Structural studies of type I topoisomerases.

Structural studies of type I topoisomerases.
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DOI:
10.1093/nar/gkn1009
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发表时间:
2009-02
影响因子:
14.9
通讯作者:
Mondragón A
Mondragón A
中科院分区:
生物学2区
文献类型:
--
作者:
Baker NM;Rajan R;Mondragón A

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拓扑异构酶是普遍存在于生命的所有三个领域的蛋白质。它们通过一条或两条DNA链上的瞬时断裂来改变DNA的拓扑结构,以允许另一条单链或双链DNA通过断裂。拓扑异构酶分为两种类型:I型酶切割一条DNA链,并在重新密封之前使一条或两条DNA链通过断裂,而II型分子同时切割两条DNA链,并使另一条双链通过断裂,然后重新连接双链断裂。在这里,我们回顾了最近的工作的结构I型酶。这些结构研究提供了原子细节,再加上现有的丰富的生化和生物物理数据,使我们对这些酶的作用机制的理解达到了原子水平。
Topoisomerases are ubiquitous proteins found in all three domains of life. They change the topology of DNA via transient breaks on either one or two of the DNA strands to allow passage of another single or double DNA strand through the break. Topoisomerases are classified into two types: type I enzymes cleave one DNA strand and pass either one or two DNA strands through the break before resealing it, while type II molecules cleave both DNA strands in concert and pass another double strand through the break followed by religation of the double strand break. Here we review recent work on the structure of type I enzymes. These structural studies are providing atomic details that, together with the existing wealth of biochemical and biophysical data, are bringing our understanding of the mechanism of action of these enzymes to the atomic level.
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