Structure-activity relationships in aminosterol antibiotics: The effect of stereochemistry at the 7-OH group

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• 作者：Tsemre-Dingel Tessema ; Frank Gassler ; Youheng Shu^&dagger ; ; Stephen Jones^&Dagger ; ; Barry S. Selinsky ; ^{barry.selinsky@villanova.edu}
• 关键词：DOPG ; dioleoylphosphatidylglycerol ; DOPC ; dioleoylphosphatidylcholine ; MIC ; minimum inhibitory concentration ; LUV ; large unilamellar vesicle
• 刊名：Bioorganic and Medicinal Chemistry Letters
• 出版年：2013
• 出版时间：1 June, 2013
• 年：2013
• 卷：23
• 期：11
• 页码：3377-3381
• 全文大小：764 K

文摘

Squalamine and three aminosterol analogs have been shown to inhibit bacterial cell growth and induce lysis of large unilamellar phospholipid vesicles. The analogs differ in the identity of the polyamine attached at C3 of the sterol, and the stereochemistry of a hydroxyl substituent at C7. Analogs with a tetraammonium spermine polyamine are somewhat more active than analogs with a shorter trisammonium spermidine polyamine, and analogs with an axial (¦Á) hydroxyl substituent at C7 are more active than analogs with the corresponding equatorial (¦Â) hydroxyl group. There is some variability noted; the 7¦Â-OH spermine analog is the most active compound against Escherichia coli, but the least effective against Pseudomonas aeruginosa. Lytic activity correlates well with antimicrobial activity of the compounds, but the lytic activity varies with the phospholipid composition of the vesicles.