Video Experimental Relacionado
Updated: Sep 18, 2025
07:40
Whole-Mount Staining, Visualization, and Analysis of Fungiform, Circumvallate, and Palate Taste Buds
Published on: February 11, 2021
3.6K
Caracterización estructural y funcional del receptor del sabor dulce humano
Zongjun Shi1,2, Weixiu Xu1, Lijie Wu1
1iHuman Institute, ShanghaiTech University, Shanghai, China.
Nature
|June 24, 2025
Resumen
Los investigadores mapearon el receptor del sabor dulce humano (TAS1R2 / TAS1R3) utilizando cryo-EM. Las estructuras revelan cómo la sucralosa se une a TAS1R2, explicando la percepción del sabor dulce y guiando el diseño de nuevos edulcorantes.
Área de la Ciencia:
- La bioquímica
- Biología molecular
- Biología estructural
Sus antecedentes:
- La percepción del sabor dulce es crucial para las elecciones dietéticas y la salud metabólica.
- El receptor de sabor dulce humano (TAS1R2/TAS1R3) es un GPCR de clase C que detecta varios compuestos dulces.
- Comprender su estructura es clave para dilucidar su función e impacto metabólico.
Objetivo del estudio:
- Para determinar las estructuras tridimensionales del receptor del sabor dulce humano.
- Aclarar el mecanismo de unión de la sucralosa y el reconocimiento de edulcorantes.
- Para entender la activación del receptor y las vías de transducción de señales.
Principales métodos:
- Microscopía cryoelectrónica (cryo-EM) para obtener estructuras de alta resolución.
- Estudios de mutagenesis para investigar la función de las proteínas.
- Simulaciones de dinámica molecular para analizar las interacciones de los ligandos.
Principales resultados:
- Las estructuras presentadas del receptor de sabor dulce humano de longitud completa en estados apo y sucralosa.
- Reveló una arquitectura heterodimérica asimétrica con unión de sucralosa al dominio de Venus atrapamoscas de TAS1R2.
- Modos de reconocimiento del edulcorante delineados y cambios conformacionales identificados tras la unión del ligando.
Conclusiones:
- El estudio proporciona los primeros conocimientos estructurales sobre el complejo receptor del sabor dulce humano.
- Se identificó un mecanismo de activación único y una base molecular para la unión de edulcorantes.
- Ofrece una base para diseñar nuevos edulcorantes con propiedades personalizadas.
Videos de Conceptos Relacionados
01:24The Physiology of Taste
4.3K
The perception of a salty flavor is facilitated by sodium ions within the oral salivary fluid. Upon consumption of a salty substance, salt crystals disassemble, leading to the liberation of its constituents—Na+ and Cl- ions. These ions subsequently dissolve into the salivary fluid present in the oral cavity. The external environment of the gustatory cells experiences an elevation in Na+ concentration, thereby establishing a potent concentration gradient. This gradient propels the...
4.3K
01:20Taste Buds and Receptors
2.9K
Gustation, or the sense of taste, is intrinsically linked to the anatomical structures located on the tongue. This organ's surface, along with the entirety of the oral cavity, is adorned with stratified squamous epithelium. Evident on the tongue are elevated structures known as papillae (singular = papilla), which house the mechanisms for the transduction of gustatory stimuli. Four distinct types of papillae exist, each identified by their unique morphological attributes: the circumvallate,...
2.9K
01:43Gustation
49.0K
Gustation is a chemical sense that, along with olfaction (smell), contributes to our perception of taste. It starts with the activation of receptors by chemical compounds (tastants) dissolved in the saliva. The saliva and filiform papillae on the tongue distribute the tastants and increase their exposure to the taste receptors.
49.0K
01:21G-Protein Gated Ion Channels
4.9K
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...
4.9K
01:03Olfactory Receptors: Location and Structure
9.7K
The process of olfaction, also known as the sense of smell, is a sophisticated chemical response system. The specialized sensory neurons that facilitate this process, known as olfactory receptor neurons, are situated in an upper segment of the nasal cavity, known as the olfactory epithelium. Olfactory sensory neurons are bipolar, with their dendrites extending from the epithelium's apex into the mucus that lines the nasal cavity. Airborne molecules, when inhaled, traverse the olfactory...
9.7K
01:26Introduction to Special Senses
6.2K
Sensory receptors play an integral part in comprehending our external and internal environments. They receive diverse stimuli, converting them into the nervous system's electrochemical signals. This conversion occurs as the stimulus alters the sensory neuron's cell membrane potential, instigating the generation of an action potential. This action potential is subsequently transmitted to the central nervous system (CNS), which integrates with other sensory data or higher cognitive...
6.2K