Synthesis of full length and truncated microcin B17 analogues as DNA gyrase poisons.

Synthesis of full length and truncated microcin B17 analogues as DNA gyrase poisons.
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作为 DNA 旋转酶毒物的全长和截短的小菌素 B17 类似物的合成。

DOI:
10.1039/c3ob42516a
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发表时间:
2014
影响因子:
3.2
通讯作者:
Thompson RE
Thompson RE
中科院分区:
化学3区
文献类型:
--
作者:
Thompson RE

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Microcin B17(MccB 17)是一种后修饰的肽,含有中断肽骨架的噻唑和恶唑杂环。MccB 17能够通过稳定促旋酶-DNA切割复合物来毒害DNA促旋酶,因此引起了人们的极大关注。使用Fmoc策略固相肽合成和溶液相片段组装的组合,我们已经准备了一个库的全长和截短的MccB 17类似物,以研究关键的结构要求的促旋酶中毒活性。缺乏全长序列的富含甘氨酸的N-末端部分的合成肽显示出强的促旋酶-DNA切割复合物的稳定性,相对于全长序列具有增加的效力。然而,这种截断导致这些类似物的抗菌活性相对于其全长对应物降低,表明天然产物的N-末端区域对细胞摄取的潜在作用。
Microcin B17 (MccB17) is a post-translationally modified peptide containing thiazole and oxazole heterocycles that interrupt the peptide backbone. MccB17 is capable of poisoning DNA gyrase through stabilization of the gyrase-DNA cleavage complex and has therefore attracted significant attention. Using a combination of Fmoc-strategy solid-phase peptide synthesis and solution-phase fragment assembly we have prepared a library of full-length and truncated MccB17 analogues to investigate key structural requirements for gyrase-poisoning activity. Synthetic peptides lacking the glycine-rich N-terminal portion of the full-length sequence showed strong stabilization of the gyrase-DNA cleavage complex with increased potency relative to the full-length sequences. This truncation, however, led to a decrease in antibacterial activity of these analogues relative to their full-length counterparts indicating a potential role of the N-terminal region of the natural product for cellular uptake.
来自肠杆菌的一类新的低分子量抗生素。
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