Mechanism of azole antifungal activity as determined by liquid chromatographic/mass spectrometric monitoring of ergosterol biosynthesis

被引：40

作者：

Heimark, L ^{[1
]}

Shipkova, P ^{[1
]}

Greene, J ^{[1
]}

Munayyer, H ^{[1
]}

Yarosh-Tomaine, T ^{[1
]}

DiDomenico, B ^{[1
]}

Hare, R ^{[1
]}

Pramanik, BN ^{[1
]}

机构：

[1] Schering Plough Corp, Res Inst, Kenilworth, NJ 07033 USA

来源：

JOURNAL OF MASS SPECTROMETRY | 2002年 / 37卷 / 03期

关键词：

Posaconazole; fungal sterols; liquid chromatography/mass spectrometry; particle beam; lanosterol; 14; alpha-demethylase;

D O I：

10.1002/jms.280

中图分类号：

Q5 [生物化学];

学科分类号：

071010 ; 081704 ;

摘要：

A liquid chromatography/mass spectrometry (LC/MS) method for separation and characterization of ergosterol biosynthetic precursors was developed to study the effect of Posaconazole on sterol biosynthesis in fungi. Ergosterol biosynthetic precursors were characterized from their electron ionization mass spectra acquired by a normal-phase chromatography, particle beam LC/MS method. Fragment ions resulting from cleavage across the D-ring and an abundant M-15 fragment ion were diagnostic for methyl substitution at C-4 and C-14. Comparison of the sterol profile in control and treated Candida albicans incubations showed depletion of ergosterol and accumulation of C-4 and C-14 methyl-substituted sterols following treatment with Posaconazole. These C-4 and C-14 methyl sterols are known to be incapable of sustaining cell growth. The results demonstrate that Posaconazole exerts its antifungal activity by inhibition of ergosterol biosynthesis. Furthermore, Posaconazole appears to disrupt ergosterol biosynthesis by inhibition of lanosterol 14alpha-demethylase. Copyright (C) 2002 John Wiley Sons, Ltd.

引用

页码：265 / 269

页数：5

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