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Candida albicans.

Duncan Wilson1

  • 1Medical Research Council Centre for Medical Mycology at the University of Aberdeen, Aberdeen Fungal Group, Institute of Medical Sciences, Foresterhill, Aberdeen, UK.

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Summary
This summary is machine-generated.

Candida albicans utilizes two pathways to scavenge zinc, with Zrt2 crucial for acidic conditions and a zincophore system (Pra1/Zrt1) for neutral pH. Both Zrt2 and Zrc1 are vital for fungal colonization in vivo.

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Area of Science:

  • Microbiology
  • Mycology
  • Nutritional Immunity

Background:

  • Pathogens, including Candida albicans, encounter zinc restriction as part of host nutritional immunity.
  • Zinc is essential for microbial growth, and its availability is tightly regulated by host defense mechanisms.
  • Candida albicans has evolved sophisticated systems to acquire and manage zinc in diverse environments.

Purpose of the Study:

  • To elucidate the distinct zinc scavenging pathways employed by Candida albicans.
  • To investigate the roles of specific transporters (Zrt2, Zrt1) and the zincophore system (Pra1) in zinc acquisition.
  • To determine the in vivo significance of zinc homeostasis mechanisms (Zrt2, Zrc1) during infection.

Main Methods:

  • Analysis of zinc uptake mechanisms at different pH levels.
  • Investigation of gene expression and protein activity related to zinc transport and binding.
  • Assessment of fungal colonization in murine models of infection to evaluate the roles of Zrt2 and Zrc1.

Main Results:

  • The plasma membrane transporter Zrt2 is essential for zinc uptake and growth in acidic environments (pH 4).
  • At neutral pH (pH 7), a second system involving the secreted zinc-binding protein Pra1 and receptor Zrt1 becomes active.
  • The Zrc1-dependent detoxification system is crucial for managing excess zinc and generating zincosomes.
  • Both Zrt2 and Zrc1 are essential for Candida albicans colonization of the kidney and liver, respectively, in a murine infection model.

Conclusions:

  • Candida albicans employs a dual strategy for zinc acquisition, adapting to varying pH conditions.
  • The zincophore system (Pra1/Zrt1) represents a unique fungal adaptation for zinc scavenging at neutral pH.
  • Zinc homeostasis, involving both uptake (Zrt2) and detoxification (Zrc1), is critical for Candida albicans pathogenesis.
  • Understanding these zinc acquisition and management pathways offers potential targets for antifungal therapies.