title: Impact of the transcriptional regulator, Ace2, on the Candida glabrata secretome.
abstract: Candida glabrata is a major fungal pathogen of humans, and the virulence of C. glabrata is increased by inactivation of the transcription factor, Ace2. Our previous examination of the effects of Ace2 inactivation upon the intracellular proteome suggested that the hypervirulence of C. glabrata ace2 mutants might be caused by differences in the secretome. Therefore in this study we have characterised the C. glabrata secretome and examined the effects of Ace2 inactivation upon this extracellular proteome. We have identified 31 distinct proteins in the secretome of wild-type C. glabrata cells by MS/MS of proteins that were precipitated from the growth medium and enriched by affinity chromatography on concanavalin A. Most of these proteins are predicted to be cell wall proteins, cell wall modifying enzymes and aspartyl proteinases. The endochitinase Cts1 and the endoglucanase Egt2 were not detected in the C. glabrata secretome following Ace2 inactivation. This can account for the cell separation defect of C. glabrata ace2 cells. Ace2 inactivation also resulted in the detection of new proteins in the C. glabrata secretome. The release of such proteins might contribute to the hypervirulence of ace2 cells.
authors: COGEME Proteomics Service Facility 1, School of Medical Sciences, University of Aberdeen, Institute of Medical Sciences, Aberdeen, UK.
authors: David A
authors: DA
authors: Stead
authors: Janet
authors: J
authors: Walker
authors: Lucy
authors: L
authors: Holcombe
authors: Samuel R S
authors: SR
authors: Gibbs
authors: Zhikang
authors: Z
authors: Yin
authors: Laura
authors: L
authors: Selway
authors: Geraldine
authors: G
authors: Butler
authors: Alistair J P
authors: AJ
authors: Brown
authors: Ken
authors: K
authors: Haynes
mesh_terms: D041221:Candida glabrata / Q000737:chemistry* / Q000187:drug effects / Q000378:metabolism / Q000472:pathogenicity; D002473:Cell Wall / Q000737:chemistry; D004318:Doxycycline / Q000494:pharmacology; D005110:Extracellular Space / Q000737:chemistry; D005656:Fungal Proteins / Q000235:genetics / Q000378:metabolism*; D006031:Glycosylation; D021382:Protein Sorting Signals; D020543:Proteome / Q000032:analysis* / Q000737:chemistry; D014158:Transcription, Genetic; D014774:Virulence
chemical_list: C505770:ACE2 protein, Candida glabrata; D005656:Fungal Proteins; D021382:Protein Sorting Signals; D020543:Proteome; D004318:Doxycycline