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Assaying Proteasomal Degradation in a Cell-free System in Plants
Published on: March 27, 2014
Regulación temporal de la función del efector de virulencia de la salmonela por la degradación proteica dependiente
1Section of Microbial Pathogenesis, Yale University School of Medicine, New Haven, CT 06536, USA.
Cell
|November 26, 2003
Resumen
La invasión de Salmonella se basa en las proteínas bacterianas SopE y SptP, que regulan las GTPasas de las células huésped. Las tasas de degradación de las proteínas, controladas por los dominios de secreción, dictan la dinámica de la infección.
Área de la Ciencia:
- Microbiología Microbiología.
- Biología celular Biología celular.
- Biología Molecular Biología Molecular
Sus antecedentes:
- La infección por Salmonella enterica implica la invasión de la célula huésped mediada por las proteínas efectoras bacterianas.
- Las GTPasas de la familia Rho, Cdc42 y Rac1, son cruciales para la manipulación de las células huésped durante la infección por Salmonella.
- Las GEF bacterianas (SopE) y las GAP (SptP) controlan la actividad de la GTPasa, pero su regulación diferencial no se entiende completamente.
Objetivo del estudio:
- Investigar los mecanismos regulatorios que rigen la estabilidad y la función de las proteínas efectoras de Salmonella SopE y SptP.
- Determinar cómo los dominios de secreción y translocación influyen en la cinética de degradación de SopE y SptP.
- Para dilucidar el papel de las semividas de las proteínas diferenciales en las interacciones de las células huésped de Salmonella.
Principales métodos:
- Análisis comparativo de las tasas de degradación de SopE y SptP en las células huésped.
- Análisis de degradación mediada por proteasomas. ensayos de degradación mediados por proteasomas.
- Construcción de proteínas quiméricas utilizando los dominios de secreción y translocación de SopE y SptP.
- Análisis de las reorganizaciones del citoesqueleto de actina.
Principales resultados:
- SopE y SptP son entregados en cantidades iguales por Salmonella, pero SopE sufre una rápida degradación proteasomal, mientras que SptP se degrada lentamente.
- Los dominios de secreción y translocación influyen significativamente en las vidas medias de SopE y SptP.
- El intercambio de dominios entre SopE y SptP alteró sus tasas de degradación y afectó la dinámica de la actina de la célula huésped.
Conclusiones:
- Salmonella emplea la degradación diferencial de proteínas de SopE y SptP, regulada por sus dominios de secreción / translocación, para controlar las GTPasas de las células huésped.
- Este mecanismo permite a la Salmonella modular con precisión las funciones de las células huésped, como las reorganizaciones del citoesqueleto de actina, durante la infección.
- El estudio pone de relieve una sofisticada estrategia de adaptación bacteriana para las interacciones patógeno-huésped.
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