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Electron carriers can be thought of as electron shuttles. These compounds can easily accept electrons (i.e., be reduced) or lose them (i.e., be oxidized). They play an essential role in energy production because cellular respiration is contingent on the flow of electrons.
Over the many stages of cellular respiration, glucose breaks down into carbon dioxide and water. Electron carriers pick up electrons lost by glucose in these reactions, temporarily storing and releasing them into the electron...
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Transcellular transport of solutes is the movement of substances like monosaccharides and amino acids through polarized cells. This transport mechanism is primarily seen in epithelial and endothelial cells aided by membrane transport proteins such as channels and transporters. The tight junctions between these cells confine the membrane proteins to the two sides of the cell. The epithelial cells have distinct apical and basolateral domains. In contrast, the endothelial cells show the luminal...
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The energy released from the breakdown of the chemical bonds within nutrients can be stored either through the reduction of electron carriers or in the bonds of adenosine triphosphate (ATP). In living systems, a small class of compounds functions as mobile electron carriers, molecules that bind to and shuttle high-energy electrons between compounds in pathways. The principal electron carriers that will be considered originate from the B vitamin group and are derivatives of nucleotides; they are...
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El huésped-[2]rotaxanos como agentes de transporte celular.

Vadims Dvornikovs1, Brian E House, Marcia Kaetzel

  • 1Department of Chemistry, University of Cincinnati, Cincinnati, Ohio 45221, USA.

Journal of the American Chemical Society
|July 3, 2003
PubMed
Resumen

Los rotaxanos anfitrión-[2], con un anillo de éter dibenzo-24-corona-8, actúan como agentes de transporte celular efectivos. Se unen eficientemente a los aminoácidos y fluoróforos, facilitando la captación celular, incluido el transporte nuclear.

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Área de la Ciencia:

  • Química supramolecular de las moléculas.
  • Biología Química Biología química.
  • Ciencia de los materiales Ciencia de los materiales.

Sus antecedentes:

  • Los rotaxanos anfitrión-[2] están diseñados como estructuras supramoleculares con aplicaciones potenciales en el transporte molecular.
  • Las fracciones de éter y ciclófano de dibenzo-24-corona-8 (DB24C8) son componentes clave que influyen en las interacciones huésped-huésped.
  • Comprender las afinidades de unión y las capacidades de transporte de estos rotaxanos es crucial para su desarrollo.

Objetivo del estudio:

  • Investigar las afinidades de unión de los rotaxanos huésped-[2] con varios huéspedes en diferentes sistemas de disolventes.
  • Para evaluar la eficiencia del transporte celular de estos rotaxanos para moléculas biológicamente relevantes.
  • Para comparar las capacidades de transporte de diferentes arquitecturas de rotaxano.

Principales métodos:

  • Síntesis y caracterización de rotaxanos huésped-[2] con grupos ciclófanos o aromáticos bloqueadores de hendiduras.
  • Determinación espectroscópica de las constantes de asociación (K(A)) para la unión del huésped en tampón acuoso, DMSO y sistemas de disolventes mixtos.
  • Estudios de captación celular utilizando huéspedes con etiqueta fluorescente y células COS-7 para evaluar la eficiencia del transporte.

Principales resultados:

  • Los rotaxanos anfitrión-[2] exhiben fuertes constantes de asociación (10^4 a 10^5 M^-1) para los huéspedes pépticos y los fluoróforos en los disolventes probados.
  • La arquitectura de rotaxano mejora la unión del huésped en comparación con el componente de ciclófano solo.
  • El ciclofano-[2]rotaxano 1 transporta eficientemente la fluoresceína y un inhibidor de la fluoresceína-PKC a las células COS-7, incluido el núcleo.
  • El cleft-[2]rotaxano 2 muestra un transporte de fluoresceína menos eficiente a pesar de una afinidad de unión similar, lo que indica una entrega celular dependiente de la arquitectura.

Conclusiones:

  • Los rotaxanos anfitrión-[2] son transportadores moleculares efectivos capaces de unirse a diversos huéspedes con alta afinidad.
  • La estructura del rotaxano es ventajosa para el reconocimiento molecular y la unión.
  • La arquitectura específica del rotaxano influye significativamente en la eficiencia de absorción celular, destacando la importancia del diseño estructural para una entrega dirigida.