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Adhesión celular. adhesión de las células. El complejo mínimo de cadherina-catenina se une a los filamentos de actina
Craig D Buckley1, Jiongyi Tan2, Karen L Anderson3
1Department of Chemical Engineering, Stanford University, Stanford, CA 94305, USA.
Science (New York, N.Y.)
|November 1, 2014
Resumen
El complejo adherens junction (AJ), que incluye la E-cadherina y las cateninas, se une a los filamentos de actina bajo fuerza, lo que explica la transducción mecánica de la fuerza en las uniones celulares. Este comportamiento de captura-enlace concilia los hallazgos in vivo e in vitro.
Área de la Ciencia:
- Biología celular Biología celular.
- La biofísica es la biofísica.
- La bioquímica es la bioquímica.
Sus antecedentes:
- Las uniones de adherencias (AJ) unen el citoesqueleto de actina, crucial para el desarrollo de los tejidos y la homeostasis.
- Los estudios in vivo sugieren que un complejo mínimo de cadherina-catenina se une a la actina filamentosa (F), pero los estudios in vitro no muestran ninguna unión en solución.
Objetivo del estudio:
- Para conciliar hallazgos contradictorios sobre la interacción del complejo cadherina-catenina con la F-actina.
- Para investigar las propiedades mecánicas de la interacción entre el filamento de actina y el complejo de cadherina-catenina.
Principales métodos:
- Utilizó un ensayo basado en trampa óptica para medir la interacción entre el complejo cadherina-catenina y F-actin.
- Analizó la cinética de disociación de enlaces bajo condiciones de fuerza variables.
Principales resultados:
- El complejo mínimo de cadherina-catenina forma enlaces estables con la F-actina específicamente bajo fuerza.
- La cinética de disociación de enlaces sigue un modelo de captura de enlaces, donde la fuerza aumenta la estabilidad de enlace.
- La fuerza cambia el complejo de un estado débil a un estado fuertemente unido con filamentos de actina.
Conclusiones:
- La unión dependiente de la fuerza explica cómo funciona el complejo cadherina-catenina en la transducción de fuerza mecánica en las uniones célula-célula.
- Este mecanismo de fijación de capturas proporciona una resolución a las discrepancias entre las observaciones in vivo e in vitro.
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