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A Protocol for Computer-Based Protein Structure and Function Prediction
Published on: November 3, 2011
La estructura tridimensional del complejo humano TFIID-IIA-IIB
F Andel1, A G Ladurner, C Inouye
1Life Science Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.
Science (New York, N.Y.)
|December 11, 1999
Resumen
Los investigadores visualizaron la estructura del factor de transcripción humano IID (TFIID) y su complejo con TFIIA y TFIIB. Esto revela el complejo TFIID-IIA-IIB.
Área de la Ciencia:
- Biología Molecular Biología Molecular
- Biología Estructural Biología estructural.
- La bioquímica es la bioquímica.
Sus antecedentes:
- El factor de transcripción IID (TFIID) es crucial para la iniciación de la transcripción de la ARN polimerasa II en los eucariotas.
- TFIID interactúa con TFIIA y TFIIB para formar complejos de preiniciación en los promotores centrales.
Objetivo del estudio:
- Para determinar la estructura de alta resolución del TFIID humano y el complejo TFIID-TFIIA-TFIIB.
- Para dilucidar la disposición espacial de estos factores de transcripción dentro del complejo de iniciación.
Principales métodos:
- Microscopía electrónica (EM) para la determinación estructural.
- Técnicas de análisis de imágenes para lograr una resolución de 35 angstroms.
- Estudios de anticuerpos para la localización de proteínas dentro del complejo.
Principales resultados:
- El TFIID humano exhibe una estructura trilobada en forma de herradura.
- TFIIA y TFIIB se unen a lóbulos opuestos de TFIID, flanqueando una cavidad central.
- La proteína de unión a TATA (TBP) se encuentra en el centro, entre TFIIA y TFIIB, dentro de la cavidad probablemente involucrada en la unión al ADN TATA.
Conclusiones:
- El estudio proporciona un modelo estructural detallado del complejo TFIID-TFIIA-TFIIB.
- Esta información estructural aclara la organización de los componentes clave involucrados en la iniciación de la transcripción eucariota.
- Los hallazgos ofrecen información sobre el mecanismo de reconocimiento del ADN TATA por la maquinaria de transcripción.
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