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Bases estructurales del reclutamiento dependiente del ARN de la glutamina en el código genético
Hiroyuki Oshikane1, Kelly Sheppard, Shuya Fukai
1Department of Biological Information, Graduate School of Bioscience and Biotechnology, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama-shi, Kanagawa 226-8501, Japan.
Science (New York, N.Y.)
|July 1, 2006
Resumen
Las arqueas usan la enzima GatDE para amidar el glutamil-tRNA (Gln) en glutaminyl-tRNA (Gln) para la síntesis de proteínas. La estructura cristalina revela un canal de amoníaco y sugiere el reconocimiento de tRNA a través de la forma, no sólo el anticodón, en este vital proceso de código genético.
Área de la Ciencia:
- La bioquímica es la bioquímica.
- Biología Estructural Biología estructural.
- Genética molecular La genética molecular.
Sus antecedentes:
- El ARN glutaminyl-transfer (Gln-tRNA ((Gln)) es esencial para la síntesis de proteínas en las arqueas.
- Este Gln-tRNA ((Gln) se sintetiza a través de la amidación pretranslacional del Glu-tRNA ((Gln) mal acilado por la Glu-tRNA ((Gln) amidotransferasa (GatDE).
Objetivo del estudio:
- Para aclarar la base estructural de GatDE mediada por Gln-tRNA (Gln) síntesis.
- Caracterizar los mecanismos catalíticos y las estrategias de reconocimiento de tRNA de GatDE.
Principales métodos:
- Se utilizó la cristalografía de rayos X para determinar la estructura del Methanothermobacter thermautotrophicus GatDE complejado al tRNA (Gln) a una resolución de 3,15 angstroms.
- Se realizaron análisis bioquímicos en mutantes de GatDE y tRNA para caracterizar la actividad enzimática.
Principales resultados:
- La estructura cristalina reveló un canal de 40 angstroms de largo para el transporte de amoníaco que conecta los sitios activos de GatD y GatE.
- El análisis bioquímico identificó los centros catalíticos para las actividades de la glutaminasa, la quinasa y la amidotransferasa.
- tRNA ((Gln) reconocimiento parece estar mediado por la lectura indirecta, que implica la complementariedad de la forma del bucle D.
Conclusiones:
- Los hallazgos sugieren un mecanismo basado en ARN temprano, independiente del anticodón, para incorporar la glutamina en el código genético.
- El canal de amoníaco identificado destaca una característica clave para una función enzimática eficiente en la síntesis de Gln-tRNA.
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