title: A novel Candida glabrata cell wall associated serine protease.
abstract: We set out to identify the Candida glabrata cell wall attached proteases which may play a role as virulence factors in candidosis, particularly in the immunocompromized host. We studied a clinical C. glabrata strain T-1639, which was isolated from a patient from the Helsinki University Central Hospital. With non-reducing 2-D electrophoresis using parallel fluorogenic gels and mass spectrometry we identified a novel appr. 25 kDa (192 aa in length) cell wall located protease with an estimated pI of 7.6. The LC-MS/MS peptides matched with the ORF of predicted C. glabrata CBS138 cell wall protein Cwp1.2p/pI 7.7/212 aa (http://cbi.labri.fr/Génolevures/[NCBI access 49525604, UniProt access Q6FTZ7]), which is an ortholog to Saccharomyces cerevisiae cell wall protein Cwp1p (UniProt access P28319). The novel serine protease was released by β-1,3-glucanase treatment from the cell wall. In contrast to previous predictions this protease has an enzymatic function instead of being merely a structural cell wall protein. The protease showed gelatinolytic activity and was inhibited by PMSF, a known serine protease inhibitor. Further characterization of the protease may give insight to its role in infections caused by C. glabrata and possibly aid in the development of new kinds of antifungal drugs.
authors.affiliation: Department of Biosciences, Division of Biochemistry and Biotechnology, University of Helsinki, Finland; Institute of Dentistry, University of Helsinki, Finland. Electronic address: pirjo.parnanen@helsinki.fi.
authors.forename: Pirjo
authors.initials: P
authors.lastname: Pärnänen
authors.affiliation: Institute of Dentistry, University of Helsinki, Finland; Department of Oral and Maxillofacial Diseases, Helsinki University Central Hospital (HUCH), Helsinki, Finland.
authors.forename: Jukka H
authors.initials: JH
authors.lastname: Meurman
authors.affiliation: Department of Biosciences, Division of Biochemistry and Biotechnology, University of Helsinki, Finland.
authors.forename: Pirjo
authors.initials: P
authors.lastname: Nikula-Ijäs
mesh_terms: D000595:Amino Acid Sequence; D041221:Candida glabrata / Q000737:chemistry / Q000201:enzymology*; D002177:Candidiasis / Q000382:microbiology*; D002473:Cell Wall / Q000737:chemistry / Q000201:enzymology*; D015180:Electrophoresis, Gel, Two-Dimensional; D006801:Humans; D008969:Molecular Sequence Data; D057057:Serine Proteases / Q000032:analysis*; D053719:Tandem Mass Spectrometry
chemical_list: D057057:Serine Proteases
keywords: Candida glabrata; Serine protease; Yeast cell wall