Highly efficient, 5-minute cloning with TOPO®

TOPO® TA in vitro transcription kits utlize the pCR®II-TOPO® TA vector with T7 and SP6 promoters for in vitro RNA transcription and sequencing. TOPO® TA technology works by directly ligating Taq-amplified PCR products in a 5-minute, benchtop reaction yielding up to 95% recombinants.

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 The pCR®II-TOPO® TA vector features:

  • 3´-T overhangs for direct ligation of Taq-amplified PCR products
  • T7 and SP6 promoters for in vitro RNA transcription and sequencing; the vector also contains M13 forward and reverse primer sites for sequencing
  • EcoRI sites flanking the PCR product insertion site for easy excision of inserts
  • Kanamycin and ampicillin resistance genes for your choice of selection in E. coli
  • Easy blue/white colony screening for selection of recombinants

pCR®II-TOPO® TA vector diagram

The pCR®II-TOPO® TA vector

Performance and value

Each TOPO® TA Cloning® for in vitro transcription kit contains linearized and topoisomerase I-activated pCR™II-TOPO vector, Salt Solution, dNTPs, Control Template and Primers, M13 Forward and Reverse Primers, One Shot® Chemically Competent or Electrocomp™ E. coli, S.O.C. Medium, and a supercoiled control plasmid.

Using a proofreading enzyme?

Thermostable polymerases containing extensive 3´ to 5´ exonuclease activity, such as Platinum® Pfx, do not leave 3´ A-overhangs. PCR products generated with Taq polymerase have a high efficiency of cloning in the TOPO® TA subcloning kits because the 3´ A-overhangs are not removed. However, if you use a proofreading polymerase or wish to clone blunt-ended fragments, you can add 3´ A-overhangs by incubating with Taq at the end of your cycling program.

Alternatively, you may want to try Zero Blunt® TOPO® PCR Cloning Kits. These kits offer fast and efficient cloning of blunt-end PCR products generated using thermostable, proofreading polymerases. They also utilize the ccdB gene for positive selection.

Ordering information

Cat. No. Product description Competent cells supplied Number of reactions  
452640 TOPO® TA Cloning® Kit, Dual promotor for in vitro Transcription None 10 Order now
K4600J10 TOPO® TA Cloning® Kit, Dual promotor for in vitro Transcription TOP10 (genotype) 10 Order now
K460001
TOPO® TA Cloning® Kit for in vitro Transcription, with One Shot® TOP10 Chemically Competent E. coli TOP10 (genotype) 25 Order now
K462001
TOPO® TA Cloning® Kit for in vitro Transcription, with One Shot® MAX Efficiency™ DH5α T1 Phage-Resistant Chemically Competent E. coli
MAX Efficiency™ DH5α™ T1R (genotype) 25 Order now
K465001
TOPO® TA Cloning® Kit for in vitro Transcription, with One Shot® TOP10F' Chemically Competent E. coli
TOP10F' (genotype) 25 Order now
K466001 TOPO® TA Cloning® Kit for in vitro Transcription, with One Shot® TOP10 Electrocomp™ E. coli Electrocompetent TOP10 (genotype) 25 Order now
K461020
TOPO® TA Cloning® Kit for in vitro Transcription, with One Shot® Mach1™ T1 Phage-Resistant Chemically Competent E. coli
Mach1™ T1R (genotype)  25 Order Now
K460040
TOPO® TA Cloning® Kit for in vitro Transcription, with One Shot® TOP10 Chemically Competent E. coli
TOP10 (genotype) 50 Order now
K462040 TOPO® TA Cloning® Kit for in vitro Transcription, with One Shot® MAX Efficiency™ DH5α T1 Phage-Resistant Chemically Competent E. coli
MAX Efficiency™ DH5α™ T1R (genotype) 50 Order now
K465040 TOPO® TA Cloning® Kit for in vitro Transcription, with One Shot® TOP10F' Chemically Competent E. coli
TOP10F' (genotype) 50 Order now
K466040 TOPO® TA Cloning® Kit for in vitro Transcription, with One Shot® TOP10 Electrocomp™ E. coli
Electrocompetent TOP10 (genotype) 50 Order now