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Gene of the transcriptional activator MET4 is involved in regulation of glutathione biosynthesis in the methylotrophic yeast Ogataea (Hansenula) polymorpha
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Gene of the transcriptional activator MET4 is involved in regulation of glutathione biosynthesis in the methylotrophic yeast Ogataea (Hansenula) polymorpha
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Journal Article
Gene of the transcriptional activator MET4 is involved in regulation of glutathione biosynthesis in the methylotrophic yeast Ogataea (Hansenula) polymorpha
2018
Overview
Glutathione is the most abundant cellular thiol and the low molecular weight peptide present in cells. The methylotrophic yeast Ogataea (Hansenula) polymorpha is considered as a promising cell factory for the synthesis of glutathione. In this study, a competitive O. polymorpha glutathione producer was constructed by overexpression of the GSH2 gene, encoding γ-glutamylcysteine synthetase, the first enzyme involved in glutathione biosynthesis, and the MET4 gene coding for central regulator of sulfur metabolism. Overexpression of MET4 gene in the background of overexpressed GSH2 gene resulted in 5-fold increased glutathione production during shake flask cultivation as compared to the wild-type strain, reaching 2167 mg L-1. During bioreactor cultivation, glutathione accumulation by obtained recombinant strain was 5-fold increased relative to that by the parental strain with overexpressed only GSH2 gene, on the first 25 h of batch cultivation in mineral medium. Obtained results suggest involvement of Met4 transcriptional activator in regulation of GSH synthesis in the methylotrophic yeast O. polymorpha.
Publisher
Oxford University Press
Subject
Basic-Leucine Zipper Transcription Factors - genetics
/ Basic-Leucine Zipper Transcription Factors - metabolism
/ Basic-Leucine Zipper Transcription Factors/genetics/metabolism
/ Biomass
/ Cysteine
/ Ethylenediaminetetraacetic acid
/ Fungal Proteins - metabolism
/ Fungal Proteins/genetics/metabolism
/ Gene Expression Regulation, Fungal
/ Genes
/ Ligases
/ Ogataea
/ Sulfur
/ Thiols
/ Transcription Factors - metabolism
/ yeasts
