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Las mutaciones relacionadas con enfermedades neurológicas mejoran la autoasociación de secuencias de proteínas de

Xiaoming Zhou¹, Lily Sumrow¹, Kyuto Tashiro¹

¹Department of Biochemistry, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA.

Science (New York, N.Y.)

|June 30, 2022

Resumen

Las proteínas con dominios de baja complejidad (LCD) pueden formar estructuras celulares dinámicas. Las mutaciones relacionadas con las enfermedades neurodegenerativas mejoran la estabilidad de estas estructuras, lo que afecta la organización celular.

Área de la Ciencia:

La bioquímica
Biología celular
La neurociencia

Sus antecedentes:

Los dominios de proteínas de baja complejidad de secuencia (LCD) están intrínsecamente desordenados y no forman estructuras 3D estables.
Estas LCD juegan un papel crítico en la organización celular, formando estructuras dinámicas no ligadas a la membrana.
La autoasociación transitoria de las LCD, mediada por estructuras labiles y transversales, subyace a la naturaleza dinámica de estos conjuntos.

Objetivo del estudio:

Investigar el papel de las estructuras de proteínas labiles en la autoasociación de las LCD.
Explorar cómo las mutaciones específicas asociadas con enfermedades neurodegenerativas afectan la autoasociación LCD y las estructuras celulares.

Principales métodos:

Se utilizaron ensayos de separación de fase para estudiar la autoasociación LCD.
Analizó el impacto de las mutaciones de mal sentido encontradas en la enfermedad de Charcot-Marie-Tooth, la demencia frontotemporal y la enfermedad de Alzheimer en las estructuras moleculares de LCD in vitro y en cultivos celulares.

Principales resultados:

Se ha demostrado que la autoasociación LCD se rige por estructuras de proteínas cercanas al equilibrio plegado-desplegado.
Se ha demostrado que las mutaciones asociadas a la enfermedad estabilizan estas estructuras LCD labiles.
Se observó que la estabilidad mejorada de estas estructuras contribuye a la fisiopatología en modelos celulares.

Conclusiones:

Las estructuras de proteínas labiles dictan críticamente la autoasociación LCD y la formación de ensamblajes celulares dinámicos.
Las mutaciones asociadas a la enfermedad pueden interrumpir la organización celular al aumentar la estabilidad de las interacciones mediadas por LCD.
Estos hallazgos proporcionan información sobre los mecanismos moleculares subyacentes a las enfermedades neurodegenerativas vinculadas a la disfunción LCD.

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