Wide distribution of D-xylose dehydrogenase in yeasts reveals a new element in the D-xylose metabolism for bioethanol production

Abstract D-xylose utilization by yeasts is an essential feature for improving second-generation ethanol production. However, industrial yeast strains are incapable of consuming D-xylose. Previous analyzes of D-xylose-consuming or fermenting yeast species reveal that the genomic features associated w...

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Bibliographic Details
Published in:FEMS yeast research 2023-01, Vol.23
Main Authors: Galhardo, Juliana P, Piffer, André P, Fiamenghi, Mateus B, Borelli, Guilherme, da Silva, Duguay R M, Vasconcelos, Adrielle A, Carazzolle, Marcelo F, Pereira, Gonçalo A G, José, Juliana
Format: Article
Language:English
Subjects:
Aldehyde Reductase - metabolism
Biofuels
Codons
Dehydrogenases
Enzymes
Ethanol
Fermentation
Genomes
Metabolic pathways
Metabolism
Phenotypes
Positive selection
Transcriptomes
Xylose
Xylose - metabolism
Xylose reductase
Yeast
Yeasts - genetics
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Summary:Abstract D-xylose utilization by yeasts is an essential feature for improving second-generation ethanol production. However, industrial yeast strains are incapable of consuming D-xylose. Previous analyzes of D-xylose-consuming or fermenting yeast species reveal that the genomic features associated with this phenotype are complex and still not fully understood. Here we present a previously neglected yeast enzyme related to D-xylose metabolism, D-xylose dehydrogenase (XylDH), which is found in at least 105 yeast genomes. By analyzing the XylDH gene family, we brought evidence of gene evolution marked by purifying selection on codons and positive selection evidence in D-xylose-consuming and fermenting species, suggesting the importance of XylDH for D-xylose-related phenotypes in yeasts. Furthermore, although we found no putative metabolic pathway for XylDH in yeast genomes, namely the absence of three bacterial known pathways for this enzyme, we also provide its expression profile on D-xylose media following D-xylose reductase for two yeasts with publicly available transcriptomes. Based on these results, we suggest that XylDH plays an important role in D-xylose usage by yeasts, likely being involved in a cofactor regeneration system by reducing cofactor imbalance in the D-xylose reductase pathway. It is presented a previously neglected yeast enzyme, XylDH, which is proposed to be an important factor for yeast metabolism, being key for second generation ethanol improvement.
ISSN:1567-1364
1567-1356
1567-1364
DOI:10.1093/femsyr/foad003