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La proteína de adherencia celular del reovirus posee dos dominios de trimización independientemente activos: base de
1Department of Microbiology and Infectious Diseases, University of Calgary Health Sciences Center, Alberta, Canada.
Cell
|October 30, 1992
Resumen
El ensamblaje de proteínas del Reovirus sigma 1 involucra dominios N- y C-terminales independientes. El N-terminal inicia la trimerización, facilitando el plegamiento cooperativo de los dominios C-terminales para la fijación celular.
Área de la Ciencia:
- Virología Virología.
- Biología Estructural Biología estructural.
- Bioquímica de las proteínas Bioquímica de las proteínas
Sus antecedentes:
- La proteína sigma 1 de adherencia celular del reovirus es crucial para la entrada del virus.
- Sigma 1 es un homotrimero con distintivos dominios de cola fibrosa N-terminal y cabeza globular C-terminal.
Objetivo del estudio:
- Para dilucidar los mecanismos independientes de plegamiento y trimización de los dominios de proteínas sigma 1 del reovirus.
- Para investigar el proceso de ensamblaje secuencial del sigma 1 homotrimer.
Principales métodos:
- Co-traducción in vitro de proteínas sigma 1 de longitud completa y truncadas.
- Pruebas de sensibilidad a la proteasa para controlar el plegamiento y la estabilidad de las proteínas.
Principales resultados:
- Las mitades terminales N y C de sigma 1 poseen capacidades independientes de trimización y plegado.
- La trimización del N-terminal forma una bobina enrollada sensible a la proteasa, promoviendo el plegamiento del C-terminal.
- La fibra N-terminal madura en una estructura estable y resistente a la proteasa de forma independiente.
Conclusiones:
- El ensamblaje Sigma 1 es un proceso coordinado que involucra funciones de dominio independientes.
- Este mecanismo pone de relieve los efectos negativos dominantes de las subunidades mutantes en los complejos proteicos oligoméricos.
- Comprender el ensamblaje sigma 1 proporciona información sobre los mecanismos de adherencia y entrada de virus.
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