Date: 26 November 2013
Secondary metabolites, 3D structure: Trivial name – xanthomegnin
Copyright: n/a
Notes:
Species: A. melleus, A. ochraceus, A. sulphureusSystematic name: (8,8′-Bi-1H-naphtho(1,2-c)pyran)-1,1′,7,7′,10,10′-hexone, 3,3′,4,4′-tetrahydro-6,6′-dihydroxy-9,9′-dimethoxy-3,3′-dimethyl-, (3R,3’R)- (8CI) (8,8′-BI-1H-NAPHTHO(2,3-c)PYRAN)-1,1′,6,6′,9,9′-HEXONE, 3,3′,4,4′-TETRAHYDRO-10, (8,8′-Bi-1H-naphtho(2,3-c)pyranMolecular formulae: C30H22O12Molecular weight: 574.488Chemical abstracts number: 1685-91-2Selected references: Durley RC, MacMillan J, Simpson TJ, Glen AT, Turner WB. Fungal products. Part XIII. Xanthomegnin, viomellin, rubrosulphin, and viopurpurin, pigments from Aspergillus sulphureus and Aspergillus melleus. J Chem Soc [Perkin 1]. 1975;(2):163-9. Stack ME, Mislivec PB. Production of xanthomegnin and viomellein by isolates of Aspergillus ochraceus, Penicillium cyclopium, and Penicillium viridicatum. Appl Environ Microbiol. 1978 Oct;36(4):552-4.Toxicity: Doses of 448 mg/kg body-weight in mice caused symptoms of liver damage including jaundice, necrotising cholangitis and other histological alterations. Robbers JE, Hong S, Tuite J, Carlton WW. Production of xanthomegnin and viomellein by species of Aspergillus correlated with mycotoxicosis produced in mice. Appl Environ Microbiol. 1978 Dec;36(6):819-23.
Images library
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The periphery of the fungus ball is deeply eosinophilic because of the deposition of Splendore-Hoeppli material.
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Single fungal ball, moving. Radiographic appearance of a fungus ball, showing movement as the patient’s position changes.
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Oxalate crystals in the cavity wall surrounding an Aspergillus niger fungus ball (H&E, dark field, x 25).
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Aspergilloma patient. Gross pathology appearance of a fungus ball.
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Conidiophores of Aspergillus fumigatus in the mass of the fungal ball surrounded by mycelia (H&E, x 400).
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Aspergillus niger fungal ball. Calcium oxalate crystals in Aspergillus niger fungal ball. Also shown are darkly pigmented, rough-walled conidia associated with Aspergillus niger infection.
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Aspergillus niger fungus ball within an old tuberculous cavern. This patient had diabetes, a disease commonly associated with A. niger infection.
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