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Estructura fibrilar de la proteína CAHS-8 de tardígrado protectora contra la desecación

Anas Malki^1,2, Jean-Marie Teulon¹, Emmi A Mikkola¹

¹Univ. Grenoble Alpes, CNRS, CEA, Institut de Biologie Structurale, Grenoble, France.

Angewandte Chemie (International ed. in English)

|December 31, 2025

Resumen

Las proteínas abundantes en el citosol y solubles en calor (CAHS) protegen a los tardígrados de la desecación. La estructura cristalina de las fibrillas de CAHS-8 revela un ensamblaje atípico de dímeros de ovillo-ovillo crucial para la supervivencia celular bajo estrés.

Área de la Ciencia:

Biología Estructural
Biofísica
Biología de Extremófilos

Sus antecedentes:

Las proteínas abundantes en el citosol y solubles en calor (CAHS) son clave para la supervivencia de los tardígrados frente a estresores ambientales como la desecación.
La proteína CAHS-8 del tardígrado *Hypsibius exemplaris* está intrínsecamente desordenada y forma fibras de hidrogel protectoras bajo estrés.

Objetivo del estudio:

Elucidar la base estructural de la formación de fibrillas de CAHS-8 y su papel en la tolerancia a la desecación.
Comprender el mecanismo de ensamblaje molecular de las fibrillas de CAHS-8.

Principales métodos:

Cristalografía de rayos X para determinar la estructura de las fibrillas.
Microscopía electrónica y microscopía de fuerza atómica para análisis morfológico.
Modelado de desorden para complementar los datos estructurales.

Principales resultados:

La estructura cristalina revela que las fibrillas de CAHS-8 están formadas por dímeros atípicos de ovillo-ovillo (90 aminoácidos) de una sola hélice.
Una segunda interfaz de ovillo-ovillo media el ensamblaje de estos dímeros en fibrillas.
Las fibrillas exhiben interacciones por pares, que involucran potencialmente colas intrínsecamente desordenadas.

Conclusiones:

El ensamblaje único de ovillo-ovillo de CAHS-8 proporciona información estructural sobre los mecanismos de protección contra el estrés en tardígrados.
Esta estructura es esencial para formar hidrogeles que permiten la supervivencia celular durante condiciones extremas.
La comprensión del ensamblaje de CAHS-8 ofrece potencial para aplicaciones en biomateriales y biotecnología.

Palabras clave:

Fibra Proteína intrínsecamente desordenada Biología estructural Tardígrado Difracción de rayos X

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