首页> 外文期刊>Life sciences >Fluorinated analogues of L-ornithine are powerful inhibitors of ornithine decarboxylase and cell growth of Leishmania infantum promastigotes.
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Fluorinated analogues of L-ornithine are powerful inhibitors of ornithine decarboxylase and cell growth of Leishmania infantum promastigotes.

机译:L-鸟氨酸的氟化类似物是鸟氨酸脱羧酶和婴儿利什曼原虫前鞭毛体细胞生长的强大抑制剂。

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摘要

Fluorinated analogues of L-ornithine have been tested on growth and ornithine decarboxylase arising from L.infantum cytosolic extracts. EC50 values estimated from dose/response curves were 38 microM, 2.62 microM and 4.64 microM for alpha-DFMO, delta-MFMO and delta-MFMOme respectively. Also the inhibition produced by all three compounds was effectively reverted by exogenous putrescine, pointing towards the inhibition of L.infantum ODC. ODC from logarithmic phase cytosolic extracts was physicochemically and kinetically characterized, showing a long half-life (more than 24 h) and a km value for L-ornithine of 98 microM. Finally, the inhibitory effect of fluorinated analogues of L-ornithine was analysed on L.infantum ODC showing a time-dependent irreversible behavior, with Ki values estimated on 125 microM, T1/2 3.5 min for alpha-DFMO; 13.3 microM, T1/2 1.8 min for delta-MFMO and 4.3 microM, T1/2 4 min for delta-MFMOme.
机译:已经对L-鸟氨酸的氟化类似物进行了测试,研究了其生长和从L.infantum胞质提取物中产生的鸟氨酸脱羧酶。根据剂量/反应曲线估计的EC50值分别为alpha-DFMO,δ-MFMO和delta-MFMOme,分别为38 microM,2.62 microM和4.64 microM。而且,所有三种化合物产生的抑制作用都可以被外源腐胺有效地逆转,这表明对L.infantum ODC的抑制作用。对数期胞质提取物的ODC进行了物理化学和动力学表征,显示出较长的半衰期(超过24小时),L-鸟氨酸的km值为98 microM。最后,分析了L-鸟氨酸的氟化类似物对L.infantum ODC的抑制作用,显示了时间依赖性的不可逆行为,Ki值估计为125 microM,T1 / 2为α-DFMO3.5分钟。 13.3 microM,对于MFMF而言,T1 / 2为1.8分钟,对于MFMOme的T1 / 2为4.3分钟,T1 / 2。

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