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Bead Aggregation Assays for the Characterization of Putative Cell Adhesion Molecules
Published on: October 17, 2014
Las interacciones dinámicas y estáticas entre la catenina p120 y la E-cadherina regulan la estabilidad de la adhesión
Noboru Ishiyama1, Seung-Hye Lee, Shuang Liu
1Division of Signaling Biology, Ontario Cancer Institute, ON, Canada.
Cell
|April 8, 2010
Resumen
p120 la catenina (p120) que se une a la E-caderina por su
Área de la Ciencia:
- La adhesión celular de las células.
- Biología molecular La biología molecular.
- Biología estructural Biología estructural.
Sus antecedentes:
- Los complejos de cadherina-catenina son vitales para la estabilidad de la adhesión celular.
- La asociación de la catenina p120 (p120) con el dominio de la membrana justa de la cadherina (JMD) es crítica para esta estabilidad.
- Comprender esta interacción es clave para descifrar los procesos celulares como el desarrollo de las sinapsis.
Objetivo del estudio:
- Para aclarar la base estructural de la unión de p120 a la E-cadherina JMD.
- Investigar las consecuencias funcionales de interrumpir esta interacción en la adhesión celular y la morfogénesis neuronal.
- Para entender cómo la p120 regula la estabilidad de la cadherina a través de distintos sitios de unión.
Principales métodos:
- Cristalografía de rayos X para determinar la estructura de la isoforma p120 4A unida a la E-cadherina JMD (núcleo).
- Mutagénesis dirigida al sitio para alterar los sitios de unión de p120 y evaluar los efectos sobre la interacción de la cadherina in vitro y en las células.
- Espectroscopia de Resonancia Magnética Nuclear (RMN) para estudiar las interacciones y dinámicas de p120-JMD.
- Ensayos celulares para evaluar el papel de las mutaciones p120 en la morfogénesis de la columna vertebral dendrítica neuronal.
Principales resultados:
- La estructura cristalina revela bolsas de unión modulares en p120 que son complementarias al núcleo de la E-cadherina JMD.
- Las mutaciones específicas de p120 interrumpieron la unión a la E-cadherina y la N-cadherina, lo que afectó la adhesión celular.
- Estas mutaciones permitieron la diferenciación de las etapas dependientes y independientes de la N-cadherina en la morfogénesis de la columna dendrítica.
- Los estudios de RMN indicaron que p120 se asocia con el DMJ, influyendo en los sitios de endocitosis y ubiquitinación.
Conclusiones:
- La catenina p120 estabiliza la adhesión célula-célula mediada por cadherina a través de interacciones específicas con el JMD.
- Los sitios de unión de p120 regulan la estabilidad de la cadherina protegiendo los residuos críticos involucrados en la endocitosis y la ubiquitinación.
- La interrupción de la interacción p120-cadherina proporciona información sobre los mecanismos moleculares del desarrollo de las sinapsis.
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