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The Notch signaling pathway is a major intracellular signaling pathway that is highly conserved over a broad spectrum of metazoan species. It stands unique from other intracellular signaling mechanisms in animals because notch protein itself acts as the receptor as well as the primary signaling molecule.
The Notch gene came into the limelight in 1914 after the discovery that its mutation in Drosophila melanogaster leads to a serrated (or "notched") wing margin phenotype. It was not...
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Proteins are dynamic macromolecules that carry out a wide variety of essential processes; however, the activities of most proteins depend on their interactions with other molecules or ions, known as ligands.
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Updated: Mar 6, 2026

Cell Aggregation Assays to Evaluate the Binding of the Drosophila Notch with Trans-Ligands and its Inhibition by Cis-Ligands
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La estructura del complejo notch-Jagged implica un enlace de captura en la sintonización de la sensibilidad del

Vincent C Luca1,2, Byoung Choul Kim3,4, Chenghao Ge5

  • 1Departments of Molecular and Cellular Physiology and Structural Biology, Stanford University School of Medicine, Stanford, CA 94305, USA.

Science (New York, N.Y.)
|March 4, 2017
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Resumen

La activación del receptor de muesca se basa en la fuerza mecánica y la glicosilación. Los nuevos datos estructurales revelan cómo la unión de Jagged1 a Notch1 utiliza estas fuerzas para regular las decisiones del destino celular.

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Área de la Ciencia:

  • Biología celular
  • Biología estructural
  • La bioquímica

Sus antecedentes:

  • La señalización de la muesca es crucial para la determinación del destino celular.
  • Esta vía es única en su dependencia de las fuerzas mecánicas y la glicosilación de proteínas.
  • Comprender las interacciones moleculares es clave para descifrar la regulación de la vía de Notch.

Objetivo del estudio:

  • Para aclarar la base estructural de la interacción entre Notch1 y Jagged1 (Jag1).
  • Investigar el papel de la fuerza mecánica y la glicosilación en la unión Notch1-Jag1.
  • Para comparar la unión de Notch1 a Jag1 frente a los ligandos de tipo Delta 4 (DLL4).

Principales métodos:

  • Cristalografía de rayos X con una resolución de 2,5 angstroms.
  • Análisis de las interfaces de unión proteína-proteína.
  • Caracterización de las modificaciones de la glicosilación de proteínas (fucosa enlazada con O).

Principales resultados:

  • Se determinó una estructura detallada del complejo extracelular Notch1-Jag1.
  • La fucosa enlazada con O en los dominios 8 y 12 del EGF de Notch1 interactúa con los dominios Jag1 del EGF3 y C2.
  • Jag1 exhibe un comportamiento de enlace de captura sobre la unión de Notch1, influenciado por fuerzas mecánicas.
  • Notch1 utiliza diferentes dominios para la unión Jag1 en comparación con la unión DLL4.

Conclusiones:

  • Las fuerzas mecánicas y los patrones específicos de glicosilación son críticos para la interacción Notch1-Jag1.
  • El comportamiento de enlace de captura de Jag1 permite la regulación dependiente de la fuerza de la señalización de Notch.
  • Esto proporciona un mecanismo para la discriminación de ligandos y la potenciación de la señalización de Notch a través de señales mecánicas.