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Spatiotemporal Analysis of Cytokinetic Events in Fission Yeast
Published on: February 20, 2017
El oscilador Min utiliza cambios conformacionales dependientes de MinD en MinE para regular espacialmente la
Kyung-Tae Park1, Wei Wu, Kevin P Battaile
1Department of Microbiology, Molecular Genetics and Immunology, University of Kansas Medical Center, Kansas City, KS 66160, USA.
Cell
|August 6, 2011
Resumen
La división celular bacteriana se basa en las proteínas MinD y MinE. Las mutaciones revelan cómo MinE cambia de forma, lo que permite a MinD reclutarlo para la formación adecuada de anillos Z y la división celular.
Área de la Ciencia:
- Biología celular Biología celular.
- Microbiología Microbiología.
- Biología Estructural Biología estructural.
Sus antecedentes:
- El sistema Min en E. coli regula la división celular a través de las oscilaciones de las proteínas MinD y MinE.
- El mecanismo preciso de interacción entre MinD y MinE no está claro debido a las regiones de MinE enmascaradas que vinculan a MinD.
- La estructura de MinE incluye regiones secuestradas de la hoja β y hélices N-terminales que se unen a la membrana.
Objetivo del estudio:
- Para aclarar la base estructural de la interacción MinD-MinE en E. coli.
- Para entender cómo las transiciones de MinE de un estado latente a un estado activo para la regulación del anillo Z.
Principales métodos:
- Aislamiento y caracterización de las mutaciones de minE que afectan la interacción MinD-MinE.
- Cristalización de los complejos MinD-MinE.
- Análisis estructural de las interacciones proteína-proteína.
Principales resultados:
- Se identificaron mutaciones minE específicas que restauran la interacción MinD-MinE.
- Estas mutaciones inducen cambios conformacionales en MinE, liberando sus regiones de unión a MinD.
- Las estructuras cristalinas muestran dímeros MinE con hebras β que se convierten en hélices α que se unen a dímeros MinD.
- Se propuso un modelo para la persistencia de MinE en la interfaz MinD-membrana.
Conclusiones:
- La unión MinD induce un cambio conformacional en MinE, convirtiéndolo de una forma latente a una activa.
- Esta transición estructural es crucial para la regulación espacial del anillo Z citokinético.
- Los hallazgos proporcionan información sobre el mecanismo de reclutamiento de MinE y su función en la división celular bacteriana.
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