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Análisis alostérico basado en redes de la galectina-7: residuos clave dictan la comunicación funcional y la
N T Hang Pham1, Alex Paré1, Myriam Létourneau1
1Centre Armand-Frappier Santé Biotechnologie, Institut National de la Recherche Scientifique (INRS), Université du Québec, Laval, Québec, Canada.
Protein science : a publication of the Protein Society
|February 17, 2026
Resumen
El análisis de redes computacionales identificó residuos clave que controlan la actividad de la proteína galectina-7 humana (GAL-7). La interrupción de esta red afecta el papel de GAL-7 en la apoptosis, ofreciendo una nueva estrategia para el diseño de fármacos.
Área de la Ciencia:
- Bioquímica
- Biología Computacional
- Biología Estructural
Sus antecedentes:
- La modulación alostérica ofrece un control preciso de las proteínas, pero el diseño de inhibidores selectivos es un desafío.
- Los métodos actuales de cribado de moduladores alostéricos son costosos y requieren mucho tiempo, lo que hace necesarias estrategias computacionales predictivas.
Objetivo del estudio:
- Desarrollar un enfoque computacional para predecir nodos de comunicación alostérica en proteínas homodiméricas.
- Identificar residuos clave que regulan la actividad proapoptótica de la galectina-7 humana (GAL-7).
Principales métodos:
- Se combinaron análisis de redes y de caminos más cortos para identificar nodos de comunicación interprotómero.
- Se crearon variantes de proteínas modificadas mediante la mutación de residuos clave identificados (R20, R22, D103).
- Se utilizaron análisis biofísicos y estructurales para validar las predicciones y evaluar la estabilidad del dímero y la comunicación.
Principales resultados:
- Se identificó una red electrostática mínima (R20-R22-D103) como un nodo alostérico crítico en GAL-7.
- Las variantes modificadas (R20A, R22A, D103A, R20A-R22A) alteraron la apoptosis inducida por GAL-7 en células T humanas.
- La interrupción de la interacción R20-D103 debilitó la comunicación interprotómero y desestabilizó el dímero de GAL-7.
Conclusiones:
- La huella dactilar de redes de residuos permite el mapeo predictivo de las vías de comunicación globales en proteínas.
- R20, R22 y D103 son determinantes alostéricos clave de la función de GAL-7.
- El marco integrador proporciona una estrategia generalizable para el diseño racional de moduladores alostéricos para proteínas homodiméricas.
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