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Dominio de formulación: una enzima modificadora esencial para la biosíntesis no ribosómica de la gramicidina lineal
Georg Schoenafinger1, Nadine Schracke, Uwe Linne
1Fachbereich Chemie/Biochemie, Philipps-Universität Marburg, Hans-Meerwein-Strasse, D-35032 Marburg, Germany.
Journal of the American Chemical Society
|June 8, 2006
Resumen
Este estudio revela que la N-formación es esencial para iniciar la biosíntesis de la gramicidina por la sintetasa de péptidos no ribosómicos LgrA1.1. El dominio de formulación transfiere un grupo formilo a la valina, creando una unidad de arranque necesaria para el alargamiento de la cadena peptídica.
Área de la Ciencia:
- La bioquímica es la bioquímica.
- Biología Molecular Biología Molecular
- Enzimología Enzimología.
Sus antecedentes:
- La N-formilación es un paso clave en la síntesis de péptidos ribosómicos procarióticos.
- La N-formalización es poco común y en gran medida inexplorada en la síntesis de péptidos no ribosómicos (NPS).
- Los pasos iniciales del sistema lineal de gramicidina sin peptido ribosómico sintetasa (LgrA) no fueron completamente comprendidos.
Objetivo del estudio:
- Para investigar la actividad de la formiltransferasa del módulo LgrA1.
- Para determinar si se requiere N-formilación para el inicio de la biosíntesis de gramicidina.
- Para identificar nuevas enzimas de adaptación en NPS.
Principales métodos:
- Ensayos in vitro del módulo LgrA1 para la actividad de la formiltransferasa.
- Prueba de transferencia del grupo formilo del formiltetrahidrofolato (fH4F) a la valina.
- Los ensayos de alargamiento utilizan un sistema LgrA bimodular con y sin donantes de grupos formilo.
Principales resultados:
- El supuesto dominio de formulación de LgrA1 transfirió con éxito grupos de formilo de N10- y N5-fH4F a la valina.
- Se confirmó que la formil-valina es la unidad de inicio esencial para la biosíntesis de la gramicidina.
- Los ensayos de alargamiento no mostraron formación de dipeptídeos sin el donante de formilo, pero se produjo formil-valil-glicina con él.
Conclusiones:
- El primer dominio de LgrA exhibe actividad de la formiltransferasa, confirmando su papel en el NPS.
- Este hallazgo identifica una nueva enzima de adaptación en la vía de síntesis de péptidos no ribosómicos.
- La N-formilación es un paso crítico, no reconocido previamente, en el inicio de la biosíntesis de la gramicidina.
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