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La formación de β-Lactam por una sintetasa de péptido no ribosomal durante la biosíntesis de antibióticos
Nicole M Gaudelli1, Darcie H Long1, Craig A Townsend1
1Department of Chemistry, Johns Hopkins University, Baltimore, Maryland 21218, USA.
Nature
|January 28, 2015
Resumen
Las sintetasas de péptidos no ribosómicos ensamblan péptidos y forman anillos críticos de beta-lactama en los antibióticos nocardicina. Este nuevo mecanismo difiere de otras vías de beta-lactama, ofreciendo nuevas posibilidades para péptidos de ingeniería.
Área de la Ciencia:
- La bioquímica es la bioquímica.
- Biosíntesis de Productos Naturales de Productos Naturales
- Enzimología Enzimología.
Sus antecedentes:
- Las sintetasas de péptidos no ribosómicos (NRPS) son enzimas grandes que sintetizan diversos péptidos bioactivos.
- Muchos productos naturales, incluidos los antibióticos como la vancomicina y la penicilina, se derivan de NRPS.
- Los anillos beta-lactámicos son motivos estructurales cruciales en muchos antibióticos.
Objetivo del estudio:
- Para investigar una nueva actividad de NRPS involucrada en la biosíntesis del antibiótico nocardicina.
- Para dilucidar el mecanismo de la formación de anillos de beta-lactama por NRPS.
- Explorar las aplicaciones potenciales de esta actividad de NRPS en la ingeniería de péptidos.
Principales métodos:
- Ensayos bioquímicos para estudiar la actividad de NRPS.
- Análisis de dominio enzimático. análisis de dominio enzimático.
- Estudios mecanicistas y validación experimental de apoyo.
Principales resultados:
- Descubrimiento de una actividad sin precedentes de NRPS que ensambla un péptido que contiene serina.
- Identificación de un dominio de condensación rico en histidina responsable de la síntesis de anillos de beta-lactama.
- Elucidación de un nuevo mecanismo para la formación de anillos beta-lactámicos distintos de las vías conocidas.
Conclusiones:
- Se ha identificado un nuevo mecanismo NRPS para la formación de anillos de beta-lactama en las nocardicinas.
- Este hallazgo amplía nuestra comprensión de las capacidades de NRPS y la biosíntesis de beta-lactama.
- La actividad de NRPS descubierta tiene potencial para la ingeniería de nuevos péptidos bioactivos e inhibidores de la proteasa.
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