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Updated: Aug 8, 2026

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La proteína priónica celular se une al cobre in vivo

D R Brown¹, K Qin, J W Herms

¹Department of Neuropathology, Georg-August-Universität Göttingen, Germany.

|December 31, 1997

Resumen

La proteína priónica celular (PrPC) se une al cobre (Cu) en el cerebro. Los ratones con el gen PrPC ablado muestran niveles reducidos de cobre y funciones celulares alteradas, lo que indica que el PrPC actúa como una proteína de unión al cobre in vivo.

Área de la Ciencia:

La neurociencia es la neurociencia.
La bioquímica es la bioquímica.
Biología del Prión Biología del Prión

Sus antecedentes:

La proteína priónica celular normal (PrPC) está implicada como precursora de las formas patógenas (PrPSc) que causan enfermedades neurodegenerativas como la EEB y la ECJ.
La región de repetición octapeptídica en el extremo amino de PrPC está altamente conservada en todos los mamíferos.

Objetivo del estudio:

Investigar la interacción entre el PrPC y los iones de cobre (Cu (II)).
Para determinar la relevancia fisiológica de la unión PrPC-cobre in vivo.

Principales métodos:

Utilizó ratones PrPC gen-ablados (Prnp0/0) para evaluar el contenido de cobre y los fenotipos celulares.
Se analizó la afinidad de unión al cobre y la cooperatividad del dominio amino-terminal del PrPC a pH neutro.
Examinó los niveles de cobre en varias fracciones subcelulares de extractos cerebrales.

Principales resultados:

Se demostró que el dominio amino-terminal de PrPC se une a Cu (II) en cinco o seis sitios con cooperatividad positiva.
Se observó un contenido de cobre significativamente reducido en extractos cerebrales, fracciones sinaptosomales y enriquecidas con endosomas de ratones Prnp0/0.
Se han reportado fenotipos celulares alterados en ratones Prnp0/0, incluida la actividad reducida de la superóxido de cobre/zinco dismutasa y respuestas electrofisiológicas modificadas.

Conclusiones:

El PrPC funciona como una proteína de unión al cobre (Cu-metaloproteína) in vivo.
La interacción de PrPC con el cobre influye en las funciones celulares y puede ser relevante para las enfermedades relacionadas con los priones.

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