Cited by 37Fungal and yeast genetics researchBacterial Genetics and BiotechnologyMicrobial Metabolic Engineering and Bioproduction

Crz1p Regulates pH Homeostasis in Candida glabrata by Altering Membrane Lipid Composition

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Yan, Dongni, Lin, Xiaobao, Qi, Yanli, Liu, Hui, Chen, Xiulai, Liu, Liming, Chen, Jian·2016·Applied and Environmental Microbiology

Abstract

ABSTRACT The asexual facultative aerobic haploid yeast Candida glabrata is widely used in the industrial production of various organic acids. To elucidate the physiological function of the C. glabrata transcription factor Crz1p (CgCrz1p) and its role in tolerance to acid stress, we deleted or overexpressed the corresponding gene, CgCRZ1 . Deletion of CgCRZ1 resulted in a 60% decrease in the dry weight of cells (DCW) and a 50% drop in cell viability compared with those of the wild type at pH 2.0. Expression of lipid metabolism-associated genes was also significantly downregulated. Consequently, the proportion of C 18:1 fatty acids, the ratio of unsaturated to saturated fatty acids, and the ergosterol content decreased by 30%, 46%, and 30%, respectively. Additionally, membrane integrity, fluidity, and H + -ATPase activity were reduced by 45%, 9%, and 50%, respectively. In contrast, overexpression of CgCrz1p increased C 18:1 and ergosterol contents by 16% and 40%, respectively. Overexpression also enhanced membrane integrity, fluidity, and H + -ATPase activity by 31%, 6%, and 20%, respectively. Moreover, in the absence of pH buffering, the DCW and pyruvate titers increased by 48% and 60%, respectively, compared to that of the wild type. Together, these results suggest that CgCrz1p regulates tolerance to acidic conditions by altering membrane lipid composition in C. glabrata . IMPORTANCE This study provides insight into the metabolism of Candida glabrata under acidic conditions, such as those encountered during the industrial production of organic acids. We found that overexpression of the transcription factor CgCrz1p improved viability, biomass, and pyruvate yields at a low pH. Analysis of plasma membrane lipid composition indicated that CgCrz1p might play an important role in its integrity and fluidity and that it enhanced the pumping of protons in acidic environments. We propose that altering the structure of the cell membrane may provide a successful strategy for increasing C. glabrata productivity at a low pH.

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Crossref · 10.1128/aem.02186-16

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Authors
Yan, D., Lin, X., Qi, Y., Liu, H., Chen, X., Liu, L., & Chen, J.
Affiliations
  • Jiangnan University (CN)
  • State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu, China
Venue
Applied and Environmental Microbiology
Published
2016-12
Volume
82
Issue
23
Pages
6920-6929
ISSN
  • 0099-2240 (ISSN-L)
  • 1098-5336
OpenAlex
W2522397107
Cited by
37
References
55
Citations by year
2025: 5 · 2024: 1 · 2023: 5 · 2022: 10 · 2021: 3 · 2020: 3 · 2019: 5 · 2018: 3 · 2017: 2
FWCI
1.73
Type
journal article
Language
en
Open access
Locations
  • Applied and Environmental Microbiology (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
National Natural Science Foundation of China (31270079, 21422602)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Fungal and yeast genetics research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Bacterial Genetics and Biotechnology
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Microbial Metabolic Engineering and Bioproduction
Keywords
Candida glabrata, pH homeostasis, acid resistance, membrane lipid composition, transcription factors, membrane fluidity, membrane integrity, H+-ATPase activity, ergosterol, unsaturated fatty acids, pyruvate production, organic acid production, lipid metabolism

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