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Two Rac paralogs regulate polarized growth in the human fungal pathogen Cryptococcus neoformans.


ABSTRACT: A genome wide analysis of the human fungal pathogen Cryptococcus neoformans var. grubii has revealed a number of duplications of highly conserved genes involved in morphogenesis. Previously, we reported that duplicate Cdc42 paralogs provide C. neoformans with niche-specific responses to environmental stresses: Cdc42 is required for thermotolerance, while Cdc420 supports the formation of titan cells. The related Rho-GTPase Rac1 has been shown in C. neoformans var. neoformans to play a major role in filamentation and to share Cdc42/Cdc420 binding partners. Here we report the characterization of a second Rac paralog in C. neoformans, Rac2, and describe its overlapping function with the previously described CnRac, Rac1. Further, we demonstrate that the Rac paralogs play a primary role in polarized growth via the organization of reactive oxygen species and play only a minor role in the organization of actin. Finally, we provide preliminary evidence that pharmacological inhibitors of Rac activity and actin stability have synergistic activity.

SUBMITTER: Ballou ER 

PROVIDER: S-EPMC3742549 | biostudies-literature | 2013 Aug

REPOSITORIES: biostudies-literature

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Two Rac paralogs regulate polarized growth in the human fungal pathogen Cryptococcus neoformans.

Ballou Elizabeth Ripley ER   Selvig Kyla K   Narloch Jessica L JL   Nichols Connie B CB   Alspaugh J Andrew JA  

Fungal genetics and biology : FG & B 20130605


A genome wide analysis of the human fungal pathogen Cryptococcus neoformans var. grubii has revealed a number of duplications of highly conserved genes involved in morphogenesis. Previously, we reported that duplicate Cdc42 paralogs provide C. neoformans with niche-specific responses to environmental stresses: Cdc42 is required for thermotolerance, while Cdc420 supports the formation of titan cells. The related Rho-GTPase Rac1 has been shown in C. neoformans var. neoformans to play a major role  ...[more]

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