Structural basis for topological regulation of Tn3 resolvase.

Structural basis for topological regulation of Tn3 resolvase.
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DOI:
10.1093/nar/gkac733
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发表时间:
2023-02-22
影响因子:
14.9
通讯作者:
Rice, Phoebe A.
Rice, Phoebe A.
中科院分区:
生物学2区
文献类型:
--
作者:
Montano, Sherwin P.;Rowland, Sally-J;Fuller, James R.;Burke, Mary E.;MacDonald, Alasdair, I;Boocock, Martin R.;Stark, W. Marshall;Rice, Phoebe A.

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位点特异性DNA重组酶发挥着多种生物学作用,通常与抗生素耐药性的传播有关,也是有用的合成生物学工具。最简单的位点特异性重组系统将重组任何两个同源位点,而不管上下文如何。其他系统已经进化出复杂的机制,通常感知DNA拓扑结构,以确保只产生多种可能的重组产物中的一种。来自Tn 3和γδ转座子的密切相关的解离酶在历史上充当了通过DNA拓扑结构调节重组酶活性的范例。然而,尽管有许多建议,模型的多亚基蛋白质-DNA复合物(称为突触体),执行这种调节一直不令人满意,由于缺乏实验的限制和不完全一致的实验数据。在这里,我们提出了新的结构和生化数据,导致一个新的,详细的模型的Tn 3突触体,并讨论它如何利用DNA拓扑结构来调节重组酶的酶活性。利用DNA拓扑结构通过Tn 3解离酶调节位点特异性重组的蛋白质-DNA复合物模型。
Site-specific DNA recombinases play a variety of biological roles, often related to the dissemination of antibiotic resistance, and are also useful synthetic biology tools. The simplest site-specific recombination systems will recombine any two cognate sites regardless of context. Other systems have evolved elaborate mechanisms, often sensing DNA topology, to ensure that only one of multiple possible recombination products is produced. The closely related resolvases from the Tn3 and γδ transposons have historically served as paradigms for the regulation of recombinase activity by DNA topology. However, despite many proposals, models of the multi-subunit protein–DNA complex (termed the synaptosome) that enforces this regulation have been unsatisfying due to a lack of experimental constraints and incomplete concordance with experimental data. Here, we present new structural and biochemical data that lead to a new, detailed model of the Tn3 synaptosome, and discuss how it harnesses DNA topology to regulate the enzymatic activity of the recombinase. Model of the protein-DNA complex that harnesses DNA topology to regulate site-specific recombination by Tn3 resolvase.
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影响因子: --
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