Vía no ribosómica codificada por animales hacia los análogos de la bursatelina
Aarthi Venugopalan1, Eric W Schmidt1
1Department of Medicinal Chemistry, University of Utah, Salt Lake City, Utah 84112, United States.
Journal of the American Chemical Society
|February 11, 2025
Resumen
Los moluscos marinos producen compuestos tóxicos de bursatelina-oxazinina a través de una nueva vía de biosíntesis animal. Este descubrimiento revela los moluscos
Área de la Ciencia:
- Química de los productos naturales marinos
- Bioquímica y genómica animal
- Biosíntesis de productos naturales
Sus antecedentes:
- Los compuestos de bursatelina-oxazinina son productos naturales marinos derivados de la tirosina que se encuentran en los moluscos.
- Estos compuestos se han relacionado con la toxicidad durante 40 años, pero su origen sigue siendo desconocido.
- Las investigaciones anteriores carecían de comprensión de las vías de biosíntesis en los moluscos.
Objetivo del estudio:
- Identificar el origen biosintético de los metabolitos de tipo bursatelina en los moluscos.
- Caracterizar bioquímicamente los genes involucrados en la vía de biosíntesis de la bursatelina.
- Investigar la importancia evolutiva y ecológica de estos compuestos en los moluscos.
Principales métodos:
- Análisis bioinformático de genomas y transcriptomas de moluscos para identificar grupos de genes.
- Caracterización bioquímica de las enzimas clave dentro de la vía identificada (bur-ox).
- Pruebas enzimáticas para elucidar los pasos de reducción y modificación en la síntesis de metabolitos.
Principales resultados:
- Descubrimiento de un nuevo grupo de genes biosintéticos de bursatelina (vía bur-ox) en moluscos.
- La evidencia bioquímica indica que los moluscos, no los simbiontes microbianos, producen estos compuestos.
- Caracterización de una sintetasa de péptido no ribosomal (NRPS) y una enzima aminocarboxipropiltransferasa (ACT) involucrada en los pasos sintéticos clave.
Conclusiones:
- Los moluscos poseen una vía única de NRPS de origen animal para sintetizar compuestos de tipo bursatelina.
- La amplia distribución de la vía bur-ox sugiere un origen común y un papel fisiológico para estos metabolitos.
- La presencia en bivalvos comestibles plantea dudas sobre la toxicidad de las oxazininas y pone de relieve la diversidad química animal.
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