
The TEA/ATTS transcription factor YlTec1p represses the yeast-to-hypha transition in the dimorphic yeast Yarrowia lipolytica.
Tec1p in the budding yeast Saccharomyces cerevisiae is important for dimorphic transition. In this study, we identified a homologue of Tec1p, YlTec1p, in the distantly related dimorphic yeast Yarrowia lipolytica. YlTec1p contains an evolutionarily conserved TEA/ATTS DNA-binding domain. Expression of YlTEC1 in S. cerevisiae tec1Δ cells rescued the invasive growth defect and activated a FLO11-lacZ reporter, indicating that YlTec1p is functionally related to Tec1p. However, YlTEC1 expression failed to activate an FRE-lacZ reporter, suggesting that these two transcription factors are different. YlTEC1 plays a negative role in the yeast-to-hypha transition in Y. lipolytica based on gene deletion and overexpression studies. We show that YlTec1p activates rather than represses gene expression in Y. lipolytica by yeast one-hybrid assay, and YlTec1p is critical for the activation of FLO11-lacZ in Y. lipolytica. In addition, YlTec1p localized to the nucleus and its nuclear localization decreased during hyphal growth. We speculate that YlTec1p may normally regulate the expression of a set of target genes that may prevent rather than promote hyphal development in Y. lipolytica. Our study also suggests that YlTEC1 may not be largely regulated by the cAMP-protein kinase A pathway.
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Related Subject Headings
- Yarrowia
- Transcription Factors
- Sequence Alignment
- Saccharomyces cerevisiae Proteins
- Saccharomyces cerevisiae
- Microbiology
- Hyphae
- Genetic Complementation Test
- Genes, Reporter
- Gene Expression Regulation, Fungal
Citation

Published In
DOI
EISSN
ISSN
Publication Date
Volume
Issue
Start / End Page
Related Subject Headings
- Yarrowia
- Transcription Factors
- Sequence Alignment
- Saccharomyces cerevisiae Proteins
- Saccharomyces cerevisiae
- Microbiology
- Hyphae
- Genetic Complementation Test
- Genes, Reporter
- Gene Expression Regulation, Fungal