Video Experimental Relacionado
Updated: May 10, 2026
07:56
Modified Yeast-Two-Hybrid System to Identify Proteins Interacting with the Growth Factor Progranulin
Published on: January 17, 2012
Estructura de la molécula de guía repulsiva (RGM) - neogenina en el cubo de señalización
Christian H Bell1, Eleanor Healey1, Susan van Erp2
1Division of Structural Biology, Wellcome Trust Centre for Human Genetics, University of Oxford, Roosevelt Drive, Oxford OX3 7BN, UK.
Science (New York, N.Y.)
|June 8, 2013
Resumen
Los miembros de la familia de moléculas de guía repulsiva (RGM) emiten señales a través de la neogenina (NEO1) a través de un mecanismo estructural conservado. Este estudio revela el pliegue de la proteína RGMB y su interacción con NEO1, explicando los procesos celulares mediados por RGM.
Área de la Ciencia:
- Biología Molecular Biología Molecular
- Biología Estructural Biología estructural.
- Biología celular Biología celular.
Sus antecedentes:
- Los miembros de la familia de moléculas de guía repulsiva (RGM) son reguladores cruciales de las funciones celulares, incluida la motilidad celular, la adhesión, las respuestas inmunes y el metabolismo del hierro.
- El mecanismo preciso por el cual los RGM inician la señalización a través de su receptor, la neogenina (NEO1), sigue siendo en gran medida no caracterizado.
Objetivo del estudio:
- Para aclarar la base estructural de la formación del complejo RGM-NEO1 y la iniciación de la señalización.
- Caracterizar la estructura de RGMB (dragón) y su interacción con NEO1.
Principales métodos:
- Se empleó cristalografía de rayos X para determinar las estructuras de la región de unión de RGM de NEO1 y el complejo NEO1-RGMB.
- Se utilizaron ensayos bioquímicos para investigar las implicaciones funcionales de las estructuras y mecanismos observados.
Principales resultados:
- La estructura cristalina de RGMB reveló un nuevo pliegue de proteínas y un mecanismo de escisión autocatalítico crítico para la función de RGM.
- La estructura del complejo NEO1-RGMB demostró que los ectodominios RGMB estabilizan los receptores NEO1 de una manera dependiente del pH.
- Esta arquitectura compleja RGM-NEO1 se conserva en diferentes miembros de la familia RGM, lo que indica un mecanismo de señalización común.
Conclusiones:
- Los hallazgos proporcionan un marco estructural para comprender cómo los RGM inician la señalización a través de NEO1.
- La arquitectura conservada identificada de los complejos RGM-NEO1 es fundamental para múltiples vías de señalización reguladas por los RGM.
- Este trabajo ofrece información sobre las mutaciones asociadas a la enfermedad en RGM y posibles estrategias terapéuticas.
Más Videos Relacionados
Videos de Conceptos Relacionados
01:30Assembly of Signaling Complexes
Multiprotein signaling complexes are formed in a dynamic process involving protein-protein interactions at the cytoplasmic domain of transmembrane receptors or enzymatic and non-enzymatic proteins associated with the receptor. These complexes ensure the activation and propagation of intracellular signals that regulate cell functions.
Interaction domains in cell signaling
Interaction domains recognize exposed features of their binding partners containing post-translationally modified sequences,...
Interaction domains in cell signaling
Interaction domains recognize exposed features of their binding partners containing post-translationally modified sequences,...
01:14Rab Proteins
Rab proteins constitute the largest family of monomeric GTPases, of which 70 members are present in humans. Rab proteins and their effectors regulate consecutive stages of vesicle transport such as vesicle transport, docking, and fusion to the correct recipient membrane.
Rab proteins switch between a cytosolic, GDP-bound inactive state and a membrane-anchored, GTP-bound active state. By themselves, Rabs show slow rates of GDP/GTP exchange and GTP hydrolysis. Thus, Rab proteins are considered...
Rab proteins switch between a cytosolic, GDP-bound inactive state and a membrane-anchored, GTP-bound active state. By themselves, Rabs show slow rates of GDP/GTP exchange and GTP hydrolysis. Thus, Rab proteins are considered...
01:24Small GTPases - Ras and Rho
Ras and Rho are small monomeric GTPases that act downstream of receptor tyrosine kinase (RTK) and regulate various cellular processes. These GTPases switch between active and inactive states by binding to guanine nucleotides.
Three regulatory proteins control their activity:
Three regulatory proteins control their activity:
01:22Activation and Inactivation of G Proteins
Heterotrimeric G proteins are guanine nucleotide-binding proteins. As the name suggests, heterotrimeric G proteins are composed of three subunits: alpha, beta, and gamma. They remain GDP-bound or GTP-bound inside the cells and switch between inactive/active states. The Gα subunit possesses the nucleotide-binding pocket that binds guanine nucleotides and switches between GDP or GTP-bound states. In contrast, the Gꞵ and Gγ subunits are always bound together with high affinity and are together...
03:14Notch Signaling Pathway
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 until 1985...
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 until 1985...
03:14Notch Signaling Pathway
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 until 1985...
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 until 1985...