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Biosíntesis de salinosporamidas a partir de ácidos grasos alfa, beta insaturados: implicaciones para extender la

Yuan Liu¹, Christopher Hazzard, Alessandra S Eustáquio

¹Scripps Institution of Oceanography, University of California at San Diego, La Jolla, California 92093-0204, USA.

Journal of the American Chemical Society

|July 16, 2009

Resumen

Los investigadores descubrieron nuevas unidades extensoras de la coenzima A en bacterias marinas, cruciales para la síntesis de fármacos anticancerígenos salinosporamida. La enzima SalG muestra flexibilidad en el procesamiento de sustratos, influyendo en la estructura del fármaco.

Área de la Ciencia:

Microbiología marina microbiología marina.
Biosíntesis de productos naturales en la biosíntesis de productos naturales.
Descubrimiento de fármacos.

Sus antecedentes:

Las salinosporamidas son potentes agentes anticancerígenos derivados de bacterias marinas.
Las policetidas sintasas (PKS) son enzimas clave en la biosíntesis de productos naturales complejos como las salinosporamidas.
Comprender las unidades extensoras específicas de PKS y las enzimas involucradas es crucial para dilucidar las vías biosintéticas y permitir enfoques de biología sintética.

Objetivo del estudio:

Identificar y caracterizar las nuevas unidades extensoras de la coenzima A-tethered polyketide synthase involucradas en la biosíntesis de salinosporamida.
Para investigar la especificidad del sustrato de la enzima crotonyl-CoA reductasa/carboxilasa, SalG.
Comprender cómo las variaciones en las unidades extensoras y la actividad enzimática contribuyen a la diversidad estructural de las salinosporamidas.

Principales métodos:

Aislamiento y caracterización de unidades extensoras de policetida sintasa de *Salinispora tropica*.
Estudios in vivo que involucran la manipulación genética de *Salinispora tropica*.
Ensayos enzimáticos in vitro utilizando la enzima SalG purificada con varios sustratos de 2-alquenil-CoA.

Principales resultados:

Descubrimiento de una nueva serie de unidades extensoras de la sintasa policetídica atadas a la coenzima A.
Demostración de que la crotonyl-CoA reductasa/carboxilasa SalG exhibe una amplia tolerancia al sustrato.
Identificación de sustratos específicos de 2-alquenil-CoA que conducen al patrón de sustitución C-2 de la salinosporamida.

Conclusiones:

Las unidades extensoras identificadas son componentes integrales en la biosíntesis de las salinosporamidas.
La amplia tolerancia al sustrato de SalG permite la generación de diversidad estructural en las salinosporamidas.
Esta investigación proporciona información sobre la maquinaria PKS responsable de la producción de salinosporamida y ofrece objetivos potenciales para el desarrollo de fármacos.

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