Zero Blunt™ TOPO™ PCR Cloning Kit, without competent cells
Citations & References (2)
Invitrogen™
Zero Blunt™ TOPO™ PCR Cloning Kit, without competent cells
Zero Blunt™ TOPO™ PCRクローニングキットは、プルーフリーディング耐熱性ポリメラーゼで増幅された平滑末端PCR産物をプラスミドベクターに直接挿入するための、高効率な5分間ワンステップクローニング戦略(「TOPO™クローニング」)を提供します。各キットには、ポジティブセレクション用のccdB遺伝子を含むZero詳細を見る
What is the difference between the pCR2.1-TOPO and pCR4-TOPO vectors?
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.
What is the difference between the pCR2.1-TOPO and pCRII-TOPO vectors?
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.
Your TOPO cloning kits contain a control template and control primers. Can I obtain the sequence of the control template?
The sequence of the control template is proprietary.
I'm seeing a lot of vector-only colonies when I try to perform a negative control reaction using vector only (no insert) for a TOPO reaction. Is my TOPO vector re-ligating?
Using the vector only for transformation is not a recommended negative control. The process of TOPO-adaptation is not a 100% process, therefore, there will be vector only present in your mix, and colonies will be obtained.
I'm trying to clone in my phosphorylated PCR product into a TOPO vector, and I'm getting no colonies. However, when I clone the same product into a TA vector, everything works perfectly. Why is this?
Phosphorylated products can be TA cloned but not TOPO cloned. This is because the necessary phosphate group is contained within the topoisomerase-DNA intermediate complex of the vector. TOPO vectors have a 3' phosphate to which topoisomerase is covalently bound and a 5' phosphate. Non-TOPO linear vectors (TA and Blunt) have a 3' OH and a 5' phosphate. Phosphorylated products should be phosphatased (CIP) before TOPO cloning.
Cloning and expression of ntnD, encoding a novel NAD(P)(+)-independent 4-nitrobenzyl alcohol dehydrogenase from Pseudomonas sp. Strain TW3.
Authors:James KD, Hughes MA, Williams PA
Journal:J Bacteriol
PubMed ID:10809692
Pseudomonas sp. strain TW3 is able to metabolize 4-nitrotoluene to 4-nitrobenzoate and toluene to benzoate aerobically via a route analogous to the upper pathway of the TOL plasmids. We report the cloning and characterization of a benzyl alcohol dehydrogenase gene (ntnD) which encodes the enzyme for the catabolism of 4-nitrobenzyl ... More
Expression and characterization of a Bifidobacterium adolescentis beta-mannanase carrying mannan-binding and cell association motifs.
Authors:Kulcinskaja E, Rosengren A, Ibrahim R, Kolenová K, Stålbrand H
Journal:Appl Environ Microbiol
PubMed ID:23064345
The gene encoding ß-mannanase (EC 3.2.1.78) BaMan26A from the bacterium Bifidobacterium adolescentis (living in the human gut) was cloned and the gene product characterized. The enzyme was found to be modular and to contain a putative signal peptide. It possesses a catalytic module of the glycoside hydrolase family 26, a ... More