Msn2-and Msn4-like transcription factors play no obvious roles in the stress responses of the fungal pathogen Candida albicans

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DOIResolve DOI: http://doi.org/10.1128/EC.3.5.1111-1123.2004
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TypeArticle
Journal titleEukaryotic Cell
Volume3
Issue5
Pages11111123; # of pages: 13
SubjectCandida; Candida albicans; Dna; genome; Heat; Human; pha; Proteins; Saccharomyces cerevisiae; Stress; Transcription Factors; Zinc
AbstractIn Saccharomyces cerevisiae, the (C2H2)2 zinc finger transcription factors Msn2 and Msn4 play central roles in responses to a range of stresses by activating gene transcription via the stress response element (STRE; CCCCT). The pathogen Candida albicans displays stress responses that are thought to help it survive adverse environmental conditions encountered within its human host. However, these responses differ from those in S. cerevisiae, and hence we predicted that the roles of Msn2- and Msn4-like proteins might have been functionally reassigned in C. albicans. C. albicans has two such proteins: CaMsn4 and Mnl1 (for Msn2- and Msn4-like). CaMSN4, but not MNL1, weakly complemented the inability of an S. cerevisiae msn2 msn4 mutant to activate a STRE-lacZ reporter. Also, the disruption of CaMsn4 and Mnl1 had no discernible effect upon the resistance of C. albicans to heat, osmotic, ethanol, nutrient, oxidative, or heavy-metal stress or upon the stress-activated transcriptome in C. albicans. Furthermore, although Cap1-dependent activation of a Yap response element-luciferase reporter was observed, a STRE reporter was not activated in response to stresses in C. albicans. Ectopic expression of CaMsn4 or Mnl1 did not affect the cellular or molecular responses of C. albicans to stress. Under the conditions tested, the putative activation and DNA binding domains of CaMsn4 did not appear to be functional. These data suggest that CaMsn4 and Mnl1 do not contribute significantly to stress responses in C. albicans. The data are consistent with the idea that stress signaling in this fungus has diverged significantly from that in budding yeast.
Publication date
LanguageEnglish
AffiliationNRC Biotechnology Research Institute; National Research Council Canada
NoteEnglish15470239
Peer reviewedNo
NRC number46183
NPARC number3539971
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Record identifierb04586a3-d16c-441a-aa68-580d29e6b2c2
Record created2009-03-01
Record modified2016-05-09
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