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Mn(II) Enlace y subsiguiente oxidación por la Multicopper Oxidase MnxG Investigada por Espectroscopia de Resonancia

Lizhi Tao, Troy A Stich, Cristina N Butterfield¹

¹Division of Environmental and Biomolecular Systems, Institute of Environmental Health, Oregon Health & Science University , Portland, Oregon 97239, United States.

Journal of the American Chemical Society

|August 6, 2015

Resumen

El complejo proteico Mnx oxida rápidamente el manganeso, formando óxidos de manganeso (MnOx) a través de un proceso de dos fases. Este estudio revela las especies clave de manganeso implicadas en la mineralización del manganeso.

Área de la Ciencia:

La bioquímica
La biomineralización
Espectroscopia

Sus antecedentes:

Las oxidasas multicobre (MCO) juegan un papel crucial en varios procesos biológicos, incluida la oxidación y mineralización de metales.
Los óxidos de manganeso (MnOx) son importantes en los sistemas ambientales y biológicos, pero sus mecanismos de formación no se comprenden completamente.
El complejo proteico Mnx, que contiene MCO, está implicado en la biomineralización del manganeso.

Objetivo del estudio:

Para investigar la dinámica de la formación sólida de manganeso por el complejo de proteínas Mnx.
Para aclarar el mecanismo molecular de la mineralización del manganeso mediada por Mnx.
Identificar y caracterizar las especies de manganeso durante el proceso de oxidación.

Principales métodos:

Se empleó la espectroscopia de resonancia paramagnética de electrones (EPR), incluida la de onda continua (CW) y la EPR de pulso.
Se realizó un análisis cinético utilizando cinética de pseudo-primer orden de dos fases.
Se llevó a cabo la caracterización espectroscópica de las especies que contienen manganeso en las mezclas de reacción.

Principales resultados:

Se observó una rápida oxidación del sustrato de manganeso por Mnx, siguiendo una cinética de dos fases de pseudo-primer orden con coeficientes de velocidad determinados.
La tasa de oxidación del manganeso observada es comparable a la formación de MnOx in vitro.
Se encontraron pruebas de tres especies distintas de Mn ((II): acuosa, específicamente unida mononuclear y débilmente acoplada dimérica.

Conclusiones:

El complejo proteico Mnx cataliza eficientemente la oxidación y la mineralización del manganeso.
El estudio proporciona información a nivel molecular sobre el mecanismo de la biomineralización del manganeso.
Comprender estas dinámicas es crucial para las aplicaciones en remediación ambiental y biomateriales.

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