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• W2144101556 abstract "Pneumocystis carinii pneumonia (PcP) remains among the most prevalent opportunistic infections among AIDS patients. Currently, drugs used clinically for deep mycosis act by binding ergosterol or disrupting its biosynthesis. Although classified as a fungus, P. carinii lacks ergosterol. Instead, the pathogen synthesizes a number of distinct Δ 7 , 24-alkylsterols, despite the abundance of cholesterol, which it can scavenge from the lung alveolus. Thus, the pathogen-specific sterols appear vital for organism survival and proliferation. In the present study, high concentrations of a C 32 sterol were found in human-derived P. carinii hominis . The definitive structural identities of two C-24 alkylated lanosterol compounds, previously not reported for rat-derived P. carinii carinii , were determined by using GLC, MS, and NMR spectroscopy together with the chemical syntheses of authentic standards. The C 31 and C 32 sterols were identified as euphorbol (24-methylenelanost-8-en-3β-ol) and pneumocysterol [(24 Z )-ethylidenelanost-8-en-3β-ol], respectively. The identification of these and other 24-alkylsterols in P. carinii hominis suggests that ( i ) sterol C-24 methyltransferase activities are extraordinarily high in this organism, ( ii ) 24-alkylsterols are important components of the pathogen’s membranes, because the addition of these side groups onto the sterol side chain requires substantial ATP equivalents, and ( iii ) the inefficacy of azole drugs against P. carinii can be explained by the ability of this organism to form 24-alkysterols before demethylation of the lanosterol nucleus. Because mammals cannot form 24-alkylsterols, their biosyntheses in P. carinii are attractive targets for the development of chemotherapeutic strategies against this opportunistic infection." @default.
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• W2144101556 date "1999-01-05" @default.
• W2144101556 modified "2023-10-03" @default.
• W2144101556 title "Pneumocysterol [(24 <i>Z</i> )-ethylidenelanost-8-en-3β-ol], a rare sterol detected in the opportunistic pathogen <i>Pneumocystis carinii hominis</i> : Structural identity and chemical synthesis" @default.
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• W2144101556 doi "https://doi.org/10.1073/pnas.96.1.97" @default.
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