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Infection and Immunity, December 2005, p. 7977-7987, Vol. 73, No. 12
0019-9567/05/$08.00+0     doi:10.1128/IAI.73.12.7977-7987.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.

Deletions of Endocytic Components VPS28 and VPS32 Affect Growth at Alkaline pH and Virulence through both RIM101-Dependent and RIM101-Independent Pathways in Candida albicans

Muriel Cornet,^1,2, Frédérique Bidard,^1, Patrick Schwarz,³ Grégory Da Costa,¹ Sylvie Blanchin-Roland,¹ Françoise Dromer,³ and Claude Gaillardin^1*

Microbiologie et Génétique Moléculaire, Institut National Agronomique Paris-Grignon and Institut National de la Recherche Agronomique UMR1238, Centre National de la Recherche Scientifique UMR2585, 78850 Thiverval-Grignon, France,¹ Microbiologie, Hôtel-Dieu, 1 place du parvis Notre-Dame, 75181 Paris Cedex 04, France,² Unité de Mycologie Moléculaire, CNRS FRE2849, Institut Pasteur, 25 rue du Dr. Roux, 75724 Paris Cedex 15, France³

Received 26 April 2005/ Returned for modification 31 May 2005/ Accepted 7 September 2005

Ambient pH signaling involves a cascade of conserved Rim or Pal products in ascomycetous yeasts or filamentous fungi, respectively. Recent evidences in the fungi Aspergillus nidulans, Saccharomyces cerevisiae, Yarrowia lipolytica, and Candida albicans suggested that components of endosomal sorting complexes required for transport (ESCRT) involved in endocytic trafficking were needed for signal transduction along the Rim pathway. In this study, we confirm these findings with C. albicans and show that Vps28p (ESCRT-I) and Vps32p/Snf7p (ESCRT-III) are required for the transcriptional regulation of known targets of the Rim pathway, such as the PHR1 and PHR2 genes encoding cell surface proteins, which are expressed at alkaline and acidic pH, respectively. We additionally show that deletion of these two VPS genes, particularly VPS32, has a more drastic effect than a RIM101 deletion on growth at alkaline pH and that this effect is only partially suppressed by expression of a constitutively active form of Rim101p. Finally, in an in vivo mouse model, both vps null mutants were significantly less virulent than a rim101 mutant, suggesting that VPS28 and VPS32 gene products affect virulence both through Rim-dependent and Rim-independent pathways.

Editor: T. R. Kozel

Both authors contributed equally to this work.

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