Cited by 33Antifungal resistance and susceptibilityFungal and yeast genetics researchFungal Infections and Studies

The fungal pathogen Candida glabrata does not depend on surface ferric reductases for iron acquisition

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Gerwien, Franziska, Safyan, Abu, Wisgott, Stephanie, Brunke, Sascha, Kasper, Lydia, Hube, Bernhard·2017·Frontiers in Microbiology

Abstract

Iron acquisition is a crucial virulence determinant for many bacteria and fungi, including the opportunistic fungal pathogens Candida albicans and C. glabrata. While the diverse strategies used by C. albicans for obtaining iron from the host are well-described, much less is known about the acquisition of this micronutrient from host sources by C. glabrata – a distant relative of C. albicans with closer evolutionary ties to Saccharomyces cerevisiae, which nonetheless causes severe clinical symptoms in humans. Here we show that C. glabrata is much more restricted than C. albicans in using host iron sources, lacking, for example, the ability to grow on transferrin and hemin/hemoglobin. Instead, C. glabrata is able to use ferritin and non-protein-bound iron (FeCl3) as iron sources in a pH-dependent manner. As in other fungal pathogens, iron-dependent growth requires the reductive high affinity (HA)-iron uptake system. Typically highly conserved, this uptake mechanism normally relies on initial ferric reduction by cell-surface ferric reductases. The C. glabrata genome contains only three such putative ferric reductases, which were found to be dispensable for iron-dependent growth. In addition and in contrast to C. albicans and S. cerevisiae, we also detected no surface ferric reductase activity in C. glabrata. Instead, extracellular ferric reduction was found in this and the two other fungal species, which was largely dependent on an excreted low-molecular weight, non-protein ferric reductant. We therefore propose an iron acquisition strategy of C. glabrata which differs from other pathogenic fungi, such as C. albicans, in that it depends on a limited set of host iron sources and that it lacks the need for surface ferric reductases. Extracellular ferric reduction by a secreted molecule possibly compensates for the loss of surface ferric reductase activity in the HA-iron uptake system.

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  • Putative CFEM domain-containing protein CgCcw14, haem oxygenase CgHmx1, and intracellular iron trafficking machinery components including vacuolar and mitochondrial iron transporters have been identified in C. glabrata.

    “Recently, putative cell surface-associated, cysteine-rich Common in Fungal Extracellular Membrane (CFEM) domain-containing protein (CgCcw14), haem oxygenase (CgHmx1) and intracellular iron trafficking machinery components including vacuolar (CgCcc1, CgSmf1, CgSmf3, and CgFth1) and mitochondrial (CgMmt1, CgMmt2, CgAtm1, CgMrs3, and CgMrs4) iron transporters have been identified in C. glabrata [122,”

    From Candida glabrata: A Lot More Than Meets the Eye (2019) · cites this paper as [125]

  • C. glabrata is unable to utilize the host iron proteins haemoglobin and transferrin as iron sources.

    “C. glabrata is also unable to utilize the host iron proteins, haemoglobin, and transferrin, as iron sources [125].”

    From Candida glabrata: A Lot More Than Meets the Eye (2019) · cites this paper as [125]

  • C. glabrata could utilize ferritin and ferric chloride as iron sources in a pH-dependent manner via the reductive high-affinity iron uptake system.

    “C. glabrata could also utilize ferritin and ferric chloride as iron sources in a pH-dependent manner via reductive high-affinity iron uptake system [125].”

    From Candida glabrata: A Lot More Than Meets the Eye (2019) · cites this paper as [125]

  • Despite the presence of three ferric reductase genes, C. glabrata exhibited no surface ferric reductase activity.

    “Despite the presence of three ferric reductase genes, C. glabrata exhibited no surface ferric reductase activity, and it has been postulated that extracellular ferric reduction may be achieved through a secreted molecule [125].”

    From Candida glabrata: A Lot More Than Meets the Eye (2019) · cites this paper as [125]

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Authors
Gerwien, F., Safyan, A., Wisgott, S., Brunke, S., Kasper, L., & Hube, B.
Affiliations
  • Leibniz-Institut für Naturstoff-Forschung und Infektionsbiologie e. V. - Hans-Knöll-Institut (HKI) (DE)
  • Jena University Hospital (DE)
Corresponding author
Kasper, Lydia
Venue
Frontiers in Microbiology
Published
2017-06-08
Volume
8
Pages
1055-1055
ISSN
1664-302X (ISSN-L)
OpenAlex
W2624428734
Cited by
33
References
94
Citations by year
2026: 3 · 2025: 2 · 2024: 3 · 2023: 8 · 2022: 1 · 2021: 3 · 2020: 6 · 2019: 2 · 2018: 4 · 2017: 1
FWCI
2.74
Type
journal article
Language
en
Open access
Licence
cc-by
Locations
  • Frontiers in Microbiology (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
  • Deutsche Forschungsgemeinschaft (SPP 1580, HU 528/16-2, 01EO1002)
  • Bundesministerium für Bildung und Forschung (01EO1002)
  • International Leibniz Research School for Microbial and Biomolecular Interactions
  • Leibniz-Gemeinschaft
Topics
  • Health Sciences › Medicine › Infectious Diseases › Antifungal resistance and susceptibility
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Fungal and yeast genetics research
  • Health Sciences › Medicine › Epidemiology › Fungal Infections and Studies
Keywords
Candida glabrata, iron acquisition, ferric reductase, high-affinity iron uptake, ferritin, transferrin, hemin, hemoglobin, opportunistic fungal pathogens, Candida albicans comparison

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