GABA B metabotrópicos son cruciales para la inhibición prolongada de la neurotransmisión en el cerebro.
- Los receptores GABA B son heterodímeros obligados únicos dentro de la familia C de receptores acoplados a la proteína G.
- Comprender la estructura del receptor GABA B es clave para descifrar sus mecanismos de señalización.
Objetivo del estudio:
- Para aclarar la base estructural de la función del receptor GABA B utilizando la criomicroscopia electrónica.
- Investigar el papel del bucle extracelular 2 (ECL2) en la transducción de la señal del receptor GABA B.
- Proporcionar ideas para el diseño racional de fármacos dirigidos a los receptores GABA B.
Principales métodos:
- Microscopía cryoelectrónica (cryo-EM) para determinar las estructuras completas de los receptores de GABA B.
- Pruebas de señalización celular para evaluar la actividad del receptor.
- Simulaciones atómicas para analizar las interacciones moleculares.
Principales resultados:
- Se obtuvieron estructuras cryo-EM de receptores GABA B heterodiméricos y homodiméricos.
- El bucle extracelular 2 (ECL2) juega un papel crítico en la transmisión de cambios estructurales desde la unión del ligando al núcleo de acoplamiento de la proteína G.
- ECL2 interactúa con los fosfolípidos dentro del dominio transmembrana, vinculando la unión del ligando a la activación de la proteína G.
Conclusiones:
- El estudio proporciona un marco estructural para la comprensión de la transducción de señales del receptor GABA B.
- Los hallazgos ponen de relieve el papel esencial de las interacciones de ECL2 y fosfolípidos en la función del receptor GABA B.
- Estas ideas son vitales para el desarrollo de terapias dirigidas para trastornos neurológicos.
Más Videos Relacionados
Videos de Conceptos Relacionados
01:15G Protein-coupled Receptors
15.9K
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...
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...
15.9K
01:22Activation and Inactivation of G Proteins
10.2K
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...
10.2K
01:30Ligand-Gated Ion Channel Receptor: Gating Mechanism
3.5K
Ligand-gated ion channels are transmembrane proteins that play a vital role in intercellular communication and functions of the nervous system. They allow the influx of ions across the membrane once the neurotransmitter binds, allowing the subsequent transmission of electrical excitation across the neurons. Other ligand-gated ion channels, like the γ-aminobutyric acid (GABA) receptor, permit anions like chloride into the cells on the binding of the GABA molecule. Their entry into the cell...
3.5K
01:30Transducer Mechanism: G Protein–Coupled Receptors
3.6K
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,...
GPCRs are also called heptahelical,...
3.6K
01:21G-protein Coupled Receptors
130.9K
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.
130.9K
01:21G-Protein Gated Ion Channels
5.4K
GPCRs are primarily responsible for our sense of smell, taste, and vision. The binding of a sensory stimulus activates GPCR to stimulate effector proteins, many of which are ion channels in the sensory organs. GPCRs modulate the opening and closing of the target ion channels either directly by binding them, or by releasing second messengers that activate these channels. As ions move across the membrane, the membrane potential is altered, which induces an appropriate response.
Sensory...
Sensory...
5.4K