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In vivo and in vitro Studies of Adaptor-clathrin Interaction
Published on: January 26, 2011
El destino subcelular de la oncoproteína int-2 está determinado por la elección del codón de iniciación
Nature
|February 15, 1990
Resumen
Los factores de crecimiento de los fibroblastos (FGF) influyen en el crecimiento y la diferenciación celular. Este estudio identifica una nueva forma de proteína Int-2 extendida, que revela una doble localización y funciones celulares distintas.
Área de la Ciencia:
- Biología Molecular Biología Molecular
- Biología celular Biología celular.
- Oncología Oncología.
Sus antecedentes:
- Los factores de crecimiento de los fibroblastos (FGF) juegan un papel crítico en el crecimiento y la diferenciación celular.
- El gen int-2 del ratón, un miembro de la familia FGF, está involucrado en el desarrollo embrionario y el cáncer.
- Estudios previos identificaron múltiples clases de ARN mensajero int-2 que codifican una proteína de 245 aminoácidos.
Objetivo del estudio:
- Para investigar la iniciación alternativa de la traducción del gen int-2.
- Para caracterizar un nuevo producto de proteína Int-2 N-terminalmente extendido.
- Determinar la localización subcelular y las implicaciones funcionales de las diferentes formas de Int-2.
Principales métodos:
- Transfección transitoria de las células COS-1 con ADNs complementarios int-2.
- Análisis de productos proteicos iniciados a partir de codones AUG y CUG.
- Estudios de localización subcelular utilizando inmunofluorescencia o fraccionamiento celular.
Principales resultados:
- Identificación de una proteína Int-2 adicional N-terminalmente extendida iniciada en un codón CUG en el marco.
- El producto Int-2 iniciado por AUG está localizado principalmente en la vía secretora.
- El producto Int-2 iniciado por CUG está específicamente localizado en el núcleo.
Conclusiones:
- La oncoproteína Int-2 se puede producir en al menos dos formas distintas.
- Estas diferentes formas de Int-2 exhiben localizaciones subcelulares distintas (vía secretora frente al núcleo).
- La doble localización sugiere que la oncoproteína Int-2 puede ejercer su influencia a través de dos mecanismos separados, impactando el comportamiento celular de manera diferente.
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