Cyclothialidine is a novel DNA gyrase inhibitor produced by Streptomyces filipinensis NR 0484. It was isolated from the culture broth by charcoal adsorption, Diaion HP-21, Amberlite CG-50, DEAE Toyopearl, and Toyopearl HW-40 SF column chromatography. The structure of cyclothialidine was determined to be a unique twelve membered lactone by amino acid analysis and various 2D-NMR experiments. Cyclothialidine inhibited Escherichia coli DNA gyrase with an IC50 of 30 ng/ml.
Cyclothialidine 是一种由丝状链霉菌 NR 0484 产生的新型 DNA 回旋酶
抑制剂。通过木
炭吸附、Diaion HP-21、Amberlite CG-50、
DEAE Toyopearl 和 Toyopearl HW-40 SF 柱层析,从培养液中分离出了环
硫脒。通过
氨基酸分析和各种二维核磁共振实验,确定了环
硫脒是一种独特的十二内酯。环
硫脒抑制大肠杆菌 DNA 回旋酶的 IC50 值为 30 ng/ml。