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首页> 外文期刊>The Journal of Antibiotics: An International Journal >Topostatin, a novel inhibitor of topoisomerases I and II produced by Thermomonospora alba strain No. 1520 - I. Taxonomy, fermentation, isolation and biological activities
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Topostatin, a novel inhibitor of topoisomerases I and II produced by Thermomonospora alba strain No. 1520 - I. Taxonomy, fermentation, isolation and biological activities

机译:Topostatin,一种新的拓扑异构酶I和II抑制剂,由白热单孢菌1520-I产生。分类学,发酵,分离和生物学活性

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摘要

A novel inhibitor of topoisomerases designated as topostatin was isolated from the culture filtrate of Thermomonospora alba strain No. 1520. Topostatin inhibited the relaxation of supercoiled pBR322 DNA by calf thymus topoisomerase I, and also inhibited the relaxation of supercoiled pBR322 DNA and decatenation of kinetoplast DNA by human placenta topoisomerase II. Topostatin had neither ability to stabilize the cleavable complex nor ability to intercalate into DNA strands. The inhibitor exhibited growth inhibitory activity against the tumor cells (SNB-75 and SNB-78) of central nervous system, but did not exhibit any antimicrobial activity against Gram-positive and Gram-negative bacteria, yeasts and fungi. [References: 32]
机译:从白热单孢菌菌株No.1520的培养滤液中分离出一种新的拓扑异构酶抑制剂,称为topostatin。Topostatin抑制小胸腺拓扑异构酶I抑制超螺旋pBR322 DNA的松弛,也抑制超螺旋pBR322 DNA的松弛和运动塑料DNA的解构。通过人类胎盘拓扑异构酶II。 Topostatin既没有稳定可裂解复合物的能力,也没有插入DNA链的能力。该抑制剂对中枢神经系统的肿瘤细胞(SNB-75和SNB-78)具有生长抑制活性,但对革兰氏阳性和革兰氏阴性细菌,酵母菌和真菌没有任何抗菌活性。 [参考:32]

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