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La inhibición de la miosina quinasa de cadena ligera por la quinasa activada por p21 por la p21
L C Sanders1, F Matsumura, G M Bokoch
1Departments of Immunology and Cell Biology, The Scripps Research Institute, La Jolla, CA 92037, USA.
Science (New York, N.Y.)
|March 26, 1999
Resumen
Las quinasas activadas por p21 (PAKs) se dirigen a la miosina de la cadena ligera de la quinasa (MLCK), disminuyendo su actividad y la fosforilación de la cadena ligera de la miosina. Este mecanismo regula la dinámica citoesquelética y la propagación celular.
Área de la Ciencia:
- Biología celular Biología celular.
- Biología Molecular Biología Molecular
- La bioquímica es la bioquímica.
Sus antecedentes:
- Las quinasas activadas por p21 (PAK) son reguladores clave de la dinámica citoesquelética, influenciadas por las Rho GTPasas.
- La dinámica citoesquelética se basa en las interacciones de actina y miosina II, moduladas por la fosforilación de la cadena ligera de miosina (MLC) mediada por la miosina quinasa de cadena ligera (MLCK).
Objetivo del estudio:
- Para investigar el papel de la quinasa 1 activada por p21 (PAK1) en la regulación de la actividad de la miosina en la cadena ligera de la quinasa (MLCK).
- Para determinar si los PAK modulan la dinámica citoesquelética a través de la fosforilación de MLCK.
Principales métodos:
- Expresión de PAK1 constitutivamente activo en el riñón-21 y las células HeLa del bebé hámster.
- Prueba para medir la actividad de MLCK y los niveles de fosforilación de MLC.
- Evaluación de la propagación celular como indicador de la dinámica citoesquelética.
Principales resultados:
- Se encontró que PAK1 fosforila el MLCK, lo que lleva a una reducción de la actividad del MLCK.
- Se observó una disminución de la actividad de MLCK y la fosforilación de MLC en células que expresan PAK1.1. activo.
- Se observó inhibición de la propagación celular en células con expresión activa de PAK1.
Conclusiones:
- La miosina quinasa de cadena ligera (MLCK) es un objetivo directo de las quinasas activadas por p21 (PAK).
- Las PAK regulan la dinámica citosquelética inhibiendo la actividad de MLCK y la posterior fosforilación de MLC, lo que afecta la propagación celular.
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