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La flexibilidad estructural electrónica de los cofactores heterobimetálicos Mn/Fe: las proteínas R2lox y R2c
Hannah S Shafaat1, Julia J Griese, Dimitrios A Pantazis
1Max-Planck-Institut für Chemische Energiekonversion , Stiftstrasse 34-36, Mülheim an der Ruhr D-45470, Germany.
Los investigadores estudiaron el cofactor Mn/Fe en las oxidasas de R2lox, encontrándolo fotoactivo. La exposición a la luz altera el ion Mn (III)
Área de la Ciencia:
- La bioquímica es la bioquímica.
- Química bioorgánica Química bioorgánica.
- La espectroscopia es una técnica de espectroscopia.
Sus antecedentes:
- Las oxidasas R2lox contienen un nuevo cofactor Mn/Fe.
- R2lox comparte homología con la ribonucleótido reductasa R2c, pero tiene funciones distintas.
Objetivo del estudio:
- Para dilucidar la estructura electrónica del cofactor Mn/Fe en R2lox.
- Para investigar la fotoactividad y los cambios estructurales del cofactor R2lox.
Principales métodos:
- Resonancia Paramagnética Electrónica de Multifrecuencia (EPR, por sus siglas en inglés) y técnicas de pulso.
- Cálculos de la Teoría Funcional de la Densidad (DFT).
Principales resultados:
- El cofactor R2lox es un dimero antiferromagnético acoplado Mn (III) /Fe (III).
- La fotoactivación a 77 K forma un estado R2loxPhoto inestable.
- Los cambios en la geometría del sitio Mn(III) y el estado electrónico, evidenciados por la reorientación del eje hiperfino, se desencadenan por la desprotonación del puente μ-hidroxo.
Conclusiones:
- El cofactor R2lox exhibe fotoactividad, experimentando cambios estructurales al iluminarse.
- Estos hallazgos tienen un impacto en la comprensión del cofactor R2c relacionado y las funciones divergentes de R2lox y R2c.
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