The electron-bifurcating FeFe-hydrogenase Hnd is involved in ethanol metabolism in Desulfovibrio fructosovorans grown on pyruvate - Archive ouverte HAL Access content directly
Journal Articles Molecular Microbiology Year : 2022

The electron-bifurcating FeFe-hydrogenase Hnd is involved in ethanol metabolism in Desulfovibrio fructosovorans grown on pyruvate

Natalie Payne
  • Function : Author
  • PersonId : 1124770
Chloé Guendon
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  • PersonId : 1124771
Julien Ros
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  • PersonId : 1124772
Régine Lebrun
  • Function : Author
  • PersonId : 921883
Yann Denis
  • Function : Author
  • PersonId : 1124774

Abstract

Desulfovibrio fructosovorans, a sulfate-reducing bacterium, possesses six gene clusters encoding six hydrogenases catalyzing the reversible oxidation of H2 into protons and electrons. Among them, Hnd is an electron-bifurcating hydrogenase, coupling the exergonic reduction of NAD+ to the endergonic reduction of a ferredoxin with electrons derived from H2. It was previously hypothesized that its biological function involves the production of NADPH necessary for biosynthetic purposes. However, it was subsequently demonstrated that Hnd is instead a NAD+-reducing enzyme, thus its specific function has yet to be established. To understand the physiological role of Hnd in D. fructosovorans, we compared the hnd deletion mutant with the wild-type strain grown on pyruvate. Growth, metabolites production and comsumption, and gene expression were compared under three different growth conditions. Our results indicate that hnd is strongly regulated at the transcriptional level and that its deletion has a drastic effect on the expression of genes for two enzymes, an aldehyde ferredoxin oxidoreductase and an alcohol dehydrogenase. We demonstrated here that Hnd is involved in ethanol metabolism when bacteria grow fermentatively and proposed that Hnd might oxidize part of the H2 produced during fermentation generating both NADH and reduced ferredoxin for ethanol production via its electron bifurcation mechanism.
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Dates and versions

hal-03548887 , version 1 (31-01-2022)
hal-03548887 , version 2 (08-03-2022)

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Natalie Payne, Arlette Kpebe, Chloé Guendon, Carole Baffert, Julien Ros, et al.. The electron-bifurcating FeFe-hydrogenase Hnd is involved in ethanol metabolism in Desulfovibrio fructosovorans grown on pyruvate. Molecular Microbiology, 2022, ⟨10.1111/mmi.14881⟩. ⟨hal-03548887v2⟩
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