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Dream Taq DNA polymerase

Company: Thermo Scientific
Catalog#: EP0701
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Characterize the Interaction of the DNA Helicase PriA with the Stalled DNA Replication Fork Using Atomic Force Microscopy
Author:
Date:
2021-03-05
[Abstract]  

In bacteria, the restart of stalled DNA replication forks requires the DNA helicase PriA. PriA can recognize and remodel abandoned DNA replication forks, unwind DNA in the 3'-to-5' direction, and facilitate the loading of the helicase DnaB onto the DNA to restart replication. ssDNA-binding protein (SSB) is typically present at the abandoned forks, protecting the ssDNA from nucleases. Research that is based on the assays for junction dissociation, surface plasmon resonance, single-molecule FRET, and x-ray crystal structure has revealed the helicase activity of PriA, the SSB-PriA interaction, and structural information of PriA helicase. Here, we used Atomic Force Microscopy (AFM) to visualize the interaction between PriA and DNA substrates with or without SSB in the absence of ATP to

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[摘要]  [摘要]在细菌中,停滞的DNA复制叉的重新启动需要DN A解旋酶PriA 。PriA可以识别并重塑废弃的DNA复制叉,在3'到5'方向展开DNA,并促进解旋酶DnaB加载到DNA上以重新开始复制​​。ssDNA结合蛋白(SSB)通常存在于废弃的叉子上,从而保护ssDNA免受核酸酶的破坏。该研究是基于所述测定法离解结,表面等离振子共振,单分子FRET,和x射线晶体结构已经揭示的解旋酶活性PRIA ,SSB- PriA相互作用以及PriA解旋酶的结构信息。在这里,我们使用原子力显微镜(AFM)可视化了在不存在ATP的情况下在有或没有SSB的情况下PriA和带有或不带有SSB的DNA底物之间的相互作用,以描绘PriA在其ATP催化的DNA解链反应之前的底物识别模式。该协议描述了获取高分辨率AFM图像的步骤以及数据分析和表示的细节。

[背景]当DNA复制遇到障碍或断裂时,需要对其进行修复并随后重新启动(Kogoma,1997; Cox等,2000; McGlynn和Lloyd,2002;G abbai和Marians,2010; Michel等,2018)。 )。在细菌中,DNA解旋酶PRIA通过识别废弃DNA复制叉,从而便于重新组装的介导这一过程复制体的解旋酶和装载DNAB (Wickner和赫维茨,1975; Zavitz和Marians,1992; ...

Whole-genome Identification of Transcriptional Start Sites by Differential RNA-seq in Bacteria
Author:
Date:
2020-09-20
[Abstract]  Gene transcription in bacteria often starts some nucleotides upstream of the start codon. Identifying the specific Transcriptional Start Site (TSS) is essential for genetic manipulation, as in many cases upstream of the start codon there are sequence elements that are involved in gene expression regulation. Taken into account the classical gene structure, we are able to identify two kinds of transcriptional start site: primary and secondary. A primary transcriptional start site is located some nucleotides upstream of the translational start site, while a secondary transcriptional start site is located within the gene encoding sequence.

Here, we present a step by step protocol for genome-wide transcriptional start sites determination by differential RNA-sequencing (dRNA-seq) ...
[摘要]  [摘要] 细菌中的基因转录通常起始于起始密码子上游的一些核苷酸。识别SPE cific Ť ranscriptional 小号挞小号ITE (TSS)为遗传操作必需的,因为在许多情况下,起始密码子上游有中涉及的基因表达调控序列元件。考虑到经典的基因结构,我们能够鉴定出两种转录起始位点:一级和二级。主要转录起始位点位于翻译起始位点上游的一些核苷酸上,而次要转录起始位点位于基因编码序列内。

这里,我们提出一步步协议全基因组吨ranscriptional 小号馅饼小号ITES d etermination通过差RNA测序(DRNA 使用肠道病原体-SEQ)福氏痢疾杆菌血清型菌株5A作为M90T模型。但是,该方法可以用于选择的任何其他细菌物种。第一步,使用热酚法从细菌培养物中纯化总RNA。核糖体RNA(rRNA)是使用商业试剂盒通过杂交探针特异性去除的。然后准备一个富含5'- 一磷酸依赖性核酸外切酶(TEX)处理的,富含初级转录本的RNA文库,用于与未进行TEX处理的文库进行比较,然后连接已知序列的RNA接头衔接子,从而确定具有单核苷酸精度的TSS。最后,对RNA进行处理以制备Illumina测序文库,并按购买的服务进行测序。通过内部生物信息学分析鉴定TSS。

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