Video Experimental Relacionado
Updated: Jul 7, 2025
10:08
Study of the Functions and Activities of Neuronal K-Cl Co-Transporter KCC2 Using Western Blotting
Published on: December 9, 2022
2.2K
Cation Cloride Cotransporter NKCC1 Funciona a través de un mecanismo de movimiento en mano
Manuel José Ruiz Munevar1, Valerio Rizzi2, Corinne Portioli3,4
1Laboratory of Molecular Modelling & Drug Discovery, Istituto Italiano di Tecnologia, Via Morego 30, Genoa 16163, Italy.
Journal of the American Chemical Society
|December 26, 2023
Resumen
El cotransportador de sodio, potasio y cloruro 1 (NKCC1) sufre cambios conformacionales cruciales para su función. Estas dinámicas, que involucran hélices transmembranales específicas, regulan el transporte de iones y agua, ofreciendo nuevos objetivos terapéuticos para trastornos neurológicos y cánceres.
Área de la Ciencia:
- La biofísica
- Biología molecular
- Farmacología
Sus antecedentes:
- El cotransportador de sodio, potasio y cloruro 1 (NKCC1) es vital para el transporte de iones a través de las membranas celulares.
- La actividad anormal de NKCC1 está implicada en trastornos neurológicos y cánceres, por lo que es un objetivo terapéutico clave.
Objetivo del estudio:
- Elucidar los movimientos dinámicos conformacionales de NKCC1 esenciales para su función de transporte.
- Comprender el papel de NKCC1 en la permeabilidad de iones y agua para una posible modulación terapéutica.
Principales métodos:
- Simulaciones atómicas guiadas por aprendizaje profundo de NKCC1 incrustadas en una membrana.
- Análisis de las transiciones conformacionales y los estados de permeabilidad al agua.
- Experimentos de mutagenesis para validar los residuos funcionales identificados.
Principales resultados:
- Se identificó un mecanismo de balanceo que involucra a TM4, TM9 y TM10 en los cambios conformacionales de NKCC1.
- Se ha demostrado que NKCC1 posee estados de permeabilidad al agua a través de transiciones conformacionales específicas.
- Se descubrieron contactos interhelical críticos entre TM10 y TM6, validados funcionalmente por mutagénesis.
Conclusiones:
- La función de NKCC1 está modulada por movimientos conformacionales específicos, en particular el mecanismo de balanceo.
- Los residuos conservados identificados en TM10 y TM6 son críticos para el transporte de iones y agua de NKCC1.
- Estos hallazgos allanan el camino para nuevas estrategias terapéuticas dirigidas a NKCC1 y a los cotransportadores relacionados.
Videos de Conceptos Relacionados
01:55Secondary Active Transport
120.2K
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...
120.2K
01:29Primary Active Transport
10.3K
In contrast to passive transport, active transport involves a substance being moved through membranes in a direction against its concentration or electrochemical gradient. There are two types of active transport: primary active transport and secondary active transport. Primary active transport utilizes chemical energy from ATP to drive protein pumps embedded in the cell membrane. With energy from ATP, the pumps transport ions against their electrochemical gradients—a direction they would...
10.3K
01:14Active Transport
720
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...
720
01:19Ion Channels
87.0K
The movement of ions like sodium, potassium, and calcium into and out of the cell is essential to maintain the electrochemical gradient in living cells. The ion channels—a class of membrane transport proteins—help maintain this ionic gradient for the smooth functioning of physiological activities such as maintaining cell size and volume, conducting nerve impulses, and gas and nutrient exchange.
Ion channels are specialized integral membrane proteins on the plasma membrane that allow...
Ion channels are specialized integral membrane proteins on the plasma membrane that allow...
87.0K
01:12Clathrin Coated Vesicles
7.0K
Clathrin-coated vesicles use endocytosis to transport receptors and lysosomal hydrolases from the Golgi to the lysosome in the late secretory pathway. Clathrin-mediated endocytosis was the first described endocytic process, and Clathrin-coated vesicles remain one of the most well-studied transport vesicles. The molecular machinery that generates clathrin-coated vesicles comprises over 50 proteins that precisely coordinate vesicle formation. Cell surface receptors concentrated in indented sites...
7.0K
01:26Transport Across the Golgi
4.2K
While it is unclear how molecules move between adjacent Golgi cisternae, it is apparent that the molecules move from cis- cisterna, the entry face, to the trans- cisterna, the exit face. Experiments initially suggested vesicles that bud from one cisterna and fuse with the next cisterna to transport proteins between the cisternae. This vesicular transport model describes the Golgi apparatus as a relatively static structure with a unique enzyme composition in each cisterna. Molecules are...
4.2K