Zero Blunt™ TOPO™ PCR Cloning Kit, with One Shot™ TOP10 Chemically Competent E. coli cells
Citations & References (4)
Invitrogen™
Zero Blunt™ TOPO™ PCR Cloning Kit, with One Shot™ TOP10 Chemically Competent E. coli 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.
What is the best molar ratio of PCR product:vector to use for TOPO TA cloning? Is there an equation to calculate the quantity to use?
We suggest starting with a molar ratio of 1:1 (insert:vector), with a range of 0.5:1 to 2:1. The quantity used in a TOPO cloning reaction is typically 5-10 ng of a 2 kb PCR product.
Equation:
length of insert (bp)/length of vector (bp) x ng of vector = ng of insert needed for 1:1 (insert:vector ratio)
What is the best ratio of insert:vector to use for cloning? Is there an equation to calculate this?
The optimal ratio is 1:1 insert to vector. Optimization can be done using a ratio of 0.5-2 molecules of insert for every molecule of the vector.
Equation:
length of insert (bp)/length of vector (bp) x ng of vector = ng of insert needed for 1:1 insert:vector ratio
Contribution of acquired carbapenem-hydrolyzing oxacillinases to carbapenem resistance in Acinetobacter baumannii.
Authors:Héritier C, Poirel L, Lambert T, Nordmann P
Journal:Antimicrob Agents Chemother
PubMed ID:16048925
'Carbapenem-hydrolyzing oxacillinases are reported increasingly in Acinetobacter baumannii. Since they hydrolyze carbapenems at low levels, the roles of carbapenem-hydrolyzing oxacillinases OXA-23, OXA-40, and OXA-58 in A. baumannii were determined. The bla(OXA-23), bla(OXA-40), and bla(OXA-58) genes were inserted in broad-host-range plasmid pAT801 and transformed in Escherichia coli DH10B and in A. ... More
A gene network for long-day flowering activates RFT1 encoding a mobile flowering signal in rice.
Authors:Komiya R, Yokoi S, Shimamoto K
Journal:Development
PubMed ID:19762423
'Although some genes that encode sensory or regulatory elements for photoperiodic flowering are conserved between the long-day (LD) plant Arabidopsis thaliana and the short-day (SD) plant rice, the gene networks that control rice flowering, and particularly flowering under LD conditions, are not well understood. We show here that RICE FLOWERING ... More
Estrogen receptor-mediated regulation of microRNA inhibits proliferation of vascular smooth muscle cells.
Authors:Zhao J, Imbrie GA, Baur WE, Iyer LK, Aronovitz MJ, Kershaw TB, Haselmann GM, Lu Q, Karas RH
Journal:Arterioscler Thromb Vasc Biol
PubMed ID:23175673
Estradiol (E2) regulates gene transcription by activating estrogen receptor-a and estrogen receptor-ß. Many of the genes regulated by E2 via estrogen receptors are repressed, yet the molecular mechanisms that mediate E2-induced gene repression are currently unknown. We hypothesized that E2, acting through estrogen receptors, regulates expression of microRNAs (miRs) leading ... More
Transmission of human immunodeficiency virus type 1 from a patient who developed AIDS to an elite suppressor.
Authors:Bailey JR, O'Connell K, Yang HC, Han Y, Xu J, Jilek B, Williams TM, Ray SC, Siliciano RF, Blankson JN
Journal:J Virol
PubMed ID:18495769
Elite suppressors (ES) are untreated human immunodeficiency virus type 1 (HIV-1)-infected patients who maintain viral loads of <50 copies/ml. The mechanisms involved in this control of viral replication remain unclear. Prior studies suggested that these patients, as well as long-term nonprogressors, are infected with defective HIV-1 variants. Other reports have ... More