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Updated: Sep 10, 2025

Measurement of Heme Synthesis Levels in Mammalian Cells

Measurement of Heme Synthesis Levels in Mammalian Cells

Published on: July 9, 2015

La asignación de hemo en las células eucariotas depende de la exportación de hemo mitocondrial a través de FLVCR1b al

Dhanya Thamaraparambil Jayaram¹, Pranav Sivaram¹, Pranjal Biswas¹

¹Department of Inflammation and Immunity, Cleveland Clinic Lerner College of Medicine of Case Western Reserve University School of Medicine, Cleveland, Cleveland, OH, USA.

Nature communications

|August 26, 2025

Resumen

La proteína de exportación de hemo mitocondrial FLVCR1b entrega el cofactor hemo esencial al GAPDH citosólico, lo que permite la distribución celular. Esta vía, que involucra a TANGO2, asegura que el hemo llegue a las hemoproteínas vitales para la función celular.

Área de la Ciencia:

Biología celular
La bioquímica
Biología molecular

Sus antecedentes:

El hemo es un cofactor crítico que contiene hierro sintetizado en las mitocondrias.
El hemo debe ser exportado de las mitocondrias para alcanzar los objetivos de proteínas citosólicas.
La gliceraldehído-3-fosfato deshidrogenasa (GAPDH) se une al hemo en el citosol, facilitando su distribución celular.

Objetivo del estudio:

Elucidar el mecanismo por el cual las mitocondrias suministran hemo al GAPDH citosólico.
Identificar las proteínas mitocondriales específicas involucradas en la exportación y entrega de hemo a la GAPDH.

Principales métodos:

Utilizó dos líneas celulares humanas y una proteína reportera GAPDH fluorescente.
Se han investigado las interacciones proteína-proteína entre FLVCR1b, TANGO2 y GAPDH.
Realizó experimentos con mitocondrias aisladas para estudiar la liberación de hemo.

Principales resultados:

La proteína mitocondrial FLVCR1b fue identificada como el proveedor de hemo a la GAPDH.
La asociación de FLVCR1b con GAPDH fluctuó, correlacionándose con la transferencia de hemo.
La ausencia de FLVCR1b interrumpió la asociación mitocondrial de GAPDH y la absorción de hemo por las hemoproteínas.
Se encontró que la proteína TANGO2 es necesaria para la adquisición de hemo GAPDH, interactuando con FLVCR1b.

Conclusiones:

FLVCR1b es la fuente primaria de hemo mitocondrial para GAPDH.
El complejo FLVCR1b-TANGO2 facilita la exportación de hemo desde las mitocondrias.
Esta vía es crucial para la entrega de hemo a GAPDH y otras hemoproteínas celulares, asegurando su correcto funcionamiento.

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