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Videos de Conceptos Relacionados

Gap Junctions01:37

Gap Junctions

Multicellular organisms employ a variety of ways for cells to communicate with each other. Gap junctions are specialized proteins that form pores between neighboring cells in animals, connecting the cytoplasm between the two, and allowing for the exchange of molecules and ions. They are found in a wide range of invertebrate and vertebrate species, mediate numerous functions including cell differentiation and development, and are associated with numerous human diseases, including cardiac and...
Ligand Binding and Linkage00:49

Ligand Binding and Linkage

Allosteric proteins have more than one ligand binding site; the binding of a ligand to any of these sites influences the binding of ligands to the other sites. When a protein is allosteric, its binding sites are called coupled or linked.  In the case of enzymes, the site that binds to the substrate is known as the active site and the other site is known as the regulatory site. When a ligand binds to the regulatory site, this leads to conformational changes in the protein that can influence the...
Ligand Binding and Linkage00:49

Ligand Binding and Linkage

Allosteric proteins have more than one ligand binding site; the binding of a ligand to any of these sites influences the binding of ligands to the other sites. When a protein is allosteric, its binding sites are called coupled or linked.  In the case of enzymes, the site that binds to the substrate is known as the active site and the other site is known as the regulatory site. When a ligand binds to the regulatory site, this leads to conformational changes in the protein that can influence the...
Ligand-gated Ion Channels01:19

Ligand-gated Ion Channels

Ligand-gated ion channels are transmembrane proteins with a channel for ions to pass through and a binding site for a ligand. The channel opens only when a ligand attaches to the binding site.
Three Subfamilies of Ligand-gated Ion Channels
Ligand-gated ion channels fall into three subfamilies. The 'Cys-loop' includes the nicotinic acetylcholine receptors, γ-aminobutyric acid (GABA), glycine, and 5-hydroxytryptamine receptors. The second one is the 'Pore-loop' channels that include the...
Gap Junctions01:27

Gap Junctions

The cytoplasm of adjacent animal cells can exchange small molecules, ions, and secondary messengers via the communication channels which form the gap junctions. These junctions comprise a few hundred to thousands of molecular channels, each made of two halves, called the connexon hemichannel. A connexon is a hexamer of six transmembrane connexin proteins, which assemble radially, thus forming a pore or channel in the center. One connexon hemichannel docks with a corresponding connexon on the...
Ligand-gated Ion Channels01:19

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Ligand-gated ion channels are transmembrane proteins with a channel for ions to pass through and a binding site for a ligand. The channel opens only when a ligand attaches to the binding site.
Three Subfamilies of Ligand-gated Ion Channels
Ligand-gated ion channels fall into three subfamilies. The 'Cys-loop' includes the nicotinic acetylcholine receptors, γ-aminobutyric acid (GABA), glycine, and 5-hydroxytryptamine receptors. The second one is the 'Pore-loop' channels that include the...

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Video Experimental Relacionado

Updated: Jun 30, 2026

Insertion of Flexible Neural Probes Using Rigid Stiffeners Attached with Biodissolvable Adhesive
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Published on: September 27, 2013

Representa la flexibilidad del receptor en el acoplamiento de ligandos a través de los modos normales relevantes.

Claudio N Cavasotto1, Julio A Kovacs, Ruben A Abagyan

  • 1Molsoft LLC, 3366 North Torrey Pines Court, Suite 300, La Jolla, California 92037, USA. claudio@molsoft.com

Journal of the American Chemical Society
|June 30, 2005
PubMed
Resumen
Este resumen es generado por máquina.

Este estudio introduce un nuevo método de modo normal para modelar la flexibilidad del receptor en el descubrimiento de fármacos. El enfoque mejora la precisión de acoplamiento de ligandos y mejora el cribado virtual al generar diversas conformaciones de receptores.

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Área de la Ciencia:

  • Biología computacional Biología computacional.
  • Biología Estructural Biología estructural.
  • Descubrimiento de Drogas Descubrimiento de Drogas

Sus antecedentes:

  • Las interacciones ligando-receptor son cruciales en el descubrimiento de fármacos.
  • Los métodos de acoplamiento existentes a menudo tienen dificultades para representar con precisión la flexibilidad del receptor.
  • La flexibilidad de las proteínas, especialmente en los bolsillos de unión, tiene un impacto significativo en la afinidad de unión de ligandos.

Objetivo del estudio:

  • Desarrollar una metodología basada en el modo normal para incorporar la flexibilidad del receptor en el acoplamiento de ligandos y el cribado virtual.
  • Abordar las limitaciones de los métodos existentes para representar deformaciones complejas de proteínas.
  • Mejorar la precisión y eficiencia de las herramientas de descubrimiento de fármacos basadas en la estructura.

Principales métodos:

  • Se introdujo una medida de relevancia para los modos normales para identificar los modos clave de flexibilidad.
  • Generó un conjunto de conformaciones de receptores al perturbar a lo largo de los modos normales relevantes.
  • Empleado acoplamiento totalmente flexible y acoplamiento de conjunto de receptores para la detección virtual.
  • Evaluó el método en las estructuras holo y apo de la proteína quinasa dependiente de cAMP.

Principales resultados:

  • El método captura efectivamente la flexibilidad del bucle en la proteína quinasa dependiente de cAMP utilizando un número limitado de modos de baja frecuencia.
  • La precisión de acoplamiento mejoró, con los ligandos alcanzando dentro de 1,5 Å de las estructuras objetivo.
  • El rendimiento del cribado virtual fue mejorado, indicado por un factor de enriquecimiento mejorado.
  • Se ha demostrado una mejor discriminación entre aglutinantes y no aglutinantes.

Conclusiones:

  • El enfoque de modo normal desarrollado integra sistemáticamente el acoplamiento de receptores flexibles ligando-flexibles.
  • Esta metodología representa un avance significativo para el descubrimiento de fármacos basados en la estructura.
  • El enfoque ofrece un modelado más realista de la flexibilidad de las proteínas en el cribado computacional.