Human Topoisomerase I
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Human Topoisomerase I
Human Topoisomerase I is prepared by overexpressing the enzyme in baculovirus-infected insect cells (Spodoptera frugiperda) and purifying it by methods adapted from Stewart et al., 1996. The enzyme is supplied μl in Dilution Buffer.
Store at -80°C. It is recommended that the enzyme is aliquoted to avoid repeated freeze-thaw cycles.
See technical documents below for more detailed information and lot specific activities.
Technical Documents
Human Topoisomerase I Relaxation Assay Kits
These contain the enzyme and the supercoiled DNA substrate in addition to the Assay and Dilution buffers for relaxation reactions. 1 U of human topo I will relax 0.5 µg supercoiled pBR322 DNA in 30 minutes at 37°C.
Technical Documents
Human Topoisomerase I Assay Kits for Cell Extracts
These kits are designed for assaying cell extracts and partially purified fractions containing human topo I. They contain supercoiled DNA substrate, Assay buffer, Dilution buffer and relaxed DNA marker.
The kit components are based on the standard human topo I assay whch contains 500 ng substrate DNA per assay.
Technical Documents
High / Medium-Throughput Assay Kit - Human Topoisomerase I
The kit is supplied with sufficient human topo I enzyme, plasmid DNA substrate, buffers and other assay components* for 100 assays. The enzyme is supplied at a concentration of 10 U/μl in Dilution Buffer. The kit is also supplied with sufficient wash buffers for one 96-well plate. These buffers are supplied as 20X concentrates and must be diluted with ultra pure water prior to use.
More information about this assay can be found on the "Services" page under "High/Medium Throughput Assay".
Kit issued with limited licence for individual use only.
Patent held by Inspiralis Ltd., Norwich, Norfolk, UK. (Patent No. GB0424953.8, US7838230).
Technical Documents
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1970科家致癌RNA病毒发现种特殊RNA病毒聚合酶,该酶能RNA模板,根据碱基互补原则.程与般病毒转录向相反,故称逆转录,催化程酶称逆转录酶,发现哺乳物胚胎细胞裂淋巴细胞含.
逆转录病毒称携带逆转录酶病毒,先侵入宿主细胞病毒RNA模板,靠酶形DNA环化,合宿主细胞染色体原病毒形式宿主细胞代代传.
HIV（艾滋病病毒）典型逆转录病毒
我是新手。我要开始做实验了，但一开始就碰到了个很大的问题。
我想买个能利用哺乳动物细胞RNA聚合酶将DNA转录成RNA的的质粒，向好几家公司打了电话，但都没有我想要的东西。
没有这个东西，我的实验就只能是蓝图了。哪位战友有办法的，能不能帮帮我？
不胜感激。
ResponseofskeletalmuscleRNApolymerasesIandIItotumourgrowth
BiochimicaetBiophysicaActa(BBA)-GeneStructureandExpression,Volume950,Issue3,7September1988,Pages296-302
GeorgeA.J.Goodlad,CatherineM.Clark
或者有高手知道怎么测也行
最近遇到了实验上的大问题，就是用一步法做RNA的荧光定量PCR时，发现低浓度的做不出来，而DNA是可以的，想请问各位在一步法PCR中有没有什么高见，就是逆转录的Buffer有没有什么需要注意的地方！就是在逆转录酶的最适Buffer和Taq酶的最适Buffer中寻找一个最适的Buffer！
