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Las proteínas ER descifran el código de la tubulina para regular la distribución de los orgánulos

Pengli Zheng¹, Christopher J Obara², Ewa Szczesna³

¹Cell Biology Section, Neurogenetics Branch, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, MD, USA. shalemander@gmail.com.

|December 16, 2021

Resumen

Las células interpretan las modificaciones de los microtúbulos para posicionar los orgánulos. Tres proteínas del retículo endoplasmático (ER) se unen a tipos distintos de microtúbulos, regulando el posicionamiento de ER y las respuestas celulares durante el hambre.

Área de la Ciencia:

Biología celular
Biología molecular
La neurociencia

Sus antecedentes:

El posicionamiento de los organelos se basa en los microtúbulos, pero la interpretación de las modificaciones de los microtúbulos no está clara.
La morfología del retículo endoplasmático (ER) es crucial para la función celular y está relacionada con trastornos neurológicos y cáncer.

Objetivo del estudio:

Investigar cómo las células interpretan las modificaciones post-traducionales de los microtúbulos para el posicionamiento de los orgánulos.
Identificar las proteínas ER involucradas en el transporte de orgánulos basado en microtúbulos y sus funciones en las respuestas celulares.

Principales métodos:

Interacciones investigadas entre las proteínas ER (CLIMP63, KTN1, p180) y poblaciones específicas de microtúbulos.
Utilizó estrategias de nocaut y manipuló el estado de glutamilación de microtúbulos.
Redistribución de orgánulos y respuestas celulares observadas durante el hambre de nutrientes.

Principales resultados:

CLIMP63, KTN1 y p180 se unen a distintas poblaciones de microtúbulos (centrosomales, poliglutamilados y glutamilados).
La alteración de estas proteínas o modificaciones de microtúbulos cambia significativamente la posición de ER y otros orgánulos.
Las células modulan la unión de CLIMP63 y p180 durante la inanición para las respuestas autofágicas.

Conclusiones:

Las proteínas ER específicas actúan como intérpretes de los códigos de modificación de microtúbulos para controlar el posicionamiento de ER.
El posicionamiento ER basado en microtúbulos es dinámico y esencial para procesos celulares adaptativos como la autofagia.
La comprensión de estos mecanismos podría ofrecer información sobre el tratamiento de enfermedades relacionadas con la desregulación de la ER.

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