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Farnesol and dodecanol effects on the Candida albicans Ras1-cAMP signalling pathway and the regulation of morphogenesis.

Abstract：

:Candida albicans hypha formation which has been stimulated via the Ras1-cAMP-Efg1 signalling cascade is inhibited by farnesol, a C. albicans autoregulatory factor, and small molecules such as dodecanol. In cultures containing farnesol or dodecanol, hypha formation was restored upon addition of dibutyryl-cAMP. The CAI4-Ras1(G13V) strain, which carries a dominant-active variant of Ras1 and forms hyphae in the absence of inducing stimuli, grew as yeast in medium with farnesol or dodecanol; the heat shock sensitivity of the CAI4-Ras1(G13V) strain was also suppressed by these compounds. Neither Pde1 nor Pde2 was necessary for the repression of hyphal growth by farnesol or dodecanol. Two transcripts, CTA1 and HSP12, which are at higher levels upon mutation of Ras1 or Cdc35, were increased in abundance in cells grown with farnesol or dodecanol. Microscopic analysis of strains carrying CTA1 and HWP1 promoter fusions grown with intermediate concentrations of farnesol or dodecanol indicated a link between cells with the increased expression of cAMP-repressed genes and cells repressed for hypha formation. Because several cAMP-controlled outputs are affected by farnesol and dodecanol, our findings suggest that these compounds impact activity of the Ras1-Cdc35 pathway, thus leading to an alteration of C. albicans morphology.

journal_name

Mol Microbiol

journal_title

Molecular microbiology

authors

Davis-Hanna A,Piispanen AE,Stateva LI,Hogan DA

doi

10.1111/j.1365-2958.2007.06013.x

subject

Has Abstract

pub_date

2008-01-01 00:00:00

pages

47-62

issue

1

eissn

0950-382X

issn

1365-2958

pii

MMI6013

journal_volume

67

pub_type

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