Video Experimental Relacionado
Updated: Jan 10, 2026

09:03
Parallel Interrogation of β-Arrestin2 Recruitment for Ligand Screening on a GPCR-Wide Scale using PRESTO-Tango Assay
Published on: March 10, 2020
13.6K
Detención no canónica del reclutamiento de GPR1 dependiente y independiente del agonista
Heng Cai1,2,3,4, Xiaowen Lin1,2,5, Lechen Zhao1,5
1School of Pharmaceutical Science and Technology, Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences, Hangzhou, China.
Resumen
Receptor acoplado a la proteína G GPR1
Área de la Ciencia:
- Biología estructural
- La bioquímica
- Señales celulares
Sus antecedentes:
- Los receptores acoplados a proteínas G (GPCR) exhiben diversas vías de señalización.
- El receptor de quimerina GPR1 muestra una débil señalización de la proteína G pero una internalización mediada por arrestina.
- Los mecanismos y las funciones fisiológicas del patrón de señalización de GPR1 siguen sin estar claros.
Objetivo del estudio:
- Para aclarar la base estructural de la señalización única de GPR1.
- Investigar la interacción de GPR1 con la quimerina y las arrestinas.
- Para entender el papel de GPR1 en el metabolismo de los lípidos.
Principales métodos:
- Cristalografía de rayos X para determinar las estructuras de los complejos GPR1.
- Ensayos bioquímicos para analizar las interacciones receptor-ligando y receptor-arrestina.
- Ensayos celulares para evaluar la función de GPR1 en los adipocitos.
Principales resultados:
- Las estructuras revelan patrones de interacción distintos con la GPR1-arrestina tras la estimulación del agonista.
- La internalización de GPR1 independiente del agonista implica una fosforilación constitutiva y una bolsa de unión de ácidos grasos.
- Estos hallazgos sugieren el papel potencial de GPR1 en la modulación de la acumulación de lípidos.
Conclusiones:
- Los distintos modos de enlace de arresto explican las respuestas celulares diferenciales.
- El GPR1 constitutivamente activo, unido a la arrestina y los ácidos grasos, media la internalización.
- GPR1 puede regular el metabolismo de los lípidos en los adipocitos, ofreciendo objetivos terapéuticos.
Videos de Conceptos Relacionados
GPCR Desensitization
7.9K
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...
7.9K
GPCRs Regulate Adenylyl Cylase Activity
7.3K
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...
7.3K
G-Protein Gated Ion Channels
5.5K
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...
5.5K
Activation and Inactivation of G Proteins
10.7K
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...
10.7K
IP3/DAG Signaling Pathway
14.2K
Membrane lipids such as phosphatidylinositol (PI) are precursors for several membrane-bound and soluble second messengers. Specific kinases phosphorylate PI and produce phosphorylated inositol phospholipids. One such inositol phospholipids are the phosphatidylinositol-4,5 bisphosphate [PI(4,5)P2], present in the inner half of the lipid bilayer. Upon ligand binding, GPCR stimulates Gq proteins to turn on phospholipase Cꞵ. Activated phospholipase Cꞵ cleaves PI(4,5)P2 and...
14.2K
G-protein Coupled Receptors
131.4K
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.
131.4K

