Moonlighting proteins are variably exposed at the cell surfaces of Candida glabrata, Candida parapsilosis and Candida tropicalis under certain growth conditions. 2019

Justyna Karkowska-Kuleta, and Dorota Satala, and Oliwia Bochenska, and Maria Rapala-Kozik, and Andrzej Kozik
Department of Comparative Biochemistry and Bioanalytics, Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, Gronostajowa 7, 30-387, Krakow, Poland. justyna.karkowska@uj.edu.pl.

Adaptability to different environmental conditions is an essential characteristic of pathogenic microorganisms as it facilitates their invasion of host organisms. The most external component of pathogenic yeast-like fungi from the Candida genus is the multilayered cell wall. This structure is composed mainly of complex polysaccharides and proteins that can undergo dynamic changes to adapt to the environmental conditions of colonized niches. We utilized cell surface shaving with trypsin and a shotgun proteomic approach to reveal the surface-exposed proteins of three important non-albicans Candida species-C. glabrata, C. parapsilosis and C. tropicalis. These proteinaceous components were identified after the growth of the fungal cells in various culture media, including artificial saliva, artificial urine and vagina-simulative medium under aerobic conditions and anaerobically in rich YPD medium. Several known proteins involved in cell wall maintenance and fungal pathogenesis were identified at the cell surface as were a number of atypical cell wall components-pyruvate decarboxylase (Pdc11), enolase (Eno1) and glyceraldehyde-3-phosphate dehydrogenase (Tdh3) which are so-called 'moonlighting' proteins. Notably, many of these proteins showed significant upregulation at the cell surface in growth media mimicking the conditions of infection compared to defined synthetic medium. Moonlighting proteins are expressed under diverse conditions at the cell walls of the C. glabrata, C. parapsilosis and C. tropicalis fungal pathogens. This indicates a possible universal surface-associated role of these factors in the physiology of these fungi and in the pathology of the infections they cause.

