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Descubrimiento bioinformático de una monooxigenasa cambialista

Chang Liu¹, Magan M Powell¹, Guodong Rao²

¹Department of Chemistry, University of California, Berkeley, Berkeley, California 94720, United States.

Journal of the American Chemical Society

|January 10, 2024

Resumen

Los investigadores descubrieron una nueva monooxigenasa dinuclear que utiliza un cofactor manganeso-hierro para la hidroxilación del enlace C-H. Este hallazgo sugiere que otras monooxigenasas dinucleares también pueden utilizar cofactores metálicos variables.

Área de la Ciencia:

La bioquímica
Enzimología
Química bioorgánica

Sus antecedentes:

Las monooxigenasas dinucleares son cruciales para la oxidación del enlace C-H en los sistemas biológicos.
A menudo se supone que estas enzimas utilizan exclusivamente cofactores de diironio.

Objetivo del estudio:

Descubrir y caracterizar bioinformáticamente una nueva monooxigenasa dinuclear huérfana.
Investigar la preferencia por los cofactores y la actividad catalítica de esta enzima recién identificada.

Principales métodos:

Análisis bioinformático para identificar nuevas enzimas.
Ensayos bioquímicos para determinar la utilización del cofactor y la actividad enzimática.
Comparación con enzimas estructuralmente relacionadas como AibH2.

Principales resultados:

Descubrimiento de una monooxigenasa dinuclear huérfana que utiliza preferentemente un cofactor heterometálico manganeso-hierro (Mn/Fe).
La enzima cataliza la hidroxilación del enlace C-H dependiente del O2.
La forma diirónica de la enzima (SfbO) muestra actividad enzimática limitada en comparación con su forma Mn/Fe.

Conclusiones:

Este estudio revela una nueva monooxigenasa dinuclear dependiente de Mn/Fe.
Los hallazgos desafían la suposición de la utilización exclusiva del cofactor de di-hierro en las monooxigenasas dinucleares.
Se propone que muchas otras monooxigenasas dinucleares pueden acomodar cofactores metálicos variables.

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