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    Author(s): William R. Kenealy; Diane M. Dietrich
    Date: 2004
    Source: Enzyme and microbial technology. Vol. 34 (2004): Pages 490-498.
    Publication Series: Miscellaneous Publication
    PDF: View PDF  (249 KB)

    Description

    Phanerochaete chrysosporium BKM-F-1767 produced small amounts of ethanol from glucose, mannose, cellobiose, maltose and sucrose when grown with a limited O2 supply in sealed bottles. Under O 2 -limited growth on glucose, low levels of acetate or oxalate were produced when nitrogen was in excess or limited, respectively. Alcohol dehydrogenase activity (15 nmol/min/mg extract protein) was detected in cell extracts made from ethanol producing cells. The low levels of fermentative enzymes and products indicate that P. chrysosporium does not grow fermentatively, but probably survives transient oxygen limitation by fermentation. Analysis of the genome sequence has indicated multiple alcohol dehydrogenase genes that resemble ADH I and ADH II. Fermentation experiments conducted with 1-13 C-and 2-13 C-glucose produced 2-13 C- and 1- 13 C-ethanol, respectively. Under conditions of 1- 13 C-glucose incubation with nitrogen in excess 2-13 C- acetate was also detected. The labeling pattern is consistent with ethanol formation by glycolysis and alcohol dehydrogenase. Ethanol was detected in aspen chips aerobically colonized by P. chrysosporium only when the culture was purged with nitrogen gas. The data indicate that P. chrysosporium is able to ferment components of wood when the supply of 02 is depleted.

    Publication Notes

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    Citation

    Kenealy, William R.; Dietrich, Diane M. 2004. Growth and fermentation responses of Phanerochaete chrysosporium to O2 limitation. Enzyme and microbial technology. Vol. 34 (2004): Pages 490-498.

    Keywords

    Phanerochaete chrysosporium, fermentation, wood, ethanol, oxalate, white-rot fungi

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