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Un homólogo humano del receptor HDEL de la levadura
1MRC Laboratory of Molecular Biology, Cambridge, UK.
Nature
|November 8, 1990
Resumen
Las proteínas residentes se retienen en el retículo endoplasmático a través de la recuperación del cis-Golgi. Las células humanas poseen un receptor KDEL similar a la levadura, lo que sugiere mecanismos de recuperación conservados.
Área de la Ciencia:
- Biología celular Biología celular.
- Biología Molecular Biología Molecular
- Tráfico de proteínas El tráfico de proteínas.
Sus antecedentes:
- Las proteínas residentes en el lumen del retículo endoplasmático (ER) se recuperan de los compartimentos cis-Golgi o pre-Golgi.
- Esta recuperación está mediada por las señales tetrapeptídicas C-terminales: Lys-Asp-Glu-Leu (KDEL) en las células animales y His-Asp-Glu-Leu (HDEL) en la levadura.
- Se cree que el gen ERD2 de la levadura codifica el receptor de clasificación HDEL, una proteína de membrana integral de 26K no glicosilada.
Objetivo del estudio:
- Para investigar la naturaleza del receptor KDEL en las células humanas.
- Para determinar si el mecanismo de recuperación de KDEL se conserva entre las células de levadura y las células humanas.
- Desafiar el modelo propuesto de un receptor KDEL divergente en células de mamíferos.
Principales métodos:
- Caracterización de una proteína humana homóloga al producto del gen ERD2 de la levadura.
- Análisis de la secuencia de proteínas, tamaño y propiedades.
- Comparación con los datos existentes sobre los receptores KDEL de mamíferos.
Principales resultados:
- Las células humanas expresan una proteína que es similar en secuencia, tamaño y propiedades al producto del gen ERD2 de la levadura.
- Se propone que esta proteína humana sea el receptor KDEL.
- Los hallazgos sugieren la conservación del mecanismo de recuperación de KDEL en todas las especies.
Conclusiones:
- El receptor KDEL en las células humanas comparte similitudes significativas con su contraparte de la levadura.
- Esto indica un mecanismo molecular conservado para la recuperación de proteínas ER.
- El modelo de receptor KDEL de mamíferos divergentes sugerido anteriormente puede requerir una reevaluación.
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