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Zrg1, a cryptococcal protein associated with regulation of growth in nutrient deprivation conditions. | LitMetric
Cryptococcus gattii is one of the causes of cryptococcosis, a life-threatening disease generally characterized by pneumonia and/or meningitis. Zinc is an essential element for life, being required for the activity of many proteins with catalytic and structural roles. Here, we characterize ZRG1 (zinc-related gene 1), which codes a product involved in zinc metabolism. Transcriptional profiling revealed that zinc availability regulated the expression of ZRG1, and its null mutants demonstrated impaired growth in zinc- and nitrogen-limiting conditions. Moreover, zrg1 strains displayed alterations in the expression of the zinc homeostasis-related genes ZAP1 and ZIP1. Notably, cryptococcal cells lacking Zrg1 displayed upregulation of autophagy-like phenotypes. Despite no differences were detected in the classical virulence-associated traits; cryptococcal cells lacking ZRG1 displayed decreased capacity for survival inside macrophages and attenuated virulence in an invertebrate model. Together, these results indicate that ZRG1 plays an important role in proper zinc metabolism, and is necessary for cryptococcal fitness and virulence.
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