Candida albicans VPS1 contributes to protease secretion, filamentation, and biofilm formation.
Fungal Genet Biol
; 45(6): 861-77, 2008 Jun.
Article
em En
| MEDLINE
| ID: mdl-18296085
ABSTRACT
To investigate the pre-vacuolar secretory pathway in Candida albicans, we cloned and analyzed the C. albicans homolog of the Saccharomyces cerevisiae vacuolar protein sorting gene VPS1. C. albicans VPS1 encodes a predicted 694-aa dynamin-like GTPase that is 73.3% similar to S. cerevisiae Vps1p. Plasmids bearing C. albicans VPS1 complemented the temperature-sensitive growth, abnormal class F vacuolar morphology, and carboxypeptidase missorting of a S. cerevisiae vps1 null mutant. To study VPS1 function in C. albicans, a conditional mutant strain (tetR-VPS1) was generated by deleting the first allele of VPS1 and placing the second allele under control of a tetracycline-regulatable promoter. With doxycycline, the tetR-VPS1 mutant was hyper-susceptible to sub-inhibitory concentrations of fluconazole, but not amphotericin B, 5-fluorocytosine, or non-specific osmotic stresses. The repressed tetR-VPS1 mutant was defective in filamentation and secreted less extracellular protease activity. Biofilm production and filamentation within the biofilm were markedly reduced. These results suggest that C. albicans VPS1 has a key role in several important virulence-related phenotypes.
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Base de dados:
MEDLINE
Assunto principal:
Peptídeo Hidrolases
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Candida albicans
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Biofilmes
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Proteínas de Ligação ao GTP
Idioma:
En
Ano de publicação:
2008
Tipo de documento:
Article