Video Experimental Relacionado
Updated: Jul 8, 2025
13:16
Characterization of Membrane Transporters by Heterologous Expression in E. coli and Production of Membrane Vesicles
Published on: December 31, 2019
9.3K
Mecanismos de transporte e inhibición de la VMAT2 humana
Di Wu1,2, Qihao Chen2,3, Zhuoya Yu2,3
1Laboratory of Soft Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, China.
Nature
|December 11, 2023
Resumen
Los conocimientos estructurales sobre el transportador de monoaminas vesiculares 2 (VMAT2) revelan cómo es transportado y inhibido por los medicamentos. Esto proporciona una base para el desarrollo de nuevas terapias para trastornos neurológicos y psiquiátricos.
Área de la Ciencia:
- La neurociencia
- Biología estructural
- Farmacología
Sus antecedentes:
- El transportador de monoaminas vesiculares 2 (VMAT2) es crucial para la neurotransmisión monoaminérgica, esencial para el almacenamiento y la liberación de monoaminas.
- La disfunción de VMAT2 está relacionada con afecciones neurológicas y psiquiátricas como la enfermedad de Parkinson, trastornos hipercinéticos y depresión.
- Los medicamentos dirigidos a VMAT2, como la reserpina y la tetrabenazina, se usan para tratar la hipertensión y la enfermedad de Huntington.
Objetivo del estudio:
- Aclarar los mecanismos estructurales del transporte mediado por VMAT2 y la inhibición del fármaco.
- Proporcionar datos estructurales de alta resolución de VMAT2 humano en complejo con sustratos e inhibidores.
- Establecer las bases para el diseño racional de fármacos dirigidos a VMAT2.
Principales métodos:
- Para determinar las estructuras se empleó la crio-microscopía electrónica (crio-EM).
- El VMAT2 humano fue estudiado en complejo con serotonina y tres fármacos clínicos (reserpina, ketanserin, tetrabenazina).
- Las estructuras se resolvieron a alta resolución (3,5-2,8 Å).
Principales resultados:
- El estudio determinó las estructuras de VMAT2 humano en tres estados funcionales distintos.
- Se demostró que la reserpina y la cetanserina se unen al bolsillo de unión al sustrato, estabilizando diferentes conformaciones de VMAT2.
- Se observó que la tetrabenazina se une a un bolsillo único, atrapando VMAT2 en un estado oculto, revelando la base estructural del ciclo de transporte.
Conclusiones:
- Las estructuras determinadas proporcionan una comprensión mecanicista del reconocimiento, transporte e inhibición del sustrato VMAT2.
- Estos hallazgos ofrecen una base estructural para la comprensión de la farmacología de VMAT2.
- El estudio facilita el diseño racional de nuevos agentes terapéuticos dirigidos a VMAT2 para trastornos neurológicos y psiquiátricos.
Más Videos Relacionados
06:18Brain Slice Biotinylation: An Ex Vivo Approach to Measure Region-specific Plasma Membrane Protein Trafficking in Adult Neurons
Published on: April 3, 2014
13.0K
09:12Selection of Transporter-Targeted Inhibitory Nanobodies by Solid-Supported-Membrane SSM-Based Electrophysiology
Published on: May 3, 2021
2.6K
Videos de Conceptos Relacionados
01:14Active Transport
722
Active transport is a critical biological process that allows cells to move solutes against an electrochemical gradient. This process requires direct energy input and is characterized by its selectivity, saturability, and susceptibility to competitive inhibition.
Primary active transporters, like Na+, K+ and -ATPase, directly utilize ATP to move ions across the membrane. These transporters play significant roles in various physiological processes. For instance, Na+, K+ and -ATPase maintain...
Primary active transporters, like Na+, K+ and -ATPase, directly utilize ATP to move ions across the membrane. These transporters play significant roles in various physiological processes. For instance, Na+, K+ and -ATPase maintain...
722
01:06Carrier-Mediated Transport
441
Carrier-mediated transport is a pivotal process in drug absorption, particularly for lipid-insoluble drugs, and encompasses facilitated diffusion and active transport. Facilitated diffusion allows drugs to move along their concentration gradient without energy expenditure, while active transport utilizes ATP to drive drug movement against this gradient.
Active transport involves two types of membrane-spanning transporters: uptake and efflux. Uptake transporters are expressed in the small...
Active transport involves two types of membrane-spanning transporters: uptake and efflux. Uptake transporters are expressed in the small...
441
01:44The Significance of Membrane Transport
26.7K
The transport of solutes across the cell membrane is essential for metabolic processes, like maintaining cell size and volume, generating the action potential, exchanging nutrients and gases, etc. Membrane transport can be either passive or active. It can be simple diffusion, facilitated, or mediated transport aided by transport proteins such as transporters and channels.
Transporters facilitate either an active or passive movement of solutes. They can allow a single-molecule transport down its...
Transporters facilitate either an active or passive movement of solutes. They can allow a single-molecule transport down its...
26.7K
01:32Secondary Active Transport
7.1K
One example of how cells use the energy contained in electrochemical gradients is demonstrated by glucose transport into cells. The ion vital to this process is sodium (Na+), which is typically present in higher concentrations extracellularly than in the cytosol. Such a concentration difference is due, in part, to the action of an enzyme "pump" embedded in the cellular membrane that actively expels Na+ from a cell. Importantly, as this pump contributes to the high concentration of...
7.1K
01:19Drug Absorption Mechanism: Carrier-Mediated Membrane Transport
3.8K
Certain large, lipid-insoluble drug molecules that resemble amino acids, peptides, or glucose, require specialized carrier proteins to facilitate their diffusion across cell membranes. This transport can occur through either facilitated diffusion, which does not require energy input, or active transport, which does require energy input.
Facilitated diffusion is a passive process that utilizes human Solute Carrier (SLC) transporters. These transporters bind to the drug, undergo structural...
Facilitated diffusion is a passive process that utilizes human Solute Carrier (SLC) transporters. These transporters bind to the drug, undergo structural...
3.8K
01:31Membrane Transporters
11.2K
Transporters are essential membrane transport proteins with functions related to cell nutrition, homeostasis, communication, etc. Approximately 7% of all genes in the human genome code for transporters or transporter-related proteins.
Transporters are mainly composed of alpha-helices, built from bundles of ten or more helices traversing the plasma membrane. The solute-binding sites are located midway, where some of the helices are broken or distorted, making space for the binding site through...
Transporters are mainly composed of alpha-helices, built from bundles of ten or more helices traversing the plasma membrane. The solute-binding sites are located midway, where some of the helices are broken or distorted, making space for the binding site through...
11.2K