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Novel regulatory function for the CCAAT-binding factor in Candida albicans
Duncan C Johnson1, Kristin E Cano, Erika C Kroger
1Department of Biological Sciences, SCEN601, University of Arkansas, Fayetteville, Arkansas 72701, USA.
Eukaryotic Cell
|October 11, 2005
Summary
The CCAAT-binding factor in Candida albicans acts as a repressor, unlike in yeast. This finding reveals new insights into carbon metabolism regulation in this opportunistic pathogen.
Area of Science:
- Microbiology
- Molecular Biology
- Medical Mycology
Background:
- Candida albicans is an opportunistic pathogen exhibiting dimorphism, influenced by environmental cues.
- The CCAAT-binding factor is known to activate respiratory genes in Saccharomyces cerevisiae.
Purpose of the Study:
- To investigate the function of the CCAAT-binding factor in Candida albicans.
- To characterize the role of CaHAP5 in C. albicans gene regulation and cellular processes.
Main Methods:
- Cloning of CaHAP5 and generation of a hap5delta/hap5delta mutant.
- Mobility shift assays to identify DNA-binding complexes.
- Analysis of hyphal development and gene expression in the mutant.
Main Results:
- The hap5delta/hap5delta mutant showed defects in hyphal development and a "hyperfilamentation" phenotype.
- Sequence-specific CCAAT-binding complexes were identified and abolished in the mutant.
- mRNA levels of respiration-related genes (COX5, CYC1) were overexpressed in the mutant.
Conclusions:
- The C. albicans CCAAT-binding factor functions as a repressor of mitochondrial electron transport genes, contrasting with its role in S. cerevisiae.
- This study provides the first evidence of the CCAAT-binding factor acting as a transcriptional repressor.
- Regulation of carbon metabolism in C. albicans is complex and involves novel regulatory mechanisms.