Thermo Scientific™

CloneJET PCR Cloning Kit

Catalog number:  K1231

Related applications:

PCR Cloning

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Thermo Scientific CloneJET PCR Cloning Kit, also available with DH10B cells (K123120), is an advanced positive selection system for high-efficiency cloning of PCR products generated with any thermostable DNA polymerase. Any other blunt or sticky-end DNA fragment can be cloned. It is ideal for phosphorylated or non-phosphorylated DNA fragments. Ligation into the included positive selection vector takes only 5 minutes, yielding more than 99% recombinant clones. Blunt-ended PCR products generated with a proofreading enzyme are ligated directly into the cloning vector.

PCR products generated either with non-proofreading DNA polymerases or mixtures of DNA polymerases are blunted prior to ligation in 5 minutes with the thermostable DNA Blunting Enzyme provided with the kit. All common laboratory E. coli strains can be directly transformed with the ligation product.


The CloneJET PCR Cloning Kit contains a novel, ready-to-use positive selection cloning vector pJET1.2/blunt. The vector contains a lethal restriction enzyme gene that is disrupted by ligation of a DNA insert into the cloning site. As a result, only bacterial cells with recombinant plasmids are able to form colonies. Recircularized pJET1.2/blunt vector molecules lacking an insert express a lethal restriction enzyme, which kills the host E. coli cell after transformation. This positive selection drastically accelerates the process of colony screening and eliminates additional costs required for blue/white selection.

For convenience in mapping and manipulation of the insert, the pJET1.2/blunt cloning vector multiple cloning site contains two BglII recognition sequences that flank the insertion site. In addition, the vector contains a T7 promoter for in vitro and in vivo transcription as well as sequencing of the insert.


Fast—PCR cloning in only 5 minutes
Highest efficiency – > 99% of positive clones
No cloning background—positive selection vector
Versatile—ideal for blunt-end or sticky-end cloning
Economical—no expensive blue/white screening


• Cloning of blunt-end or 3'-dA tailed PCR products up to 10 kb
• Cloning of DNA fragments generated by restriction enzymes
• Sequencing of cloned DNA
in vitro and in vivo transcription of cloned inserts from the T7 promoter


• pJET1.2/blunt Cloning Vector
T4 DNA Ligase
• 2X Reaction Buffer
• DNA Blunting Enzyme
• pJET1.2 Forward Sequencing Primer (5'-CGACTCACTATAGGGAGAGCGGC-3')
• pJET1.2 Reverse Sequencing Primer (5'-AAGAACATCGATTTTCCATGGCAG-3')
• Control PCR Product
Water, nuclease-free
• Detailed Protocol

Prior to electroporation, always column-purify the ligation mixture using e.g. GeneJET PCR Purification Kit #K0701 or chloroform to extract it. Electroporation is inhibited by the presence of proteins and salts in the mixture.

Related Products
CloneJET PCR Cloning Kit
Fast DNA End Repair Kit
For Research Use Only. Not for use in diagnostic procedures.


Bacterial or Yeast Strain: Not Included
Vector: pJET1.2/blunt
Quantity: 20 reactions
Antibiotic Resistance Bacterial: Ampicillin (AmpR)
Cloning Method: Restriction Enzyme ⁄ MCS, Blunt PCR
Product Line: CloneJET