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A more recent version of this article appeared on July 1, 2004
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Submitted on November 4, 2003
Revised on March 31, 2004
Accepted on April 5, 2004
1 Institut für Mikrobiologie, Heinrich-Heine-Universität, 40225 Düsseldorf, Germany
2 Institut für Mikrobiologie and Biomedizinisches Forschungszentrum, Heinrich-Heine-Universität, 40225 Düsseldorf, Germany
3 Aberdeen Fungal Group, Institute of Medical Sciences, University of Aberdeen, Aberdeen AB25 2ZD, UK
* Corresponding author. E-mail address: joachim.ernst{at}uni-duesseldorf.de.
Fungal APSES proteins regulate morphogenetic processes including filamentation and differentiation. The human fungal pathogen Candida albicans contains two APSES proteins: the regulator Efg1p and its homologue Efh1p, described here. Overexpression of EFG1 or EFH1 led to similar phenotypes including pseudohypha formation and opaque-white switching. An efh1 deletion generated no phenotype under most conditions, but caused hyperfilamentation in an efg1 background under embedded or hypoxic conditions. This suggests cooperation of these APSES proteins in the suppression of an alternative morphogenetic signaling pathway. Genome-wide transcriptional profiling revealed that EFG1 and EFH1 regulate partially overlapping sets of genes associated with filament formation. Unexpectedly, Efg1p not only regulates genes involved in morphogenesis but also strongly influences the expression of metabolic genes, inducing glycolytic genes and genes essential for oxidative metabolism. Using one- and two-hybrid assays we further demonstrate that Efg1p is a repressor while Efh1p is an activator of gene expression. Overall, the results suggest that Efh1p supports the regulatory functions of the primary regulator, Efg1p, and indicate a dual role for these APSES proteins in the regulation of fungal morphogenesis and metabolism.
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