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Measuring Protein Binding to F-actin by Co-sedimentation
Published on: May 18, 2017
Estructura terciaria de la destrina y similitud estructural entre dos familias de proteínas reguladoras de actina
H Hatanaka1, K Ogura, K Moriyama
1Tokyo Metropolitan Institute of Medical Science, Japan.
Cell
|June 28, 1996
Resumen
La destrina, una proteína que se une a la actina, comparte un nuevo pliegue con la familia de las gelsolinas. Su estructura única explica la unión de actina independiente del calcio y la ruptura del filamento dependiente del pH.
Área de la Ciencia:
- La bioquímica es la bioquímica.
- Biología Estructural Biología estructural.
- Biología celular Biología celular.
Sus antecedentes:
- Destrin es una isoproteína de la cofilina, crucial para regular el citoesqueleto de actina en los eucariotas.
- Comprender la estructura de la destrina es clave para dilucidar sus diversas funciones celulares.
Objetivo del estudio:
- Para determinar la estructura terciaria de las destrin.
- Investigar las bases estructurales de la interacción de la destrina con la actina y sus actividades celulares.
Principales métodos:
- Se empleó espectroscopia multidimensional de resonancia magnética nuclear (RMN) de triple resonancia para determinar la estructura terciaria de la destrina.
Principales resultados:
- Destrin exhibe un nuevo pliegue de proteínas, sorprendentemente similar a los segmentos de la familia de la gelsolina a pesar de la baja homología de secuencia.
- La hélice de unión a la actina de la destrina difiere de la de la gelsolina, lo que explica la unión a la actina independiente del calcio de la destrina.
- Las ideas estructurales sugieren mecanismos para la unión de actina sensible a la fosforilación, competitiva con los fosfoinosítidos, la ruptura del filamento dependiente del pH y la translocación nuclear inducida por el estrés con actina.
Conclusiones:
- Destrin representa un nuevo grupo de plegado de proteínas, distinto pero relacionado con la familia de las gelsolinas.
- La estructura determinada proporciona una base para comprender los mecanismos únicos de regulación de la actina de la destrina.
- Investigaciones adicionales pueden explorar los roles de la destrina en los procesos celulares bajo diversas condiciones basadas en sus propiedades estructurales.
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