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  • 1
    ISSN: 1432-072X
    Keywords: Key words:Candida albicans– Dimorphism – Cell wall – Mannoprotein – EDTA
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract. Hyphal development in Candida albicans was blocked by EDTA. This effect was not due to a general growth inhibition since the chelator did not affect protein and DNA synthesis. Recovery of mycelial growth was observed when EDTA-grown cells were incubated at 37 °C in EDTA-free medium. High-molecular-weight mannoproteins (HMWM) that are mycelium-specific wall components, and particularly a 260-kDa species (HMWM-260), were absent in the wall of cells grown under germination conditions in the presence of EDTA. Synthesis of the HMWM-260 species was not inhibited but its incorporation (secretion) into the wall structure seemed to be blocked in EDTA-treated cells.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-072X
    Keywords: “Slime” variant ; Neurospora ; Chitosomes ; Chitin synthetase ; Secretory vesicles ; Invertase ; Phosphatase ; Membranes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Cells from the “slime” variant of Neurospora crassa were broken in isotonic conditions by use of triethanolamine buffer plus EDTA. After removal of large membranous structures by low-speed centrifugation, chitosomes and secretory vesicles were separated by means of gel filtration, precipitation of membranous contaminants with Concanavalin A, and centrifugation in sucrose or glycerol gradients. Polypeptidic composition of fractions enriched in secretory vesicles or chitosomes was found to be distinct. By these criteria we concluded that chitosomes and secretory vesicles represent different populations of microvesicles. Both microvesicular populations appeared free of endoplasmic reticulum and vacuolar contaminants as demonstrated by determination of appropriate enzymatic markers.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1432-072X
    Keywords: Neurospora crassa ; “Slime” variant ; Cell coat ; Exocellular proteins ; Glycoproteins
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Cells of the “slime” strain of Neurospora crassa synthesize a coherent extracellular material which remains attached to the cell surface, but is released into the liquid medium by shaking. The material was purified and studied by different criteria. By electron microscopy it appears as long wavy sheets which strongly bind concanavalin A, but not wheat germ agglutinin, and maintain their integrity in the absence of structural polysaccharides. Analysis of the purified material revealed that it was free of contaminating membranes; it contained more than 70% protein, 1% neutral sugars (glucose, mannose, fucose and galactose), less than 2% lipids and ca. 4% not-characterized hexosaminelike compounds. Its polypeptide pattern as determined by PAGE was complex. The significance of this material is discussed.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1432-072X
    Keywords: Neurospora crassa ‘Slime” variant ; Cell coat ; Glycoproteins ; Self-assembling
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The proteinaceous extracellular material (PEM) synthesized by the cells of the ‘slime” strain of Neurospora crassa (see Martinez et al. 1989) was solubilized by treatment with urea or guanidine. Removal of these chemicals by dialysis, caused reassembly of the solubilized proteins into material with the same microscopic appearance as the original PEM. Polypeptide patterns from both native and reassembled structures were identical. Dialysis-mediated reassembly of the solubilized proteins appeared to be dependent on both concentration of the soluble macromolecules and time. Gel chromatography of PEM solubilized with different agents revealed two discrete populations of complexes with molecular masses of 1,500 and 500 kDa respectively. These were able to reassemble into lamellar structures with a variable degree of efficiency.
    Type of Medium: Electronic Resource
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