Pyridines and Pyrimidines Mediating Activity against an Efflux-Negative Strain of
<i>Candida albicans</i>
through Putative Inhibition of Lanosterol Demethylase
作者:Ed T. Buurman、April E. Blodgett、Kenneth G. Hull、Daniel Carcanague
DOI:10.1128/aac.48.1.313-318.2004
日期:2004.1
ml(-1)), suggesting that they are efficiently removed from wild-type cells. Quantitative analysis of sterol intermediates that accumulated during growth inhibition revealed the accumulation of lanosterol at the expense of ergosterol. Furthermore, a clear correlation was found between the 50% inhibitory concentration at which the sterol profile was altered and the antifungal activity, measured as the MIC.
酿酒酵母中麦角甾醇生物合成的第一步是由ERG10编码的乙酰乙酰辅酶A硫解酶缩合两个乙酰辅酶A(乙酰辅酶A)部分。固醇途径的抑制导致ERG10转录的反馈激活。一种基于细胞的报告基因分析法,其中增加的ERG10转录导致升高的特异性β-半乳糖苷酶活性,被用于寻找麦角固醇生物合成的新型抑制剂,这些抑制剂可作为新型抗真菌剂开发的化学起点。以这种方式鉴定出的一类吡啶和嘧啶对主要的真菌病原白色念珠菌(MIC> 64 micro g。ml(-1))没有可检测的活性。但是,C。缺少Cdr1p和Cdr2p外排泵的白色念珠菌对化合物敏感(MIC范围从2到64微克。ml(-1)),表明它们已从野生型细胞中有效去除。在生长抑制过程中积累的固醇中间体的定量分析显示,羊毛甾醇的积累以麦角固醇为代价。此外,发现固醇谱改变的50%抑制浓度与以MIC为单位测得的抗真菌活性之间存在明显的相关性。这一发现强烈表明,抑制生长是由麦