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La estructura cristalina de la halogenasa de hierro no hemo SyrB2 en la biosíntesis de la siringomicina
Leah C Blasiak1, Frédéric H Vaillancourt, Christopher T Walsh
1Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
Nature
|March 17, 2006
Resumen
Los investigadores descubrieron una nueva coordinación del hierro en SyrB2, una enzima clave en la biosíntesis de productos naturales. Este hallazgo revela un reemplazo único de iones cloruro de un ligando carboxilato en el hierro.
Área de la Ciencia:
- La bioquímica es la bioquímica.
- Biología Estructural Biología estructural.
- Enzimología Enzimología.
Sus antecedentes:
- Las enzimas no-hemicas Fe (II) / alfa-cetoglutarato (alphaKG) dependientes son cruciales para varios procesos biológicos, incluida la biosíntesis de productos naturales, la reparación del ADN y la respuesta hipóxica.
- Estas enzimas suelen catalizar reacciones oxidativas, como la hidroxilación, acoplando la descarboxilación de alphaKG con la formación de intermedios ferril-oxo.
- Las enzimas de hierro mononucleares estructuralmente caracterizadas tradicionalmente presentan una tríada facial 2-His, 1-carboxilato para la coordinación del hierro.
Objetivo del estudio:
- Para aclarar la estructura de SyrB2, una halogenasa no hemo Fe ((II) / alfaKG dependiente involucrada en la biosíntesis de la siringomicina E.
- Investigar el entorno de coordinación del hierro en SyrB2, particularmente en el contexto de su actividad halogenasa.
- Para caracterizar la interacción de alphaKG y un ion cloruro con el centro de hierro en SyrB2.2.
Principales métodos:
- Se empleó cristalografía de rayos X para determinar la estructura de SyrB2.2.
- La estructura se resolvió a una resolución de 1,6 Å.
- El estudio involucró la co-cristalización de SyrB2 con alfa-cetoglutarato y un ion cloruro.
Principales resultados:
- La estructura cristalina de SyrB2 reveló un nuevo motivo de coordinación del hierro.
- Se observó que un ion cloruro estaba coordinado con el ion hierro, reemplazando el ligando carboxilato típico de la tríada facial.
- La estructura también mostró alfa-cetoglutarato coordinado con el ion hierro.
Conclusiones:
- El estudio identificó una coordinación de hierro previamente desconocida en las enzimas de hierro mononuclear, donde el cloruro reemplaza a un ligando carboxilato.
- Este hallazgo amplía nuestra comprensión de la diversidad estructural y los mecanismos catalíticos de las enzimas no dependientes de Fe ((II) / alphaKG no-hem.
- La coordinación única en SyrB2 es crucial para su función como halogenasa, catalizando la cloración de la threonina.
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