Shop All Cloning Competent Cells

One Shot™ Mach1™ T1 Phage-Resistant Chemically Competent E. coli (Invitrogen™)

One Shot® Mach1™ T1 Phage-Resistant Chemically Competent E. coli are the fastest growing chemically competent cells currently available (see figure). Doubling time is approximately 50 minutes, compared to >74 minutes for other cloning strains. Mach1™ colonies are clearly visible within eight hours of plating the transformation mix, enabling you to plate and pick colonies the same day. Perform mini-preps after only 4 hours of growth from an overnight colony—saving an entire day in your experiments. The fast-growing Mach1™ T1R strain:

• Minimizes nonspecific recombination in cloned DNA (recA)
• Offers resistance to T1 and T5 phage (tonA)
• Yields cleaner preparations of DNA and better results in downstream applications due to the elimination of nonspecific digestion by Endonuclease I (endA1)
• Provides efficient transformation of unmethylated DNA from PCR amplifications (hsdR)
• Allows blue/white screening of recombinant clones (lacZΔM15)

Two formats to choose from
• The convenient One Shot® format provides single-use, 50-µL aliquots that eliminate efficiency-zapping, freeze-thaw cycles and money wasted on unused cells
• The MultiShot™ StripWell format allows rapid, high-throughput transformation in a 96-well stripwell plate, which allows you to perform as few or as many transformations as you need without wasting reagents

MultiShot™ FlexPlate Mach1™ T1R Competent Cells (Invitrogen™)

MultiShot FlexPlate Mach1 T1R chemically competent E. coli cells are cloning competent cells that are pre-aliquoted in a 96-well PCR plate to increase transformation productivity. The FlexPlate format can be divided down to any combination of 8-well segments for flexibility in transformation throughput. MultiShot FlexPlate Mach1 T1R competent E. coli cells are exceptionally fast-growing chemically competent cells, accelerating the time to clone evaluation.

All of our T1R strains have the tonA (fhuA) deletion in their genotype that confers resistance to T1 and T5 phage. T1 bacteriophage spread rapidly and lyse E. coli hosts, which are commonly used for cloning and library construction. A resistant genotype offers added security to protect valuable clones and libraries. This is especially important for genome and sequencing centers where T1 phage infection would be catastrophic.

Speedy Mach1 T1R cloning capabilities
MultiShot FlexPlate Mach1 T1R competent E. coli cells are fast growing. Mach1 colonies are clearly visible within eight hours of plating the transformation mix, enabling you to plate and pick colonies the same day. Perform mini-preps after only four hours of growth from an overnight colony—saving an entire day in your experiments. The Mach1 T1R strain is useful for many cloning applications and provides transformation efficiencies of >1 x 108 cfu/µg with control plasmid DNA.

Key features of the MultiShot FlexPlate Mach1 T1R Competent Cells include:
endA1 for cleaner preparations of DNA and better results in downstream applications due to the elimination of non-specific digestion by endonuclease I
recA1398 for reduced occurrence of non-specific recombination in cloned DNA
hsdR for efficient transformation of unmethylated DNA from PCR amplifications
tonA (fhuA) for T1 and T5 phage resistance
lacZΔM15 for blue/white color screening of recombinant clones

MultiShot FlexWell format—increase transformation productivity
The FlexPlate is a 96-well PCR plate that can be used in automated liquid handling systems or divided into any combination of 8-well segments for flexibility in transformation throughput. Addition of DNA to the MultiShot FlexPlate Competent Cells can be done quickly with a multichannel pipet or a liquid handling system. After addition of DNA, MultiShot FlexPlate Competent Cells can efficiently be transformed by heat-shock using a water bath, heat block, or thermal cycler.

Key features of the MultiShot FlexPlate format include:
Increase throughput—compatible with automated liquid handling platforms
Flexible—transform in increments of 8 wells to entire 96-well plate
Convenient—competent cells pre-aliquoted into 96-well plate, ready for transformation

Genotype: F- φ80(lacZ)ΔM15 ΔlacX74 hsdR(rK-mK+) ΔrecA1398 endA1 tonA

Find the strain and format that you need
We offer many other E. coli strains and formats of chemically competent cells and electrocompetent cells to help meet your specific transformation needs. If you require other high-throughput transformation options, choose from our collection of MultiShot formatted comp cells or email us for custom formatting options.

