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ATG14 promueve la unión de membranas y la fusión de los autofagosomas a los endolisosomas

Jiajie Diao¹, Rong Liu², Yueguang Rong³

¹1] Department of Molecular and Cellular Physiology, Stanford University, Stanford, California 94305, USA [2] Department of Structural Biology, Stanford University, Stanford, California 94305, USA [3] Department of Photon Science, Stanford University, Stanford, California 94305, USA [4] Department of Neurology and Neurological Sciences, Stanford University, Stanford, California 94305, USA [5] Howard Hughes Medical Institute, Stanford University, Stanford, California 94305, USA.

|February 18, 2015

Resumen

La proteína ATG14 es crucial para la autofagia al promover la fusión de la membrana entre los autofagosomas y los lisosomas. Su homooligomerización es esencial para este proceso, asegurando la degradación de la carga en diversas enfermedades humanas.

Área de la Ciencia:

Biología celular Biología celular.
Biología Molecular Biología Molecular
La bioquímica es la bioquímica.

Sus antecedentes:

La autofagia es un proceso catabólico vital para la salud y la enfermedad celular, que implica la formación de autofagosomas y la fusión con los lisosomas.
La fusión eficiente de la membrana es crítica tanto para la biogénesis del autofagosoma como para la degradación de la carga, sin embargo, su regulación sigue siendo poco comprendida.

Objetivo del estudio:

Aclarar el papel de ATG14 en la regulación de la unión y fusión de la membrana autofágica.
Investigar los mecanismos moleculares por los cuales ATG14 facilita la fusión autofagosoma-endolisosoma.

Principales métodos:

Ensayos de fusión de liposomas y proteoliposomas in vitro.
Análisis bioquímico de las interacciones complejas SNARE.
Estudios utilizando modelos celulares con defecto de homooligomerización ATG14.

Principales resultados:

ATG14 promueve el enlace de la membrana y mejora la fusión mediada por SNARE (sintaxina 17, SNAP29, VAMP8).
ATG14 se une a la sintaxina 17 a través de su dominio en espiral, estabilizando el complejo t-SNARE en los autofagosomas.
La homooligomerización de ATG14 es esencial para su actividad promotora de la fusión; los mutantes bloquean la fusión autofagosoma-endolisosoma.

Conclusiones:

El oligómero ATG14 actúa como un regulador específico de la autofagia, uniéndose directamente a las SNARE para facilitar la fusión autofagosoma-endolisosoma.
Este mecanismo pone de relieve una nueva vía para controlar el flujo autofágico y el despacho de carga.
Comprender el papel de ATG14 ofrece información sobre las enfermedades asociadas con la disfunción autofágica.

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