Pullulan elaboration and differentiation of the resting forms in Aureobasidium pullulans
| Autor: | L. Simon, B. Bouchet, D. J. Gallant, C. Caye-Vaugien |
|---|---|
| Přispěvatelé: | Laboratoire de technologie appliquée à la nutrition, Institut National de la Recherche Agronomique (INRA), ProdInra, Migration |
| Rok vydání: | 1995 |
| Předmět: |
0106 biological sciences
CYTOCHIMIE Immunology Polysaccharide 01 natural sciences Applied Microbiology and Biotechnology Microbiology 03 medical and health sciences chemistry.chemical_compound Biosynthesis 010608 biotechnology Genetics [SDV.MP] Life Sciences [q-bio]/Microbiology and Parasitology Molecular Biology ComputingMilieux_MISCELLANEOUS 030304 developmental biology Glucan chemistry.chemical_classification 0303 health sciences Developmental stage biology Pullulan General Medicine Fungi imperfecti biology.organism_classification Aureobasidium pullulans POLYSACCHARIDE [SDV.MP]Life Sciences [q-bio]/Microbiology and Parasitology chemistry Ultrastructure |
| Zdroj: | Canadian Journal of Microbiology Canadian Journal of Microbiology, NRC Research Press, 1995, 41 (1), pp.35-45 |
| ISSN: | 1480-3275 0008-4166 |
| DOI: | 10.1139/m95-005 |
| Popis: | To identify the cellular forms that are responsible for the synthesis of pullulan produced by Aureobasidium pullulans, we performed cytochemical and ultrastructural localizations of glucan in the cellular forms of this microorganism (blastospores and resting forms). Growth conditions, cell populations, and pullulan production were studied concurrently. Our results are consistent with a model in which the resting forms (swollen cells and chlamydospores) might be primarily involved in this extracellular polysaccharide elaboration. At the cellular level, pullulan production could be the result of three main stages: (i) cell wall thickening and extracellular polysaccharide synthesis by the swollen cell, (ii) fibrillar arrangement of this polysaccharide into pullulan along a capsular network around the chlamydospore, and (iii) subcellular hydrolysis separating the capsule from the periplasmic zone and consequently permitting the solubilization of pullulan in the culture medium. A melanization process in the outer layer of the cell wall and the capsule accompanies these patterns.Key words: Aureobasidium pullulans, capsule, cytochemistry, polysaccharide, pullulan, resting forms. |
| Databáze: | OpenAIRE |
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