MAX Efficiency™ DH5α-T1R Competent Cells (Invitrogen™)

MAX Efficiency DH5α T1 Phage-Resistant Competent Cells are high efficiency chemically competent cells for generating cDNA libraries. In addition to supporting blue/white screening, recA1 and endA1 mutations in DH5α increase insert stability and improve the quality of plasmid DNA prepared from minipreps. MAX Efficiency DH5α T1 Phage-Resistant Competent Cells yield >1 × 109 transformants/µg of monomer pUC19 DNA in a 100-µl transformation reaction.

One Shot™ TOP10/P3 Chemically Competent E. coli (Invitrogen™)

TOP10/P3 E. coliallow high-quality plasmid preparation of pCDM8, pcDNA™1.1, or any other supF-containing vector. The strain features:

• P3 plasmid for selection of supF-containing plasmids
• Mutated endA1 gene for increased quality of plasmid DNA preparations

MultiShot™ StripWell Mach1™ T1 Phage-Resistant Chemically Competent E. coli (Invitrogen™)

MultiShot StripWell Mach1 T1R chemically competent E. coli cells are cloning competent cells that are packaged in a rack containing 12 strips of 8 tubes to increase productivity for medium-throughput bacterial transformations. MultiShot StripWell Mach1 T1R competent E. coli cells are exceptionally fast-growing chemically competent cells, accelerating the time to clone evaluation.

All of our T1R strains have the tonA (fhuA) deletion in their genotype that confers resistance to T1 and T5 phage. T1 bacteriophage spread rapidly and lyse E. coli hosts, which are commonly used for cloning and library construction. A resistant genotype offers added security to protect valuable clones and libraries. This is especially important for genome and sequencing centers where T1 phage infection would be catastrophic.

Speedy Mach1 T1R cloning capabilities
MultiShot FlexPlate Mach1 T1R Competent Cells are fast growing. Mach1 colonies are clearly visible within eight hours of plating the transformation mix, enabling you to plate and pick colonies the same day. Perform mini-preps after only four hours of growth from an overnight colony—saving an entire day in your experiments. The Mach1 T1R strain is useful for many cloning applications and provides transformation efficiencies of >1 x 108 cfu/µg with control plasmid DNA.

Key features of the MultiShot FlexPlate Mach1 T1R Competent Cells include:
endA1 for cleaner preparations of DNA and better results in downstream applications due to the elimination of non-specific digestion by endonuclease I
recA1398 for reduced occurrence of non-specific recombination in cloned DNA
hsdR for efficient transformation of unmethylated DNA from PCR amplifications
tonA (fhuA) for T1 and T5 phage resistance
lacZΔM15 for blue/white color screening of recombinant clones

MultiShot StripWell format—flexible for no waste
Each StripWell of eight connected tubes is designed with the same single-tube, single-use features as our One Shot format tubes. This format allows for all steps of the transformation protocol, up to plating, to take place in the same tube, thereby saving time and preventing contamination. After addition of DNA, MultiShot StripWell competent cells can be transformed by heat-shock at 42°C using a water bath, all in the same tube.

The StripWell tubes can be cut to permit transformations in a single tube, eliminating wasted aliquots of cells and avoiding freeze-thaws that can result in reduced transformation efficiency.

Key features of the MultiShot StripWell format include:
Increased productivity—for medium throughput experimentation
Maximal flexibility—transform as few as 1 tube and as many as 96 from the StripWell rack
Familiar convenience—no aliquotting, add DNA directly to cells, heat shock, and recover in the same tube
Peace of mind—single-use transformation minimizes contamination

Genotype: F- φ80(lacZ)ΔM15 ΔlacX74 hsdR(rK-mK+) ΔrecA1398 endA1 tonA

Find the strain and format that you need
We offer many other E. coli strains and formats of chemically competent cells and electrocompetent cells to help meet your specific transformation needs. If you require other high-throughput transformation options, choose from our collection of MultiShot formatted comp cells or email us for custom formatting options.

MAX Efficiency™ DH5αF´IQ Competent Cells (Invitrogen™)

MAX Efficiency DH5αF´IQ Chemically Competent Cells are high-efficiency chemically competent cells available for M13 cloning, cloning into plasmids with an f1-like origin of replication (phagemids), or cloning into any vector that uses expression from the lac promoter.
MAX Efficiency DH5αF´IQ cells offer the following features:

• >3 x 108 transformants/µg efficiency
• Stable F´ episome eliminates need for growth on minimal media
• ZΔM15 for blue/white screening of colonies or plaques

Three milliliters of lawn cells and a vial of monomer M13mp18 RF DNA are supplied as a control.

