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El montaje y la función de las cadenas de ubiquitina heterotípicas en el ciclo celular y el control de la calidad de

Richard G Yau¹, Kerstin Doerner², Erick R Castellanos³

¹Department of Molecular and Cell Biology, University of California at Berkeley, Berkeley, CA, USA; Howard Hughes Medical Institute, Berkeley, CA, USA.

|October 17, 2017

Resumen

Los investigadores desarrollaron un nuevo anticuerpo para detectar cadenas específicas de ubiquitina (conectadas a K11/K48). Este descubrimiento revela su papel crucial en la regulación del ciclo celular y la limpieza de proteínas mal plegadas, incluidas las relacionadas con enfermedades neurodegenerativas.

Área de la Ciencia:

Biología molecular
Biología celular
La bioquímica

Sus antecedentes:

Las cadenas de ubiquitina son modificaciones críticas posteriores a la traducción que controlan el destino celular.
Distintos enlaces de cadena de ubiquitina (por ejemplo, K48, K63) median diferentes resultados celulares como la degradación de proteínas o el ensamblaje complejo.
Las funciones fisiológicas de las cadenas de ubiquitina heterotípicas (mixtas o ramificadas) eran poco conocidas debido a la falta de métodos de detección.

Objetivo del estudio:

Desarrollar un método para la detección de cadenas de ubiquitina heterotípicas endógenas.
Investigar las funciones biológicas de las cadenas de ubiquitina ligadas a K11/K48.
Para entender el papel de estas cadenas en el control de la calidad celular y la enfermedad.

Principales métodos:

Diseñado un anticuerpo bispecífico para detectar cadenas de ubiquitina ligadas a K11/K48.
Substratos endógenos identificados de cadenas ligadas a K11/K48 utilizando el anticuerpo.
Analizó la síntesis y el procesamiento de estas cadenas por ligasas y efectores de ubiquitina.

Principales resultados:

Se han identificado reguladores mitóticos, polipéptidos mal plegados y variantes patológicas de la huntingtina como sustratos para las cadenas ligadas a K11/K48.
Se ha demostrado que las cadenas ligadas a K11/K48 son sintetizadas por ligasas de ubiquitina esenciales implicadas en enfermedades neurodegenerativas.
Se ha demostrado que estos conjugados facilitan el aclaramiento proteasómico rápido de las proteínas propensas a la agregación.

Conclusiones:

Las cadenas de ubiquitina ligadas a K11/K48 juegan un papel importante en el control del ciclo celular y el control de la calidad de las proteínas.
Los conjugados de ubiquitina heterotípicos sirven como portadores importantes de información biológica.
Este trabajo proporciona una herramienta para estudiar las cadenas de ubiquitina heterotípicas y sus implicaciones en la salud y la enfermedad.

Palabras clave:

Huntingtina y sus derivados La enfermedad de Huntington complejo promotor de la anafase cadena de ubiquitina ramificada El proteasoma Control de la calidad de las proteínas Ubiquitina y sus derivados cadena de ubiquitina

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