Video Experimental Relacionado
Updated: Sep 10, 2025
11:49
Characterization of G Protein-coupled Receptors by a Fluorescence-based Calcium Mobilization Assay
Published on: July 28, 2014
40.8K
Bases estructurales del reconocimiento y la modulación de péptidos para los receptores de neuropéptido FF
Xinzhu Li1, Heng Zhang2, Wen Hu3
1School of Pharmaceutical Sciences, Shanghai Jiao Tong University, Shanghai 200240, China; Lingang Laboratory, Shanghai, China.
Cell reports
|August 21, 2025
Resumen
Los conocimientos estructurales sobre los receptores del neuropéptido FF (NPFFR1 y NPFFR2) revelan cómo se unen a los péptidos NPFF y NPVF. Estos hallazgos aclaran la activación y la selectividad de los receptores para el desarrollo de terapias dirigidas.
Área de la Ciencia:
- Biología estructural
- Neurofarmacología
- Investigación GPCR
Sus antecedentes:
- Los receptores del neuropéptido FF (NPFFR1 y NPFFR2) son receptores acoplados a la proteína G involucrados en el dolor, el metabolismo y la tolerancia a los opiáceos.
- Los mecanismos precisos de la selectividad del ligando y la activación del receptor para NPFFR1 y NPFFR2 siguen siendo incompletamente entendidos.
Objetivo del estudio:
- Para aclarar la base estructural del reconocimiento y la activación del ligando para NPFFR1 y NPFFR2.
- Comprender los determinantes moleculares de la selectividad del subtipo entre NPFFR1 y NPFFR2.
- Proporcionar un marco estructural para el desarrollo de moduladores NPFFR selectivos.
Principales métodos:
- Se utilizó microscopía criolectrónica (crio-EM) para determinar las estructuras de NPFFR1 y NPFFR2 unidas a NPFF o NPVF.
- Se realizaron estudios de mutagenesis para identificar los principales residuos de los receptores implicados en la selectividad y activación de los ligandos.
Principales resultados:
- Cuatro estructuras cryo-EM distintas revelaron interacciones RF-amida conservadas en el bolsillo ortostérico y variaciones N-terminales que contribuyen a la especificidad del subtipo.
- El bucle extracelular 2 (ECL2) y el extremo del receptor N fueron identificados como críticos para distinguir entre las interacciones NPVF-NPFFR1 y NPFF-NPFFR2.
- Se observaron distintos mecanismos de acoplamiento de proteínas Gi entre los subtipos de NPFFR, junto con la aclaración del proceso de activación del receptor.
Conclusiones:
- Estos hallazgos estructurales y de mutagénesis proporcionan información molecular crítica sobre el reconocimiento de péptidos de amida de RF y la activación de NPFFR.
- El estudio ofrece una base estructural para diseñar moduladores NPFFR altamente selectivos para atacar el dolor, la adicción y los trastornos metabólicos.
- La comprensión de estos mecanismos puede conducir a terapias con mayor especificidad y menos efectos secundarios.
Videos de Conceptos Relacionados
01:30Transducer Mechanism: G Protein–Coupled Receptors
2.4K
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,...
2.4K
02:43Peptide Bonds
76.6K
A peptide bond covalently attaches amino acids through a dehydration reaction. One amino acid's carboxyl group and another amino acid's amino group combine, releasing a water molecule. The resulting bond is the peptide bond. The products that such linkages form are peptides. As more amino acids join this growing chain, the resulting chain is a polypeptide. Each polypeptide has a free amino group at one end. This end has the N-terminal, or the amino-terminal, and the other end has a free...
76.6K
01:15G Protein-coupled Receptors
13.3K
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...
13.3K
01:49Conserved Binding Sites
4.3K
Many proteins’ biological role depends on their interactions with their ligands, small molecules that bind to specific locations on the protein known as ligand-binding sites. Ligand-binding sites are often conserved among homologous proteins as these sites are critical for protein function.
Binding sites are often located in large pockets, and if their location on a protein’s surface is unknown, it can be predicted using various approaches. The energetic method computationally...
Binding sites are often located in large pockets, and if their location on a protein’s surface is unknown, it can be predicted using various approaches. The energetic method computationally...
4.3K
01:30Regulation of Food Intake
370
Short-term regulation of food intake primarily involves neural signals from the gastrointestinal (GI) tract, blood nutrient levels, and GI tract hormones. Communication between the gut and brain via vagal nerve fibers plays a significant role in evaluating the contents of the gut. Clinical studies have shown that protein ingestion produces a more prolonged response in these nerve fibers compared to an equivalent amount of glucose. Additionally, the activation of stretch receptors caused by GI...
370
01:27Transducer Mechanism: Enzyme-Linked Receptors
2.8K
Enzyme-linked receptors are cell-surface receptors acting as an enzyme or associating with an enzyme intracellularly. They make excellent drug targets. Drugs can bind to the extracellular ligand-binding domain or directly affect their enzymatic domain and alter their activity.
Major types that are helpful drug targets include:
Major types that are helpful drug targets include:
2.8K