One Shot™ OmniMAX™ 2 T1R Chemically Competent E. coli (Invitrogen™)

The One Shot® OmniMAX™ 2 T1R E. coli strain is an improved chemically competent cell line, perfect for use in all cloning applications, including the Gateway® technology. OmniMAX™ 2 T1R cells offer the highest transformation efficiency of any chemically competent cells in a One Shot® format, with >5 x 109 transformants/µg pUC19. They also provide efficient transformation of highly methylated DNA, since OmniMAX™ 2 T1R cells lack the E. coli K12 restriction systems (mcrA Δ(mrr hsdRMS-mcrBC)). In addition, the strain carries the tonA genotype, which confers resistance to T1 and T5 phage infection. This protects your samples and minimizes the possibility of downtime in your lab due to phage contamination. The highly versatile OmniMAX™ 2 T1R strain offers the following benefits:

• Ideal for transformation of Gateway® and TOPO® reactions
• Resistance to T1 and T5 phage (tonA)
• Construction of more representative genomic libraries due to the elimination of mcrA, mcrBC, mrr, and hsdRMS
• Blue/white screening of recombinant clones (lacZΔM15)

Genotype: F´ {proAB lacIq lacZΔM15 Tn10(TetR ) Δ(ccdAB)} mcrA Δ(mrr hsdRMS-mcrBC) Φ 80(lacZ)ΔM15 Δ(lacZYA-argF)U169 endA1 recA1 supE44 thi-1 gyrA96 relA1 tonA panD

Library Efficiency™ DH5α Competent Cells (Invitrogen™)

Library Efficiency DH5α Competent Cells are a versatile strain of chemically competent cells that demonstrate transformation efficiencies of >1 x 108 cfu/µg plasmid DNA. Library Efficiency DH5α Competent Cells are ideal for difficult cloning constructions or any application that uses limiting amounts of DNA. Features of these cells:

• Supports blue/white screening by α-complementation on plates containing X-Gal or Bluo-Gal
• Maintains plasmid DNA with minimum recombination events
• Delivers high-yield plasmid preparations for downstream applications
• M13mp cloning vectors may be propagated on a lawn of DH5α-FT, DH5αF', DH5αF'IQ, JM101, or JM107 for plaque formation

Ideal for difficult cloning projects
Library Efficiency DH5α Competent Cells are recommended for routine cloning of genes into large plasmids, and are suitable for difficult clone constructions, such as blunt-end ligations. Library Efficiency DH5α Competent Cells have a mid-range transformation efficiency (>1 x 108 cfu/µg control DNA per 100 µL reaction). The strain also has the Φ80lacZΔM15 genotype, allowing blue/white screening on plates containing either X-Gal or Bluo-Gal. Finally, the recA1 mutation helps reduce the rate of recombination while propagating plasmid DNA, and the endA1 mutation makes DH5α cells an excellent choice for amplifying plasmid DNA for subsequent extraction and purification.

Genotype: F- Φ80lacZΔM15 Δ(lacZYA-argF) U169 recA1 endA1 hsdR17(rk-, mk+) phoA supE44 thi-1 gyrA96 relA1 λ-

MAX Efficiency™ Stbl2™ Competent Cells (Invitrogen™)

MAX Efficiency® Stbl2™ Competent Cells are high-efficiency chemically competent cells specifically designed for cloning unstable inserts. In addition to recA1, a unique set of genetic markers allow for stable cloning of direct repeat and retroviral sequences and tandem array genes. MAX Efficiency® Stbl2™ Competent Cells offer:

• >1 x 109 transformants/µg plasmid DNA for cloning rare sequences
• Elimination of mcrBC-hsdRMS-mrr and mutation of mcrA—allows cloning of methylated genomic sequences
• A unique genotype that stabilizes direct repeat and retroviral sequences such as SIV and HIV
• Greatly increased plasmid yield and quality due to endA1 mutation

MAX Efficiency™ DH10Bac Competent Cells (Gibco™)

MAX Efficiency DH10Bac Competent Cells are used for production of recombinant bacmids used in the Bac-to-Bac Baculovirus Expression System. The DH10Bac E. coli strain contains a baculovirus shuttle vector (bacmid) that can recombine with a donor plasmid, pFastBac, to create an expression bacmid containing a cloned gene of interest. Features of MAX Efficiency DH10Bac Competent Cells include:

• Consistent yields of >1 × 108 transformants/µg
• Tolerance of small amounts of undiluted ligation reactions
• Support of efficient blue/white colony screening (Φ80lacZΔM15 marker)

Using MAX Efficiency DH10Bac competent cells
MAX Efficiency DH10Bac Competent Cells can serve as a host for a recombinant pFastBac vector containing a cloned gene of interest. DH10Bac cells harbor a baculovirus shuttle vector (bMON14272) and a helper plasmid (pMON7142), and are capable of supporting site-specific recombination between pFastBac and bMON14272 to generate high molecular weight bacmids that can then be amplified, purified, and used for insect cell transfection and subsequent gene expression. Kanamycin resistance for bacmid selection and maintenance is conferred by bMON14272, and tetracycline resistance by pMON7124.

