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MARCKS es una proteína de enlace cruzado de filamento de actina regulada por la proteína quinasa C y la
J H Hartwig1, M Thelen, A Rosen
1Department of Medicine, Brigham and Women's Hospital, Boston, Massachusetts.
Nature
|April 16, 1992
Resumen
La proteína quinasa C (PKC) regula la forma de la célula al afectar la actina, una proteína clave del citoesqueleto. La proteína myristoylated, rica en alanina del sustrato de la cinasa C (MARCKS) enlaza PKC a la organización de la actina, con su actividad modulada por la fosforilación y la calmodulina.
Área de la Ciencia:
- Biología celular Biología celular.
- La bioquímica es la bioquímica.
- Biología Molecular Biología Molecular
Sus antecedentes:
- Los agonistas de la proteína quinasa C (PKC) alteran la morfología celular y la organización de la actina.
- El sustrato de C quinasa (MARCKS) miristoilado y rico en alanina es un sustrato específico de PKC involucrado en la motilidad celular.
- No se ha establecido un vínculo directo entre PKC y el ensamblaje de actina.
Objetivo del estudio:
- Investigar el papel de las MARCAS en la conexión de la señalización de PKC con la regulación del citoesqueleto de actina.
- Para determinar si MARCKS funciona como un puente entre PKC, calmodulina y actina.
Principales métodos:
- Ensayos bioquímicos para evaluar la actividad de enlace cruzado de F-actina de MARCOS.
- Investigando los efectos de la fosforilación mediada por PKC en la actividad de MARCKS.
- Examinando la influencia de la unión calcio-calmodulina en la función de las MARCAS.
Principales resultados:
- MARCKS fue identificado como una proteína de enlace cruzado de actina filamentosa (F).
- La fosforilación mediada por PKC inhibe la actividad de enlace cruzado de actina de MARCAS.
- La unión calcio-calmodulina también inhibe la actividad de enlace cruzado de actina de MARCKS.
Conclusiones:
- MARCKS actúa como un puente regulado entre la actina y la membrana plasmática.
- La modulación de la actividad de MARCKS por calmodulina y fosforilación integra las vías de señalización calcio-calmodulina y PKC.
- Esto proporciona un mecanismo para regular el citoesqueleto de actina en respuesta a las señales celulares.
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