Mass spectrometric analysis of the secretome of Candida albicans

Yeast
Alice G SorgoFrans M Klis

Abstract

The pathogenic fungus Candida albicans secretes a considerable number of hydrolases and other proteins. In-depth studies of the C. albicans secretome could thus provide new candidates for diagnostic markers and vaccine development. We compared various growth conditions differing in pH, temperature and the presence of the hyphal inducer N-acetylglucosamine. The polypeptide content of the growth media was ca. 0.1-0.2% of the total biomass. Using LC-tandem mass spectrometry, we identified 44 secretory proteins, the transmembrane protein Msb2, six secretory pathway-associated proteins and 28 predicted cytosolic proteins. Many secretory proteins are wall-related, suggesting that their presence in the growth medium is at least partially due to accidental release from the walls. Als3, Csa2, Rbt4, Sap4 and Sap6 were enriched in the medium of hyphal cultures; Bgl2, Cht3, Dag7, Eng1, Pir1, Rbe1, Scw11, Sim1/Sun42, Xog1 and Ywp1 in the medium of yeast cells; and Plb4.5 in pH 4 medium. Seven proteins (Cht3, Mp65, Orf19.5063/Coi1, Scw11, Sim1, Sun41 and Tos1) were consistently present under all conditions tested. These observations indicate that C. albicans tightly regulates its secretome. Mp65, Sun41, and Tos1 were each predicted to contai...Continue Reading

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