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Bases moleculares de la actividad SIFI en la respuesta integrada al estrés

Zhi Yang^1,2, Diane L Haakonsen^1,2,3, Michael Heider¹

¹Department of Molecular and Cell Biology, University of California at Berkeley, Berkeley, CA, USA.

|May 6, 2025

Resumen

El factor de silenciamiento de la enzima de respuesta integrada al estrés (SIFI) detecta el estrés celular y termina la señalización del estrés. Este mecanismo asegura la homeostasis celular mediante la degradación de las proteínas dañadas, previniendo las enfermedades degenerativas.

Área de la Ciencia:

Biología celular
Biología molecular
La bioquímica

Sus antecedentes:

La activación de la respuesta al estrés crónico afecta la supervivencia celular y conduce a enfermedades degenerativas.
Los organismos utilizan factores silenciadores, como la E3 ubiquitina ligasa SIFI, para poner fin a la señalización del estrés y mantener la homeostasis celular.
Los mecanismos precisos por los cuales los factores silenciadores detectan el estrés e inactivan las respuestas al estrés siguen siendo poco conocidos.

Objetivo del estudio:

Aclarar la base estructural y mecanicista de cómo el factor de silenciamiento de la respuesta integrada al estrés (SIFI) silenciará la respuesta integrada al estrés.
Comprender cómo el SIFI detecta los indicadores de estrés y los componentes de la vía de respuesta al estrés.

Principales métodos:

Análisis del SIFI endógeno por criomicroscopía.
El modelado de AlphaFold.
Estudios bioquímicos.

Principales resultados:

SIFI utiliza dominios flexibles en un andamio accesible para detectar indicadores de estrés y componentes de respuesta.
SIFI construye cadenas de ubiquitina específicas de enlace en módulos de alargamiento distintos y estéricamente restringidos.
Un dominio similar a la ubiquitina facilita la transferencia de ubiquitina, acoplando la modificación del sustrato a la formación de polímeros de ubiquitina.

Conclusiones:

SIFI emplea un mecanismo catalítico para procesar diversas proteínas, lo que le permite monitorear y modular estados celulares complejos durante el estrés.
Comprender el mecanismo de SIFI proporciona información sobre la homeostasis celular y los posibles objetivos terapéuticos para las enfermedades degenerativas relacionadas con el estrés.

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