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Bioinformatics Resources for the Study of Glycan-Mediated Protein Interactions
Published on: January 20, 2022
La flexibilidad de las proteínas y la entropía conformacional en el diseño de ligandos dirigidos al dominio de
Carl Diehl1, Olof Engström, Tamara Delaine
1Center for Molecular Protein Science, Biophysical Chemistry, Lund University, P.O. Box 124, SE-22100 Lund, Sweden.
Journal of the American Chemical Society
|September 30, 2010
Resumen
Este estudio revela que la entropía conformacional contribuye significativamente a la afinidad de unión de ligando en la galectina-3. Comprender estas dinámicas es crucial para avanzar en estrategias racionales de diseño de fármacos.
Área de la Ciencia:
- La bioquímica es la bioquímica.
- Biología Estructural Biología estructural.
- Diseño de drogas de diseño de drogas.
Sus antecedentes:
- El diseño racional de fármacos se basa en estructuras complejas proteína-ligando y termodinámica de unión.
- El papel de la entropía conformacional en la unión de ligandos a menudo se pasa por alto a pesar de su importancia.
Objetivo del estudio:
- Investigar la entropía conformacional y su contribución a la energía libre de unión al ligando para la galectina-3.
- Para caracterizar la unión de tres ligandos con diferentes afinidades.
Principales métodos:
- Espectroscopia de Resonancia Magnética Nuclear (RMN) ((15) Relajación de espín N y (2) H)
- Calorimetría de titulación isotérmica (ITC, por sus siglas en inglés)
- Cristalografía de rayos X de rayos X.
Principales resultados:
- La unión de ligandos induce fluctuaciones conformacionales diferenciales en la columna vertebral y las cadenas laterales de la proteína.
- Se observaron cambios en la flexibilidad dentro del núcleo hidrofóbico, con algunas regiones rigidificándose y otras volviéndose más flexibles.
- Se encontró que los cambios de entropía conformal eran comparables en magnitud a la entalpía de enlace, lo que indica una contribución favorable significativa.
Conclusiones:
- La entropía conformacional juega un papel crítico y favorable en la modulación de la afinidad de unión de ligando a la galectina-3.
- La intrincada interacción entre la estructura de la proteína y la dinámica ajusta la afinidad de unión.
- La presión evolutiva puede favorecer a las proteínas de unión de carbohidratos que utilizan la entropía conformacional para mejorar la afinidad, especialmente para las interacciones débiles.
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