Eukaryotic Cell Visit the Journal of Bacteriology
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Eukaryotic Cell, April 2003, p. 351-361, Vol. 2, No. 2
1535-9778/03/$08.00+0     DOI: 10.1128/EC.2.2.351-361.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.

The Hog1 Mitogen-Activated Protein Kinase Is Essential in the Oxidative Stress Response and Chlamydospore Formation in Candida albicans

Rebeca Alonso-Monge, Federico Navarro-García, Elvira Román, Ana I. Negredo,{dagger} Blanca Eisman, César Nombela, and Jesús Pla*

Departamento de Microbiología II, Facultad de Farmacia, Universidad Complutense de Madrid, E-28040 Madrid, Spain

Received 21 October 2002/ Accepted 6 January 2003

Candida albicans mutants with mutations in mitogen-activated protein (MAP) kinase HOG1 displayed an increased sensitivity to agents producing reactive oxygen species, such as oxidants (menadione, hydrogen peroxide, or potassium superoxide), and UV light. Consistent with this finding, C. albicans Hog1 was activated not only in response to an increase in external osmolarity, as happens with its Saccharomyces cerevisiae homologue, but also in response to hydrogen peroxide. The Hog1-mediated response to oxidative stress was different from that of transcription factor Cap1, the homologue of S. cerevisiae Yap1, as shown by the different sensitivities to oxidants and the kinetics of cell death of cap1{Delta}, hog1, and hog1 cap1{Delta} mutants. Deletion of CAP1 did not influence the level of Hog1 phosphorylation, and deletion of HOG1 did not affect Cap1 nuclear localization. Moreover, we show that the HOG1 gene plays a role in chlamydospore formation, another oxygen-related morphogenetic event, as demonstrated by the fact that hog1 cells were unable to generate these thick-walled structures in several media through a mechanism different from that of the EFG1 regulator. This is the first demonstration of the role of the Hog1-mediated MAP kinase pathway in resistance to oxidative stress in pathogenic fungi, and it allows us to propose a molecular model for the oxidative stress response in C. albicans.

* Corresponding author. Mailing address: Departamento de Microbiología II, Facultad de Farmacia, Universidad Complutense de Madrid, Plaza de Ramón y Cajal s/n, E-28040 Madrid, Spain. Phone: 34 91 3941617. Fax: 34 91 3941745. E-mail: jesuspla{at}farm.ucm.es.

{dagger} Present address: Centro Nacional de Microbiología, Instituto de Salud Carlos III, E-28220 Majadahonda, Madrid, Spain.

Eukaryotic Cell, April 2003, p. 351-361, Vol. 2, No. 2
1535-9778/03/$08.00+0     DOI: 10.1128/EC.2.2.351-361.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.



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