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Ligand-Gated Ion Channel Receptor: Gating Mechanism01:30

Ligand-Gated Ion Channel Receptor: Gating Mechanism

Ligand-gated ion channels are transmembrane proteins that play a vital role in intercellular communication and functions of the nervous system. They allow the influx of ions across the membrane once the neurotransmitter binds, allowing the subsequent transmission of electrical excitation across the neurons. Other ligand-gated ion channels, like the γ-aminobutyric acid (GABA) receptor, permit anions like chloride into the cells on the binding of the GABA molecule. Their entry into the cell...
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.
Compared to the gated ion channels, the non-gated channels, also known as leakage or passive channels, have no gating mechanism.
Mechanically-gated Ion Channels01:12

Mechanically-gated Ion Channels

Mechanically-gated ion channels are proteins found in eukaryotic and prokaryotic cell membranes that open in response to mechanical stress. Tension, compression, swelling, and shear stress can alter the conformation of the protein, opening a transmembrane channel that allows the passage of ions for signal transmission. In eukaryotes, mechanically-gated channels are distributed in several regions like the neurons, lungs, skin, bladder, and heart, where they play critical roles in numerous...
Mechanically-gated Ion Channels01:12

Mechanically-gated Ion Channels

Mechanically-gated ion channels are proteins found in eukaryotic and prokaryotic cell membranes that open in response to mechanical stress. Tension, compression, swelling, and shear stress can alter the conformation of the protein, opening a transmembrane channel that allows the passage of ions for signal transmission. In eukaryotes, mechanically-gated channels are distributed in several regions like the neurons, lungs, skin, bladder, and heart, where they play critical roles in numerous...
Chemical Synapses01:26

Chemical Synapses

Chemical synapses are specialized sites between two neurons or between a neuron and a non-neuronal cell like a muscle, glandular or sensory cell.
Because chemical synapses depend on the release of neurotransmitter molecules from synaptic vesicles to pass on their signal, there is an approximately one millisecond delay between when the axon potential reaches the presynaptic terminal and when the neurotransmitter leads to opening of postsynaptic ion channels. Additionally, this signaling is...

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Published on: November 3, 2010

Una lanzadera molecular STOP-GO con puertas de luz.

Ali Coskun1, Douglas C Friedman, Hao Li

  • 1Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208-3113, USA.

Journal of the American Chemical Society
|February 6, 2009
PubMed
Resumen

Los investigadores diseñaron lanzaderas moleculares utilizando puertas operadas por luz. Al incorporar grupos de metilo o de flúor en las unidades de azobifeniloxi, controlaron el transbordador.

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Área de la Ciencia:

  • Química supramolecular de las moléculas.
  • Las máquinas moleculares son máquinas moleculares.
  • La fotoquímica es la fotoquímica.

Sus antecedentes:

  • Los rotaxanos degenerados [2] presentan un equilibrio dinámico con barreras de energía de activación baja para el transporte.
  • Las barreras de velocidad (barreras estéricas/electrostáticas) pueden aumentar significativamente estas barreras energéticas.
  • La unidad 4,4'-azobiphenyloxy (ABP) ofrece potencial como una puerta sensible a la luz en los sistemas moleculares.

Objetivo del estudio:

  • Para diseñar lanzaderas moleculares controladas por luz mediante la modificación de las unidades ABP.
  • Para investigar el impacto de las modificaciones estéricas (grupos metilo) y electrónicas (átomos de flúor) en la función de la puerta del transbordador.
  • Para demostrar un control preciso sobre la dinámica de la lanzadera molecular utilizando la luz y la energía térmica.

Principales métodos:

  • Derivados ABP sintetizados con cuatro grupos metilo (ABP-Me) y cuatro átomos de flúor (ABP-F).
  • Utilizó UV y luz visible para modular el estado de la puerta.
  • Investigó la energía libre de activación (DeltaG‡) para el proceso de transporte en diferentes condiciones de luz.

Principales resultados:

  • ABP-Me(4) resultó en una puerta permanentemente cerrada, lo que indica un obstáculo estérico efectivo.
  • ABP-F(4) demostró un comportamiento de conmutación de luz: cerrado por luz UV, abierto por luz visible.
  • Se demostró que la luz controla reversiblemente la barrera de la energía libre, permitiendo los estados "STOP" y "GO".

Conclusiones:

  • Las modificaciones a medida de las unidades ABP permiten la creación de puertas moleculares dirigibles a la luz.
  • El control fotoquímico sobre las propiedades estéricas y electrónicas permite la regulación dinámica del movimiento de la lanzadera molecular.
  • Esta investigación proporciona una vía para el desarrollo de máquinas moleculares avanzadas con funciones programables.