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Molecular Microbiology
Article . 2015 . Peer-reviewed
License: Wiley Online Library User Agreement
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The endosomal sorting complex required for transport machinery influences haem uptake and capsule elaboration in Cryptococcus neoformans

Authors: Guanggan, Hu; Mélissa, Caza; Brigitte, Cadieux; Erik, Bakkeren; Eunsoo, Do; Won Hee, Jung; James W, Kronstad;

The endosomal sorting complex required for transport machinery influences haem uptake and capsule elaboration in Cryptococcus neoformans

Abstract

SummaryIron availability is a key determinant of virulence in the pathogenic fungus Cryptococcus neoformans. Previous work revealed that the ESCRT (endosomal sorting complex required for transport) protein Vps23 functions in iron acquisition, capsule formation and virulence. Here, we further characterized the ESCRT machinery to demonstrate that defects in the ESCRT‐II and III complexes caused reduced capsule attachment, impaired growth on haem and resistance to non‐iron metalloprotoporphyrins. The ESCRT mutants shared several phenotypes with a mutant lacking the pH‐response regulator Rim101, and in other fungi, the ESCRT machinery is known to activate Rim101 via proteolytic cleavage. We therefore expressed a truncated and activated version of Rim101 in the ESCRT mutants and found that this allele restored capsule formation but not growth on haem, thus suggesting a Rim101‐independent contribution to haem uptake. We also demonstrated that the ESCRT machinery acts downstream of the cAMP/protein kinase A pathway to influence capsule elaboration. Defects in the ESCRT components also attenuated virulence in macrophage survival assays and a mouse model of cryptococcosis to a greater extent than reported for loss of Rim101. Overall, these results indicate that the ESCRT complexes function in capsule elaboration, haem uptake and virulence via Rim101‐dependent and independent mechanisms.

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Keywords

Antifungal Agents, Endosomal Sorting Complexes Required for Transport, Macrophages, Cryptococcosis, Heme, Cyclic AMP-Dependent Protein Kinases, Disease Models, Animal, Mice, Phenotype, Fungal Capsules, Mutation, Proteolysis, Cryptococcus neoformans, Animals, Fluconazole

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
51
Top 10%
Top 10%
Top 10%
bronze