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Formación de hidrocarburos halogenados de cadena media por una transformación mediada por lipoxigenasa/hidroperoxido
Thomas Wichard1, Georg Pohnert
1Institute of Chemical Sciences and Engineering, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland.
Journal of the American Chemical Society
|June 1, 2006
Resumen
Las diatomeas marinas como Stephanopyxis turris transforman rápidamente el ácido eicosapentaenoico. Este estudio revela una nueva vía enzimática que produce hidrocarburos clorados y un ácido oxo insaturado.
Área de la Ciencia:
- Biología marina Biología marina.
- La bioquímica es la bioquímica.
- Enzimología Enzimología.
Sus antecedentes:
- El metabolismo del ácido eicosapentaenoico en los organismos marinos no se entiende completamente.
- Las actividades conocidas de escisión de ácidos grasos no explican los productos observados.
Objetivo del estudio:
- Para dilucidar la vía bioquímica para la transformación del ácido eicosapentaenoico en la diatomea marina Stephanopyxis turris.
- Para identificar las enzimas involucradas en la producción de hidrocarburos clorados y ácidos oxo insaturados.
Principales métodos:
- Uso de precursores etiquetados para rastrear las vías metabólicas.
- Experimentos de atrapamiento para aislar productos intermedios.
- Inhibición selectiva de las actividades enzimáticas para identificar roles específicos.
Principales resultados:
- La desintegración de las células de Stephanopyxis turris transforma rápidamente el ácido eicosapentaenoico.
- Una nueva vía implica una lipoxigenasa que activa el ácido graso a un hidroperoxido.
- Una nueva haloliasa de hidroperoxido divide el hidroperoxido en hidrocarburos C8 clorados y un ácido oxo C12 insaturado.
Conclusiones:
- Se ha descubierto una nueva vía enzimática para la halogenación en la naturaleza.
- Esta vía contribuye a la bioquímica única de las diatomeas marinas.
- Los hallazgos amplían el repertorio conocido de actividades enzimáticas halogenantes.
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