Video Experimental Relacionado

Updated: Sep 10, 2025

Preparation and Delivery of Protein Microcrystals in Lipidic Cubic Phase for Serial Femtosecond Crystallography

Preparation and Delivery of Protein Microcrystals in Lipidic Cubic Phase for Serial Femtosecond Crystallography

Published on: September 20, 2016

Estructuras cristalinas del receptor cannabinoide humano ligado al agonista CB1

Tian Hua^1,2,3, Kiran Vemuri^4,5, Spyros P Nikas^4,5

¹iHuman Institute, ShanghaiTech University, Shanghai, China.

|August 27, 2025

Resumen

Las estructuras cristalinas del receptor cannabinoide 1 (CB₁) unido a los agonistas revelan mecanismos de activación clave. Estos hallazgos proporcionan una base molecular para el diseño de nuevas terapias basadas en cannabinoides.

Área de la Ciencia:

Biología estructural
La neurociencia
Farmacología

Sus antecedentes:

El receptor cannabinoide 1 (CB1) es el objetivo principal del Δ9-tetrahidrocannabinol (Δ9-THC), el principal componente psicoactivo de la marihuana.
Comprender la activación del receptor CB1 es crucial para desarrollar terapias dirigidas.

Objetivo del estudio:

Para determinar las estructuras cristalinas de CB1 humano en complejo con ligandos ligados al agonista.
Para aclarar los cambios conformacionales y los mecanismos moleculares subyacentes a la activación del receptor CB1.

Principales métodos:

Cristalografía de rayos X del receptor CB1 humano con agonistas de tetrahidrocannabinol (AM11542) y hexahidrocannabinol (AM841).
Análisis estructural comparativo con estados ligados al antagonista.

Principales resultados:

Se revelaron cambios conformacionales significativos en CB1 tras la unión del agonista, incluyendo una reducción del 53% en el volumen de la bolsa de unión del ligando.
Se identificó un mecanismo de "interruptor doble" que involucra a Phe200 y Trp356, crucial para la activación del receptor.
Se observó un aumento de la superficie en la región de unión a la proteína G.

Conclusiones:

El estudio proporciona información a nivel atómico sobre el mecanismo de activación del receptor CB1.
Estas estructuras ofrecen un marco molecular para predecir la unión de varios cannabinoides.
Los hallazgos guiarán el diseño de nuevos ligandos con perfiles farmacológicos específicos para las afecciones relacionadas con CB1.

Más Videos Relacionados

Harvesting and Cryo-cooling Crystals of Membrane Proteins Grown in Lipidic Mesophases for Structure Determination by Macromolecular Crystallography

Harvesting and Cryo-cooling Crystals of Membrane Proteins Grown in Lipidic Mesophases for Structure Determination by Macromolecular Crystallography

Published on: September 2, 2012

Optimizing the Genetic Incorporation of Chemical Probes into GPCRs for Photo-crosslinking Mapping and Bioorthogonal Chemistry in Live Mammalian Cells

Optimizing the Genetic Incorporation of Chemical Probes into GPCRs for Photo-crosslinking Mapping and Bioorthogonal Chemistry in Live Mammalian Cells

Published on: April 9, 2018

Videos de Conceptos Relacionados

Drug-Receptor Interaction: Agonist

Drug-Receptor Interaction: Agonist

Agonists are drugs that interact with specific receptors in the body to produce a biological response. When an agonist binds to a receptor, it activates or enhances the receptor's function, leading to physiological effects. The interaction between agonist drugs and receptors is crucial for their therapeutic action in various medical treatments.
Agonists can bind to receptors in different ways. Some agonists bind directly to the receptor's active site, mimicking the endogenous...

Opioid Receptors: Overview

Opioid Receptors: Overview

Opioid receptors, including the mu (μ, MOR), delta (δ, DOR), and kappa (κ, KOR) types, belong to the rhodopsin family of G protein-coupled receptors. These receptors are located throughout the central and peripheral nervous systems and in non-neuronal tissues such as macrophages and astrocytes. Opioid receptor ligands can be categorized into agonists or antagonists. Highly selective agonists include [d-Ala2, MePhe4, Gly(ol)5]-enkephalin or DAMGO for MOR, [D-Pen2,...

The Two-State Receptor Model

The Two-State Receptor Model

The two-state receptor model explains a drug's interaction with receptors, such as G protein-coupled receptors and ligand-gated ion channels, to induce or inhibit a biological response. When no natural ligands are present, a receptor exists in an equilibrium of inactive (Ri) and active (Ra) conformations. The inactive form does not produce a response, while the active form generates a basal effect known as constitutive activity.
The binding affinity of a drug determines its interaction with...

Adrenergic Agonists: Chemistry and Structure-Activity Relationship

Adrenergic Agonists: Chemistry and Structure-Activity Relationship

Adrenergic agonists' structure-activity relationship (SAR) determines their selectivity and efficacy. These agonists comprise a phenylethylamine moiety with an aromatic ring and an ethylamine side chain.
Aromatic ring substitutions: Substituting the aromatic ring with –OH groups at positions 3 and 4 yields catecholamines (e.g., epinephrine), which have a high affinity for adrenoceptors. Hydrogen bonding between –OH groups and receptors enhances adrenergic activity.
Separation of...

Drug-Receptor Interactions

Drug-Receptor Interactions

Drug-receptor interaction describes the binding of receptors by drugs, but not all drug-receptor interactions result in activation and tissue response. For instance, the binding of agonists activates the receptor to generate a cellular reaction, while antagonists bind to receptors without causing their activation.
Several parameters, such as the drug's affinity for its receptor and its efficacy, which is its ability to activate the receptor, determine the drug's effect on the tissue....

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...