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View additional product information for Zero Blunt™ TOPO™ PCR Cloning Kit, with pCR™-Blunt II-TOPO™ Vector, One Shot™ TOP10 Chemically Competent E. coli, and PureLink™ Quick Plasmid Miniprep Kit - FAQs (K280002)
12 product FAQs found
两个载体的骨架非常相似。主要的不同在于pCR4-TOPO载体测序引物位点距离PCR产物插入位点仅33 bp。这使得对插入序列进行测序时需要读取的载体序列能最小化，从而使pCR4-TOPO载体非常适合进行测序应用。
两个载体的骨架非常相似。主要的不同在于pCRII-TOPO 载体是一个双启动子载体，包含SP6和T7启动子用于体外转录/测序，而 pCR2.1-TOPO仅包含T7启动子用于体外转录/测序。两个载体均含有M13 正向和反向引物位点用于测序或PCR检测。
对照模板的序列是受专利保护的。
不，你不能用pCR-Blunt 或pCR-Blunt-TOPO载体克隆使用Taq DNA聚合酶扩增而来的PCR产物。 pCR-Blunt载体被制备为平末端以接受平末端片段。因为Taq DNA聚合酶的末端转移活性，该酶产生的PCR产物带有3’-A突起。为了将这些PCR产物克隆进pCR-Blunt，你需要将它们的末端抹平（这通常是一个低效的过程）。我们的TA Cloning试剂盒或TOPO TA Cloning试剂盒对于克隆Taq酶生成的PCR产物来说是更好的选择。 TA Cloning试剂盒包含带有3’-T突起的线性化载体用于高效连接Taq酶生成的PCR产物，无需额外操作。
1. 是的，TOPO TA Cloning 和Zero Blunt cloning vectors可以用于体外转录。这些载体含有的T7、SP6 或T3启动子是活跃的噬菌体启动子，相应的聚合酶将从这些启动子转录RNA。
2. 这些载体通常不建议用于体外翻译，因为这些载体的启动子下游（3’端）大多含有一个或多个翻译起始信号（ATG）。ATG在多克隆位点之内，这可能会干扰在插入片段中开放阅读框的翻译。
The vector backbones for both of these vectors are very similar. The main difference is that the pCR4-TOPO vector has sequencing primer sites located as close as 33 base pairs from the PCR product insertion site. This minimizes the amount of vector DNA sequence that needs to be read before reaching the sequence of the insert, making the pCR4-TOPO vector very useful for sequencing applications.
The vector backbones for both of these vectors are very similar. The main difference is that the pCRII-TOPO vector is a dual promoter vector, containing the SP6 and T7 promoters for in vitro transcription/sequencing, whereas the pCR2.1-TOPO vector contains only the T7 promoter for in vitro transcription/sequencing. Both vectors contain the M13 Forward and Reverse primer sites for sequencing or PCR screening.
The sequence of the control template is proprietary.
For the Directional TOPO Cloning Vectors, a PCR product must be generated by a proofreading enzyme to create a blunt product. Pfx50 or Accuprime Pfx and Accuprime Pfx Supermix from Thermo Fisher Scientific are recommended for use.
When cloning a Pfx-amplified PCR product, the insert to vector ratio is an important consideration. The PCR product generally needs to be diluted since Pfx generates a high concentration of product and using too much insert DNA can hamper the TOPO reaction. A 1:1 molar ratio of vector to insert (or about 2-10ng of insert) is recommended.
No you cannot use pCR-Blunt or pCR-Blunt-TOPO vector to clone PCR products amplified with Taq DNA polymerase. The pCR-Blunt vector is prepared with blunt ends to accept blunt-ended fragments. Due to the terminal transferase activity of Taq DNA polymerase, PCR products amplified with this enzyme have 3'-A overhangs. In order to clone these products into pCR-Blunt, you would need to polish the ends to make them blunt (which usually is not an efficient process). Our TA Cloning Kits or TOPO TA Cloning kits are a better choice for cloning Taq-generated PCR products. TA Cloning kits include a linearized vector with 3'-T overhangs for efficient ligation of Taq-generated PCR products without additional manipulation.
Assuming that the primer is at a 50 nM final concentration and 50 mM final salt concentration, the melting temperatures are: M13 Forward (-20) Primer = 52.7 and the M13 Reverse Primer = 45.3. For use in the control PCR reaction we recommend using an annealing temperature of 56C.
Yes, the TOPO TA cloning and Zero Blunt cloning vectors can be used for in vitro transcription. The T7, SP6, and T3 promoters contained in these vectors are active phage promoters, and the corresponding polymerases will transcribe RNA from these promoters.
These vectors are not generally recommended for in vitro translation because most of these vectors contain one or more translational initiation signals (ATG) downstream (3’) of the promoters contained in them, within the multiple cloning sites, which may interfere with attempts to translate an open reading frame in the insert.