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• W1984417830 abstract "Summary Recently, it has been demonstrated that the opportunistic fungal pathogen Cryptococcus neoformans can synthesize authentic immunomodulatory prostaglandins. The mechanism by which this takes place is unclear as there is no cyclooxygenase homologue in the cryptococcal genome. In this study, we show that cryptococcal production of both PGE 2 and PGF 2α can be chemically inhibited by caffeic acid, resveratrol and nordihydroguaiaretic acid. These polyphenolic molecules are frequently used as inhibitors of lipoxygenase enzymes; however, blast searches of the cryptococcal genome were unable to identify any homologues of mammalian, plant or fungal lipoxygenases. Next we investigated cryptococcal laccase, an enzyme known to bind polyphenols, and found that either antibody depletion or genetic deletion of the primary cryptococcal laccase ( lac1 Δ) resulted in a loss of cryptococcal prostaglandin production. To determine how laccase is involved, we tested recombinant laccase activity on the prostaglandin precursors, arachidonic acid (AA), PGG 2 and PGH 2 . Using mass spectroscopy we determined that recombinant Lac1 does not modify AA or PGH 2 , but does have a marked activity toward PGG 2 converting it to PGE 2 and 15‐keto‐PGE 2 . These data demonstrate a critical role for laccase in cryptococcal prostaglandin production, and provides insight into a new and unique fungal prostaglandin pathway." @default.
• W1984417830 created "2016-06-24" @default.
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• W1984417830 date "2008-04-29" @default.
• W1984417830 modified "2023-10-11" @default.
• W1984417830 title "The role of laccase in prostaglandin production by<i>Cryptococcus neoformans</i>" @default.
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• W1984417830 doi "https://doi.org/10.1111/j.1365-2958.2008.06245.x" @default.
• W1984417830 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3973538" @default.
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