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Identification and Characterization of Protein Glycosylation using Specific Endo- and Exoglycosidases
Published on: December 26, 2011
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La transferasa O-GlcNAc cataliza la proteólisis específica del sitio del HCF-1
Francesca Capotosti1, Sophie Guernier, Fabienne Lammers
1Center for Integrative Genomics, University of Lausanne, Switzerland.
Cell
|February 8, 2011
Resumen
La enzima O-ligada β-N-acetilglucosamina transferasa (OGT) divide y modifica directamente la proteína HCF-1, un regulador clave del ciclo celular. Esta actividad OGT es crucial para la maduración de HCF-1 y su papel en la división celular.
Área de la Ciencia:
- Biología Molecular Biología Molecular
- Biología celular Biología celular.
- La epigenética es la epigenética.
Sus antecedentes:
- La proteína humana HCF-1 es un regulador epigenético esencial para el control del ciclo celular.
- HCF-1 se somete a maduración proteolítica, dando subunidades N-terminal (HCF-1(N)) y C-terminal (HCF-1(C)).
- La escisión proteolítica en las repeticiones de HCF-1 (PRO) es vital para la función de HCF-1 (C) durante la fase M.
Objetivo del estudio:
- Investigar el papel de la β-N-acetilglucosamina transferasa (OGT) en la maduración del HCF-1.
- Para aclarar el mecanismo por el cual OGT influye en el procesamiento proteolítico HCF-1 y la regulación del ciclo celular.
Principales métodos:
- Investigó la interacción entre las secuencias de repetición de OGT y HCF-1(PRO).
- Se evaluó la O-GlcNAcilación de HCF-1 (N) por OGT.
- Se analizó el efecto de reemplazar las repeticiones HCF-1(PRO) con señales alternativas de escisión en la función HCF-1.
Principales resultados:
- OGT reconoce y divide directamente las secuencias de repetición HCF-1 (((PRO).
- OGT media la O-GlcNAcilación de la subunidad HCF-1 (N).
- Sustituir las repeticiones de HCF-1(PRO) con otras señales de escisión permitió la proteólisis pero no la activación de HCF-1(C) para la progresión de la fase M.
Conclusiones:
- OGT juega un papel directo y esencial en la maduración proteolítica de HCF-1.
- El estudio revela un nuevo vínculo entre la O-GlcNAcilación mediada por OGT y el procesamiento proteolítico HCF-1.
- Este nexo es crítico para la regulación adecuada del ciclo celular por HCF-1.
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