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Control of Ras-Mediated Signaling in Aspergillus fumigatus

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Abstract

Pathogenic fungi employ numerous mechanisms to flourish in the stressful environment encountered within their mammalian hosts. Central to this arsenal for filamentous fungi is invasive growth within the host microenvironment, mediated by establishment and maintenance of polarized hyphal morphogenesis. In Aspergillus fumigatus, the RasA signal transduction pathway has emerged as a significant regulator of hyphal morphogenesis and virulence, among other processes. The factors contributing to the regulation of RasA itself are not as thoroughly understood, although proper temporal activation of RasA and spatial localization of RasA to the plasma membrane are known to play major roles. Interference with RasA palmitoylation or prenylation results in mislocalization of RasA and is associated with severe growth deficits. In addition, dysregulation of RasA activation results in severe morphologic aberrancies and growth deficits. This review highlights the relationship between RasA signaling, hyphal morphogenesis, and virulence in A. fumigatus and focuses on potential determinants of spatial and temporal RasA regulation.

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Acknowledgments

Support for this work was provided by NIH K22 AI89786-01A1 and R01 AI106925-01A1 to JRF.

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Authors and Affiliations

  1. Department of Microbiology and Immunology, College of Medicine, University of South Alabama, 5851 USA Drive North, MSB 2102, Mobile, AL, 36688, USA

    Tiffany S. Norton & Jarrod R. Fortwendel

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  1. Tiffany S. Norton
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  2. Jarrod R. Fortwendel
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Correspondence to Jarrod R. Fortwendel.

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Norton, T.S., Fortwendel, J.R. Control of Ras-Mediated Signaling in Aspergillus fumigatus . Mycopathologia 178, 325–330 (2014). https://doi.org/10.1007/s11046-014-9765-1

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