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Videos de Conceptos Relacionados

Phosphoinositides and PIPs01:42

Phosphoinositides and PIPs

Phosphoinositides are a group of phospholipids containing a glycerol backbone with two fatty acid chains and a phosphate attached to a myoinositol sugar ring. The inositol head group extends into the cytoplasm, where it is modified by adding phosphate groups to form phosphatidylinositol phosphates or PIPs.
Different phosphoinositides are synthesized and recruited on the cytosolic face of the plasma membrane. The localization of specific phosphoinositides concentrated in separate membrane...
IP3/DAG Signaling Pathway01:11

IP3/DAG Signaling Pathway

Membrane lipids such as phosphatidylinositol (PI) are precursors for several membrane-bound and soluble second messengers. Specific kinases phosphorylate PI and produce phosphorylated inositol phospholipids. One such inositol phospholipids are the  phosphatidylinositol-4,5 bisphosphate [PI(4,5)P2], present in the inner half of the lipid bilayer. Upon ligand binding, GPCR stimulates Gq proteins to turn on phospholipase Cꞵ. Activated phospholipase Cꞵ cleaves PI(4,5)P2 and produces two-second...
What are Second Messengers?01:12

What are Second Messengers?

Because many receptor binding ligands are hydrophilic, they do not cross the cell membrane and thus their message must be relayed to a second messenger on the inside. There are several second messenger pathways, each with their own way of relaying information. G-protein coupled receptors can activate both phosphoinositol and cyclic AMP (cAMP) second messenger pathways. The phosphoinositol path is active when the receptor induces phospholipase C to hydrolyze the phospholipid,...
Non-gated Ion Channels01:24

Non-gated Ion Channels

Ion channels are specialized proteins on the plasma membrane that allow charged ions to pass down their electrochemical gradient. Their main function is to maintain the membrane potential which is critical for cell viability. These channels are either gated or non-gated and can transport more than a thousand ions within milliseconds for the cellular event to occur.
Compared to the gated ion channels, the non-gated channels, also known as leakage or passive channels, have no gating mechanism.
Non-gated Ion Channels01:24

Non-gated Ion Channels

Ion channels are specialized proteins on the plasma membrane that allow charged ions to pass down their electrochemical gradient. Their main function is to maintain the membrane potential which is critical for cell viability. These channels are either gated or non-gated and can transport more than a thousand ions within milliseconds for the cellular event to occur.
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Ion Channels01:19

Ion Channels

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 specific...

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Inner Mitochondrial Membrane Sensitivity to Na+ Reveals Partially Segmented Functional CoQ Pools
05:27

Inner Mitochondrial Membrane Sensitivity to Na+ Reveals Partially Segmented Functional CoQ Pools

Published on: July 20, 2022

Los iones de sodio se internalizan dentro de las membranas fosfolípidas.

Fredric M Menger1, Ashley L Galloway, Mary E Chlebowski

  • 1Department of Chemistry, Emory University, Atlanta, GA 30322, USA.

Journal of the American Chemical Society
|October 26, 2006
PubMed
Resumen

Los fosfolípidos modificados con grupos éster mejoran significativamente la transferencia de iones de sodio a través de las membranas. Los segmentos de cadena corta más allá de los grupos de éster son clave, con tasas de transferencia que aumentan con el tiempo debido a la formación de dominios.

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Área de la Ciencia:

  • Biofísica de las membranas Biofísica de las membranas.
  • Química supramolecular de las moléculas.
  • Ciencia de los materiales Ciencia de los materiales.

Sus antecedentes:

  • Los fosfolípidos forman la base estructural de las membranas biológicas.
  • El control del transporte de iones a través de las bicapas lipídicas es crucial para la función celular y la administración de fármacos.
  • Los fosfolípidos convencionales como el POPC exhiben una permeabilidad iónica limitada.

Objetivo del estudio:

  • Para sintetizar nuevos fosfolípidos modificados por ésteres.
  • Para investigar su eficacia en la promoción del flujo de iones de sodio (Na+) a través de las membranas vesiculares.
  • Para dilucidar el mecanismo de transporte de iones mejorado.

Principales métodos:

  • Síntesis de siete fosfolípidos modificados por éster.
  • Preparación y caracterización de las vesículas.
  • 23Na Espectroscopia de Resonancia Magnética Nuclear (RMN) para cuantificar el flujo de iones de sodio.

Principales resultados:

  • Los fosfolípidos con segmentos de cadena corta más allá de los grupos de ésteres terminales catalizaron la transferencia de Na+ hasta 100 veces en comparación con el POPC.
  • Las tasas de transferencia de iones de sodio aumentaron con la concentración de éster-fosfolípidos en la bicapa.
  • Las tasas también aumentaron con el tiempo de envejecimiento de las vesículas, atribuido a la formación de dominios.

Conclusiones:

  • Los fosfolípidos modificados por éster, particularmente aquellos con cadenas terminales cortas, son potentes catalizadores para el transporte de iones de sodio.
  • La formación de dominios de membrana por estos fosfolípidos facilita la solubilización de iones de sodio dentro del interior hidrofóbico.
  • Los estudios de RMN revelan distintas poblaciones de iones de sodio: extracelulares, intracelulares y dentro de los dominios de la membrana.