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Canavanine resistance in Cryptococcus neoformans.

I Polacheck, K J Kwon-Chung

    Antimicrobial Agents and Chemotherapy
    |March 1, 1986
    PubMed
    Summary
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    Cryptococcus neoformans exhibits varied resistance to canavanine. Some strains decompose canavanine, while others have impaired uptake, impacting protein and RNA synthesis.

    Area of Science:

    • Mycology
    • Microbial Pathogenesis
    • Biochemistry

    Background:

    • Cryptococcus neoformans is an opportunistic fungal pathogen.
    • Canavanine is an arginine analog toxic to many organisms.
    • Understanding resistance mechanisms is crucial for antifungal strategies.

    Purpose of the Study:

    • To investigate canavanine resistance in Cryptococcus neoformans var. gattii and var. neoformans.
    • To elucidate the mechanisms underlying canavanine resistance.
    • To determine the toxic effects of canavanine in Cryptococcus.

    Main Methods:

    • Phenotypic testing of Cryptococcus isolates for canavanine susceptibility.
    • Analysis of canavanine decomposition and uptake in resistant strains.
    • Investigation of canavanine's effect on protein and RNA synthesis.

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    Main Results:

    • All Cryptococcus neoformans var. gattii isolates were resistant to canavanine (≥3.5 mM).
    • Cryptococcus neoformans var. neoformans showed varied susceptibility; serotype D and 28% of serotype A were susceptible (≤18 µM), while 72% of serotype A were resistant.
    • Natural resistance involved canavanine decomposition, whereas a resistant mutant showed impaired canavanine uptake.
    • Canavanine toxicity stems from its incorporation into proteins, disrupting protein and RNA synthesis.

    Conclusions:

    • Cryptococcus neoformans exhibits diverse canavanine resistance mechanisms.
    • Canavanine resistance in Cryptococcus is mediated by either decomposition or impaired uptake.
    • Canavanine's toxicity is linked to its incorporation into essential cellular components.