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Estructura cristalina de un dominio de autoprocesamiento de Hedgehog: homología entre Hedgehog y las proteínas de
T M Hall1, J A Porter, K E Young
1Department of Biophysics and Biophysical Chemistry, Johns Hopkins University School of Medicine, Baltimore, Maryland 21205, USA.
Cell
|October 23, 1997
Resumen
El dominio carboxi-terminal de la proteína del erizo de Drosophila (Hh-C) se somete a un proceso de autoprocesamiento. Su estructura cristalina revela subdominios homólogos, ofreciendo información sobre la evolución de la proteína Hedgehog y la conservación de la inteína.
Área de la Ciencia:
- Biología Molecular Biología Molecular
- Biología Estructural Biología estructural.
- Biología evolutiva Biología evolutiva.
Sus antecedentes:
- El dominio carboxi-terminal de la proteína Drosophila Hedgehog (Hh-C) exhibe actividad de autoprocesamiento, crucial para generar la forma de señalización activa.
- Este proceso implica la escisión intramolecular y la fijación del colesterol al fragmento amino-terminal.
Objetivo del estudio:
- Para determinar la estructura cristalina del fragmento activo de 17 kDa de Hh-C (Hh-C17).
- Para identificar los residuos clave en el sitio activo de Hh-C17 y aclarar su papel en el autoprocesamiento.
- Para explorar las relaciones evolutivas entre Hh-C e inteins.
Principales métodos:
- Purificación y cristalización del fragmento Hh-C17.
- Cristalografía de rayos X para determinar la estructura 3D de Hh-C17.
- Mutagénesis dirigida al sitio para sondear la función de los residuos del sitio activo.
Principales resultados:
- Se determinó la estructura cristalina de Hh-C17, revelando dos subdominios homólogos que probablemente se originaron a partir de la duplicación de genes.
- Se identificaron los principales residuos del sitio activo involucrados en el autoprocesamiento de Hedgehog.
- Las características conservadas entre Hh-C17 e inteínas sugieren un origen evolutivo compartido.
Conclusiones:
- La estructura de Hh-C17 proporciona una base molecular para comprender el autoprocesamiento del erizo.
- Los hallazgos sugieren un vínculo evolutivo plausible entre los dominios de la proteína Hedgehog y los inteínos.
- Este estudio ofrece información sobre la evolución de los mecanismos de empalme de proteínas.
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