The Impact of Transcriptional Factors Znf1 and Sip4 on Xylose Alcoholic Fermentation in Recombinant Strains of Yeast Saccharomyces Cerevisiae

Dzanaeva, Ljubov; Ruchała, Justyna; Sibirny, Andriy А.; Dmytruk, Kostyantyn V.

doi:10.3103/s0095452720050035

Cited by 3 publications

(1 citation statement)

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“…A previous study reported that ZNF1 knockout strongly decreases xylose utilisation during the post-glucose effect, but its overexpression had no effect [ 29 ]. Additionally, in another study, the overexpression or deletion of the ZNF1 gene did not affect the fermentation ability of a xylose-fermenting strain engineered on the S. cerevisiae GS010 background [ 30 ]. Nevertheless, the role of Znf1 in xylose utilisation in native S. cerevisiae has never been fully explored.…”

Section: Introductionmentioning

confidence: 99%

Activation of cryptic xylose metabolism by a transcriptional activator Znf1 boosts up xylitol production in the engineered Saccharomyces cerevisiae lacking xylose suppressor BUD21 gene

et al. 2022

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Background Xylitol is a valuable pentose sugar alcohol, used in the food and pharmaceutical industries. Biotechnological xylitol production is currently attractive due to possible conversion from abundant and low-cost industrial wastes or agricultural lignocellulosic biomass. In this study, the transcription factor Znf1 was characterised as being responsible for the activation of cryptic xylose metabolism in a poor xylose-assimilating S. cerevisiae for xylitol production. Results The results suggest that the expression of several xylose-utilising enzyme genes, encoding xylose reductases for the reduction of xylose to xylitol was derepressed by xylose. Their expression and those of a pentose phosphate shunt and related pathways required for xylose utilisation were strongly activated by the transcription factor Znf1. Using an engineered S. cerevisiae strain overexpressing ZNF1 in the absence of the xylose suppressor bud21Δ, xylitol production was maximally by approximately 1200% to 12.14 g/L of xylitol, corresponding to 0.23 g/g xylose consumed, during 10% (w/v) xylose fermentation. Proteomic analysis supported the role of Znf1 and Bud21 in modulating levels of proteins associated with carbon metabolism, xylose utilisation, ribosomal protein synthesis, and others. Increased tolerance to lignocellulosic inhibitors and improved cell dry weight were also observed in this engineered bud21∆ + pLJ529-ZNF1 strain. A similar xylitol yield was achieved using fungus-pretreated rice straw hydrolysate as an eco-friendly and low-cost substrate. Conclusions Thus, we identified the key modulators of pentose sugar metabolism, namely the transcription factor Znf1 and the suppressor Bud21, for enhanced xylose utilisation, providing a potential application of a generally recognised as safe yeast in supporting the sugar industry and the sustainable lignocellulose-based bioeconomy. Graphical Abstract

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Section: Introductionmentioning

confidence: 99%