UI MeSH Term Description Entries
D010751 Phosphopyruvate Hydratase A hydro-lyase that catalyzes the dehydration of 2-phosphoglycerate to form PHOSPHOENOLPYRUVATE. Several different isoforms of this enzyme exist, each with its own tissue specificity. Enolase,Neuron-Specific Enolase,2-Phospho-D-Glycerate Hydro-Lyase,2-Phospho-D-Glycerate Hydrolase,2-Phosphoglycerate Dehydratase,Enolase 2,Enolase 3,Muscle-Specific Enolase,Nervous System-Specific Enolase,Non-Neuronal Enolase,alpha-Enolase,beta-Enolase,gamma-Enolase,2 Phospho D Glycerate Hydro Lyase,2 Phospho D Glycerate Hydrolase,2 Phosphoglycerate Dehydratase,Dehydratase, 2-Phosphoglycerate,Enolase, Muscle-Specific,Enolase, Nervous System-Specific,Enolase, Neuron-Specific,Enolase, Non-Neuronal,Hydratase, Phosphopyruvate,Hydro-Lyase, 2-Phospho-D-Glycerate,Muscle Specific Enolase,Nervous System Specific Enolase,Neuron Specific Enolase,Non Neuronal Enolase,System-Specific Enolase, Nervous,alpha Enolase,beta Enolase,gamma Enolase
D011767 Pyruvate Decarboxylase Catalyzes the decarboxylation of an alpha keto acid to an aldehyde and carbon dioxide. Thiamine pyrophosphate is an essential cofactor. In lower organisms, which ferment glucose to ethanol and carbon dioxide, the enzyme irreversibly decarboxylates pyruvate to acetaldehyde. EC 4.1.1.1. 2-Oxo Acid Carboxy-Lyase,Pyruvic Decarboxylase,alpha-Carboxylase,alpha-Ketoacid Carboxylase,2 Oxo Acid Carboxy Lyase,Acid Carboxy-Lyase, 2-Oxo,Carboxy-Lyase, 2-Oxo Acid,Carboxylase, alpha-Ketoacid,Decarboxylase, Pyruvate,Decarboxylase, Pyruvic,alpha Carboxylase,alpha Ketoacid Carboxylase
D002462 Cell Membrane The lipid- and protein-containing, selectively permeable membrane that surrounds the cytoplasm in prokaryotic and eukaryotic cells. Plasma Membrane,Cytoplasmic Membrane,Cell Membranes,Cytoplasmic Membranes,Membrane, Cell,Membrane, Cytoplasmic,Membrane, Plasma,Membranes, Cell,Membranes, Cytoplasmic,Membranes, Plasma,Plasma Membranes
D002473 Cell Wall The outermost layer of a cell in most PLANTS; BACTERIA; FUNGI; and ALGAE. The cell wall is usually a rigid structure that lies external to the CELL MEMBRANE, and provides a protective barrier against physical or chemical agents. Cell Walls,Wall, Cell,Walls, Cell
D003470 Culture Media Any liquid or solid preparation made specifically for the growth, storage, or transport of microorganisms or other types of cells. The variety of media that exist allow for the culturing of specific microorganisms and cell types, such as differential media, selective media, test media, and defined media. Solid media consist of liquid media that have been solidified with an agent such as AGAR or GELATIN. Media, Culture
D005656 Fungal Proteins Proteins found in any species of fungus. Fungal Gene Products,Fungal Gene Proteins,Fungal Peptides,Gene Products, Fungal,Yeast Proteins,Gene Proteins, Fungal,Peptides, Fungal,Proteins, Fungal
D000074429 Candida parapsilosis A species of MITOSPORIC FUNGI and opportunistic pathogen associated with its ability to form BIOFILMS in catheters and parenteral nutrition IV lines. C. parapsilosis complex includes closely related species C. orthopsilosis; and C. metapsilosis. Mycocandida parapsilosis,Mycotorula parapsilopsis,C. metapsilosis,C. orthopsilosis,C. parapsilosis,C. parapsilosis Complex,Candida metapsilosis,Candida orthopsilosis,Candida parapsilosis Complex,Candida parapsilosis Group
D014357 Trypsin A serine endopeptidase that is formed from TRYPSINOGEN in the pancreas. It is converted into its active form by ENTEROPEPTIDASE in the small intestine. It catalyzes hydrolysis of the carboxyl group of either arginine or lysine. EC 3.4.21.4. Tripcellim,Trypure,beta-Trypsin,beta Trypsin
D020543 Proteome The protein complement of an organism coded for by its genome. Proteomes
D024581 Glyceraldehyde-3-Phosphate Dehydrogenase (Phosphorylating) An NAD-dependent glyceraldehyde-3-phosphate dehydrogenase found in the cytosol of eucaryotes. It catalyses the dehydrogenation and phosphorylation of GLYCERALDEHYDE 3-PHOSPHATE to 3-phospho-D-glyceroyl phosphate, which is an important step in the GLYCOLYSIS pathway. GAPD (Phosphorylating),Glyceraldehyde-3-Phosphate Dehydrogenase (NAD+) (Phosphorylating),Glyceraldehyde-3-Phosphate Dehydrogenases (Phosphorylating),NAD-Dependent Glyceraldehyde-3-phosphate Dehydrogenase,Phosphorylating Glyceraldehyde-3-Phosphate Dehydrogenase,Dehydrogenase, NAD-Dependent Glyceraldehyde-3-phosphate,Dehydrogenase, Phosphorylating Glyceraldehyde-3-Phosphate,Glyceraldehyde-3-Phosphate Dehydrogenase, Phosphorylating,Glyceraldehyde-3-phosphate Dehydrogenase, NAD-Dependent,NAD Dependent Glyceraldehyde 3 phosphate Dehydrogenase,Phosphorylating Glyceraldehyde 3 Phosphate Dehydrogenase

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