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Issue 4, 2013
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A copper hyperaccumulation phenotype correlates with pathogenesis in Cryptococcus neoformans

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Abstract

Cryptococcus neoformans is a major human pathogen and a cause of meningoencephalitis in immunocompromised patients. Many factors contribute to the extraordinary survivability and pathogenicity of this fungus in humans, including copper homeostasis pathways. Previous work has shown that deletion of the copper-dependent regulator Cuf1 results in decreased virulence and dissemination in brain infection, suggesting that copper acquisition is important to the persistence of this pathogen. Here, we show that the minimal copper quota of C. neoformans is maintained at a high level even when grown under conditions of stringent copper limitation. Intriguingly, when this fungal pathogen is grown in standard and copper-enriched media, it sequesters even higher levels of this essential metal, achieving levels that are far higher than non-pathogenic S. cerevisiae. The hypothesis that copper acquisition plays an essential role in virulence is further corroborated by the findings that a hypovirulent CUF1-deletant strain of C. neoformans retrieved from infected mice contains almost a 6-fold lower concentration of intracellular copper than the pathogenic wild-type strain. The concentration difference arises in part from larger-sized cuf1Δ cell. Under in vitro growth conditions, the size of the cuf1Δ cells is normal and the hypertrophy phenotype is readily induced in vitro under conditions of copper starvation. Taken together, these data suggest that acquisition of extraordinary levels of copper is an important factor in the survivability of the pathogen in the copper-deplete environment of infection, and effective copper concentration may play an important role in the pathogenesis of C. neoformans.

Graphical abstract: A copper hyperaccumulation phenotype correlates with pathogenesis in Cryptococcus neoformans

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Publication details

The article was received on 05 Nov 2012, accepted on 18 Feb 2013 and first published on 19 Feb 2013


Article type: Paper
DOI: 10.1039/C3MT20220H
Citation: Metallomics, 2013,5, 363-371
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    A copper hyperaccumulation phenotype correlates with pathogenesis in Cryptococcus neoformans

    M. R. Raja, S. R. Waterman, J. Qiu, R. Bleher, P. R. Williamson and T. V. O'Halloran, Metallomics, 2013, 5, 363
    DOI: 10.1039/C3MT20220H

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