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Stratilová B, Klaudiny J, Řehulka P, Stratilová E, Mészárosová C, Garajová S, Pavlatovská B, Řehulková H, Kozmon S, Šesták S, Firáková Z, Vadkertiová R. Characterization of a long-chain α-galactosidase from Papiliotrema flavescens. World J Microbiol Biotechnol 2018; 34:19. [PMID: 29302817 DOI: 10.1007/s11274-017-2403-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2017] [Accepted: 12/22/2017] [Indexed: 11/30/2022]
Abstract
α-Galactosidases are assigned to the class of hydrolases and the subclass of glycoside hydrolases (GHs). They belong to six GH families and include the only characterized α-galactosidases from yeasts (GH 27, Saccharomyces cerevisiae). The present study focuses on an investigation of the lactose-inducible α-galactosidase produced by Papiliotrema flavescens. The enzyme was present on the surface of cells and in the cytosol. Its temperature optimum was about 60 °C and the pH optimum was 4.8; the pH stability ranged from 3.2 to 6.6. This α-galactosidase also exhibited transglycosylation activity. The cytosol α-galactosidase with a molecular weight about 110 kDa, was purified using a combination of liquid chromatography techniques. Three intramolecular peptides were determined by the partial structural analysis of the sequences of the protein isolated, using MALDI-TOF/TOF mass spectrometry. The data obtained recognized the first yeast α-galactosidase, which belongs to the GH 36 family. The bioinformatics analysis and homology modeling of a 210 amino acids long C-terminal sequence (derived from cDNA) confirmed the correctness of these findings. The study was also supplemented by the screening of capsular cryptococcal yeasts, which produce the surface lactose-inducible α- and β-galactosidases. The production of the lactose-inducible α-galactosidases was not found to be a general feature within the yeast strains examined and, therefore, the existing hypothesis on the general function of this enzyme in cryptococcal capsule rearrangement cannot be confirmed.
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Affiliation(s)
- Barbora Stratilová
- Institute of Chemistry, Center for Glycomics, Slovak Academy of Sciences, Dúbravská cesta 9, 845 38, Bratislava, Slovakia.,Department of Physical and Theoretical Chemistry, Faculty of Natural Sciences, Comenius University in Bratislava, Mlynská dolina, Ilkovičova 6, 842 15, Bratislava, Slovakia
| | - Jaroslav Klaudiny
- Institute of Chemistry, Center for Glycomics, Slovak Academy of Sciences, Dúbravská cesta 9, 845 38, Bratislava, Slovakia
| | - Pavel Řehulka
- Institute of Molecular Pathology, Faculty of Military Health Sciences, University of Defence, Třebešská 1575, 50001, Hradec Králové, Czech Republic
| | - Eva Stratilová
- Institute of Chemistry, Center for Glycomics, Slovak Academy of Sciences, Dúbravská cesta 9, 845 38, Bratislava, Slovakia
| | - Csilla Mészárosová
- Institute of Chemistry, Center for Glycomics, Slovak Academy of Sciences, Dúbravská cesta 9, 845 38, Bratislava, Slovakia
| | - Soňa Garajová
- Institute of Chemistry, Center for Glycomics, Slovak Academy of Sciences, Dúbravská cesta 9, 845 38, Bratislava, Slovakia
| | - Barbora Pavlatovská
- Institute of Food Chemistry and Biotechnology, Faculty of Chemistry, Brno University of Technology, Purkyňova 118, 612 00, Brno, Czech Republic
| | - Helena Řehulková
- Institute of Molecular Pathology, Faculty of Military Health Sciences, University of Defence, Třebešská 1575, 50001, Hradec Králové, Czech Republic
| | - Stanislav Kozmon
- Institute of Chemistry, Center for Glycomics, Slovak Academy of Sciences, Dúbravská cesta 9, 845 38, Bratislava, Slovakia
| | - Sergej Šesták
- Institute of Chemistry, Center for Glycomics, Slovak Academy of Sciences, Dúbravská cesta 9, 845 38, Bratislava, Slovakia
| | - Zuzana Firáková
- Institute of Chemistry, Center for Glycomics, Slovak Academy of Sciences, Dúbravská cesta 9, 845 38, Bratislava, Slovakia
| | - Renáta Vadkertiová
- Institute of Chemistry, Center for Glycomics, Slovak Academy of Sciences, Dúbravská cesta 9, 845 38, Bratislava, Slovakia.
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Kopecká M, Golubev W, Ramíková V, Klemová D, Ilkovics L. Ultrastructural characteristics and variability of vegetative reproduction in Fellomyces penicillatus. J Basic Microbiol 2011; 52:531-8. [PMID: 22144013 DOI: 10.1002/jobm.201100405] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2011] [Accepted: 09/26/2011] [Indexed: 11/09/2022]
Abstract
The yeast strains VKM Y-2977 and VKM Y-2978, derived from the isolate Pa-202, were examined for their physiological properties and mycocin sensitivities and studied by light, phase-contrast, fluorescence, transmission and scanning electron microscopy. The cells of the first strain produced long stalk-like conidiophores, whereas the cells of the second one had the appearance of a typical budding yeast under the light microscope. Transmission and scanning electron microscopy showed the formation of stalk-like conidiophores and long necks in VKM Y-2977, similar in appearance to Fellomyces fuzhouensis. The actin cytoskeleton, microtubules and nuclei were similar as well, but due to presence of a capsule, they were not clearly visible. The second isolate, VKM Y-2978, had very short stalk-like conidiophores, and the neck, microtubules and actin cables were shorter as well. The actin patches, actin cables, and microtubules were similar in VKM Y-2977 and VKM Y-2978 and not clearly visible. The physiological characteristics and mycocin sensitivity patterns, together with the microscopic structures and ultrastructures, led us to conclude that both strains belong to Fellomyces penicillatus, even though they differ in the lengths of their stalk-like conidiophores and necks.
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Affiliation(s)
- Marie Kopecká
- Department of Biology, Masaryk University, Brno, Czech Republic.
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