Genotype:F-mcrA Δ(mrr-hsdRMS-mcrBC) Φ80lacZΔM15 ΔlacX74 recA1 endA1 araD139 Δ(ara, leu)7697 galU galK λ-rpsL nupG/pMON14272/pMON7124

MultiShot™ TOP10 Chemically Competent E. coli (Invitrogen™)

MultiShot™ TOP10 Chemically Competent E. coli provide transformation efficiencies of >1 x 108 cfu/µg control plasmid DNA, and are suited for high-throughput transformations. MultiShot™ TOP10 Chemically Competent cells are packaged in five 96-well microtiter plates (15 µL aliquots) to simplify high-throughput bacterial transformations. Benefits of MultiShot™ TOP10 cells:

• Designed for high-throughput applications—microtiter plate format designed for automated high-throughput cloning
• Compatible with genomic DNA—the mcrA mutation supports efficient transfection of methylated DNA
• Permits rapid screening—the LacZΔM15 allele permits rapid blue/white screening of transfectants on plates containing X-Gal or Bluo-Gal
• Efficient—the endA1 mutation helps reduce endonuclease activity, improving subsequent plasmid DNA yields
• Reliable—the recA1 mutation helps reduce unwanted recombinationEasy to use for high-throughput transformations
MultiShot™ TOP10 Chemically Competent cells are genetically similar to the reliable DH10B™ strain, and are available in five 96-well plates to facilitate high-throughput transformation. After addition of DNA, MultiShot™ TOP10 Chemically Competent cells can be transformed by heat-shock at 42°C using a heat block or thermocycler. Using our TA Cloning® and TOPO® Cloning protocols, including controls, yields of 100–400 colonies per agar plate can be expected.

Genotype: F-mcrA Δ(mrr-hsdRMS-mcrBC) Φ80lacZΔM15 ΔlacX74 recA1 araD139 Δ(ara, leu)7697 galU galK rpsL (StrR) endA1 nupG

Find the strain and format that you need
We also offer many other different strains and formats of chemically competent cells and electrocompetent cells to help meet your specific transformation needs. If you require other high-throughput transformation options, choose from our collection of MultiShot™ formatted comp cells or contact us for custom formatting options.

MultiShot™ FlexPlate Stbl3™ Competent Cells (Invitrogen™)

MultiShot FlexPlate Stbl3 chemically competent E. coli cells are cloning competent cells that are packaged in a rack containing 12 strips of 8 wells to increase productivity for medium-throughput bacterial transformations. MultiShot FlexPlate Stbl3 competent E. coli cells are designed especially for cloning direct repeats found in lentiviral expression vectors. Unlike TOP10 E. coli, these cells reduce the frequency of homologous recombination of long terminal repeats (LTRs) found in ViraPower Lentiviral Expression vectors and other retroviral vectors. The DNA yield from Stbl3 cells is often >10-fold higher than alternative strains such as TOP10 (see table).

Reduce unwanted recombination with Stbl3 cells
MultiShot FlexPlate Stbl3 Competent Cells are derived from the HB101 E. coli strain and are recommended for use when cloning unstable inserts such as lentiviral DNA containing direct repeats (e.g., ViraPower Lentiviral Expression kits). The transformation efficiency of these cells is greater than 1 × 107 cfu/µg plasmid DNA.

Key features of the MultiShot FlexPlate Stbl3 Competent Cells include:
Optimal performance for the propagation of lentiviral vectors
mcrB, mrr for enhanced genomic cloning capacity
recA13 for reduced occurrence of non-specific recombination in cloned DNA
High DNA yields

MultiShot FlexWell format—increase transformation productivity
The FlexPlate is a 96-well PCR plate that can be used in automated liquid handling systems or divided into any combination of 8-well segments for flexibility in transformation throughput. Addition of DNA to MultiShot FlexPlate Competent Cells can be done quickly with a multichannel pipet or a liquid handling system. After addition of DNA, the cells can be transformed efficiently by heat-shock using a water bath, heat block, or thermal cycler.

