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Inusual enlace hemo-histidina en el sitio activo de una chaperona

Donghan Lee¹, Konstantin Pervushin, Daniela Bischof

¹Laboratory of Physical Chemistry and Institute of Microbiology, ETH Hönggerberg, CH-8093 Zürich, Switzerland.

Journal of the American Chemical Society

|March 18, 2005

Resumen

El chaperón hemo CcmE forma un enlace covalente único con el hemo, que involucra a la histidina H130.0. Esta nueva estructura del complejo heme-histidina fue esclarecida utilizando RMN, revelando un vínculo no descrito previamente en las hemoproteínas.

Área de la Ciencia:

La bioquímica es la bioquímica.
Biología Estructural Biología estructural.
Biología Molecular Biología Molecular

Sus antecedentes:

El chaperón hemo CcmE juega un papel crítico en la entrega de hemo a los citocromos tipo c.
Se sabe que CcmE forma un enlace covalente transitorio con el hemo que involucra un residuo específico de histidina.

Objetivo del estudio:

Determinar la estructura química precisa del nuevo enlace covalente formado entre CcmE y hemo.
Para caracterizar el complejo único de hemo-histidina formado por CcmE.

Principales métodos:

Se empleó la espectroscopia de Resonancia Magnética Nuclear (RMN) para resolver la estructura química del enlace.
Análisis estructural detallado del enlace cruzado hemo-histidina.

Principales resultados:

El estudio descubrió que el grupo vinilo hemo está reticulado en su carbono beta al átomo Ndelta1 de la histidina H130.0.
Esto representa un tipo de enlace covalente no descrito anteriormente entre el hemo y la histidina.
El vínculo identificado es un nuevo complejo heme-histidina, distinto de los que se encuentran en otros citocromos o hemoproteínas.

Conclusiones:

Se ha aclarado la estructura química del enlace covalente CcmE-hemo.
Este hallazgo revela un nuevo mecanismo de unión del hemo en las hemoproteínas.
El descubrimiento amplía nuestra comprensión de las interacciones hemo-histidina y la función CcmE.

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