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首页> 外文期刊>Biochemistry >In Vitro Recombination and Inverted Terminal Repeat Binding Activities of the Mcmar1 Transposase
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In Vitro Recombination and Inverted Terminal Repeat Binding Activities of the Mcmar1 Transposase

机译:Mcmar1转座酶的体外重组和反向末端重复结合活性。

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The Mcmar1 mariner element (MLE) presents some intriguing features with two large, perfectlynconserved, 355 bp inverted terminal repeats (ITRs) containing two 28 bp direct repeats (DRs). The presence ofna complete ORF in Mcmar1 makes it possible to explore the transposition of this unusual MLE. Mcmar1ntransposase (MCMAR1) was purified, and in vitro transposition assays showed that it is able to promotenITR-dependent DNA cleavages and recombination events, which correspond to plasmid fusions andntranspositions with imprecise ends. Further analyses indicated that MCMAR1 is able to interact with then355 bp ITR through two DRs: the EDR (external DR) is a high-affinity binding site forMCMAR1, whereasnthe IDR (internal DR) is a low-affinity binding site. The main complex detected within the EDR contained antransposase dimer and only one DNA molecule. We hypothesize that the inability ofMCMAR1 to promotenprecise in vitro transposition events could be due to mutations in its ORF sequence or to the specific featuresnof transposase binding to the ITR. Indeed, the ITRregion spanning fromEDRto IDRresembles aMITE andncould be bent by specific host factors. This suggests that the assembly of the transposition complex is morencomplex than that of those involved in the mobility of the Mos1 and Himar1 mariner elements.
机译:Mcmar1 Mariner元件(MLE)具有两个非常完美的保守保守的355 bp反向末端重复序列(ITR),其中包含两个28 bp直接重复序列(DR),具有一些吸引人的特征。完整的ORF在Mcmar1中的存在使探索这个异常MLE的转位成为可能。纯化了Mcmar1n转座酶(MCMAR1),体外转座分析表明它能够促进nITR依赖性DNA切割和重组事件,这与质粒融合和末端不精确的n转座相对应。进一步的分析表明,MCMAR1能够通过两个DR与355 bp的ITR相互作用:EDR(外部DR)是MCMAR1的高亲和力结合位点,而IDR(内部DR)是低亲和力的结合位点。在EDR中检测到的主要复合物包含一个转座酶二聚体和一个DNA分子。我们假设MCMAR1无法促进精确的体外转座事件可能是由于其ORF序列中的突变或转座酶与ITR结合的特定特征所致。实际上,从EDR到IDR的ITR区域类似于aMITE,并且可能会受到特定宿主因素的影响。这表明,转座复合体的组装要比那些参与Mos1和Himar1水手分子迁移的组装体复杂得多。

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