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Modulación de las características de unión de carbohidratos y las características conformacionales de la lectina y la
Sneha Banerjee1, Saradamoni Mondal1, Musti J Swamy1
1School of Chemistry, University of Hyderabad, Hyderabad 500 046, India.
The journal of physical chemistry. B
|August 29, 2025
Resumen
El apiñamiento macromolecular altera significativamente la jacalina
Área de la Ciencia:
- La bioquímica
- Biología estructural
Sus antecedentes:
- Las interacciones proteína-carbohidrato son vitales para las funciones celulares.
- Las lectinas, como la jacalina, son proteínas clave en estas interacciones.
- Comprender el comportamiento de la lectina en entornos abarrotados es crucial para aplicaciones biológicas y médicas.
Objetivo del estudio:
- Investigar el impacto de la aglomeración macromolecular en la estructura, la estabilidad y las propiedades de unión de carbohidratos de la jacalina.
- Determinar cómo los diferentes tamaños y concentraciones de crowders afectan la conformación y función de la jacalina.
Principales métodos:
- Espectroscopia de dicroísmo circular (CD) para evaluar los cambios secundarios en la estructura.
- Espectroscopia de fluorescencia intrínseca para sondear la conformación de las proteínas.
- Calorimetría de barrido diferencial (DSC) y espectroscopia de fluorescencia para evaluar la estabilidad térmica y química.
- Ensayos de unión de carbohidratos para medir los cambios de afinidad.
Principales resultados:
- El apiñamiento macromolecular alteró el contenido de jacalina de la hoja β hasta en un 50%.
- Los crowders más pequeños (D6) causaron una mayor perturbación estructural y una afinidad de unión de carbohidratos reducida en comparación con los crowders más grandes (D70).
- Crowders estabilizó la jacalina contra la desnaturalización inducida por el calor y la urea, con D6 mostrando el efecto estabilizador más significativo.
Conclusiones:
- La aglomeración macromolecular influye profundamente en las características estructurales, la estabilidad y las características de unión de carbohidratos de la jacalina.
- El tamaño de los crowders juega un papel crítico en la modulación de estos efectos.
- Estos hallazgos proporcionan información sobre el comportamiento de la lectina en sistemas biológicos complejos y posibles aplicaciones terapéuticas.
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