Key features of the MultiShot FlexPlate format include:
Increase throughput—compatible with automated liquid handling platforms
Flexible—transform in increments of 8 wells to entire 96-well plate
Convenient—competent cells pre-aliquoted into 96-well plate, ready for transformation

Genotype: F-mcrB mrr hsdS20(rB-, mB-) recA13 supE44 ara-14 galK2 lacY1 proA2 rpsL20(StrR) xyl-5 λ- leu mtl-1

Find the strain and format that you need
We offer many other E. coli strains and formats of chemically competent cells and electrocompetent cells to help meet your specific transformation needs. If you require other high-throughput transformation options, choose from our collection of MultiShot formatted comp cells or email us for custom formatting options.

One Shot™ ccdB Survival™ 2 T1R Competent Cells (Invitrogen™)

One Shot® ccdB Survival™ 2 T1R Chemically Competent Cells are suitable for the propagation of plasmids containing the ccdB gene, and are designed for use with the Gateway® Vector Conversion System and for propagating Gateway® destination, donor, and supercoiled entry vectors. Transformation efficiency is >1 × 109 transformants/µg plasmid DNA. The ccdB Survival™ 2 T1R E. coli strain is derived from the TOP10 strain. The ccdB Survival™ 2 T1R E. coli strain offers the following features:

• Resistance to the ccdB gene product
• Resistance to T1 and T5 phage (the tonA/fhuA phenotype)
• Supports high-yield preparation of supercoiled plasmid DNA (the endA1 phenotype)
• Reduced nonspecific recombination of cloned DNA (the recA1 phenotype)

Genotype: F-mcrA Δ(mrr-hsdRMS-mcrBC) Φ80lacZΔM15 ΔlacX74 recA1 araΔ139 Δ(ara-leu)7697 galU galK rpsL (StrR) endA1 nupG fhuA::IS2

DH5α Competent Cells (Thermo Scientific™)

Thermo Scientific DH5α Competent Cells are high efficiency, chemically competent E. coli cells ideal for construction of gene banks or generation of cDNA libraries using plasmid-derived vectors. The φ80dlacZΔM15 marker provides α-complementation of the β-galactosidase gene from pUC or similar vectors to allow blue/white colony screening on bacterial agar plates containing Bluo-Gal or X-Gal. RecA1 and endA1 mutations in DH5α cells improve insert stability and quality of the extracted plasmid DNA.

• High transformation efficiency: >1x109 cfu/µg pUC19 DNA
• Suitable for routine and high-throughput cloning applications
• Genetic markers that allow for blue/white colony screening
• Convenient two reactions per vial packaging
• S.O.C. Outgrowth medium included

Applications
DH5α Competent Cells are suitable for variety of applications requiring high transformation efficiency:
• Efficient DNA cloning derived from PCR, cDNA-generation reactions
• recA1 marker facilitates working with difficult to transform DNA
• Ideal for generation of cDNA libraries using plasmid-derived vectors
• Site-directed mutagenesis

Genotype
F– φ80lacZΔ M15 Δ (lacZYA-argF) U169 recA1 endA1 hsdR17 (rK– mK+) phoA supE44 λ- thi–1 gyrA96 relA1

MultiShot™ FlexPlate OmniMAX™ 2 T1R Competent Cells (Invitrogen™)

MultiShot FlexPlate OmniMAX 2 T1R chemically competent E. coli cells are a superior strain of cloning competent cells that are pre-aliquoted in a 96-well PCR plate to increase transformation productivity. The FlexPlate format can be divided down to any combination of 8-well segments for flexibility in transformation throughput.

All of our T1R strains have the tonA (fhuA) deletion in their genotype that confers resistance to T1 and T5 phage. T1 bacteriophage spread rapidly and lyse E. coli hosts, which are commonly used for cloning and library construction. A resistant genotype offers added security to protect valuable clones and libraries. This is especially important for genome and sequencing centers where T1 phage infection would be catastrophic.

Abundance of colonies with OmniMAX 2 T1R cloning capabilities
MultiShot FlexPlate OmniMAX 2 T1R cells are an improved chemically competent E. coli cell line, perfect for use in all cloning applications, including Gateway cloning, and provide transformation efficiencies in the MultiShot FlexPlate format of >5 x 108 cfu/µg with control plasmid DNA. These cells also provide efficient transformation of highly methylated DNA, since OmniMAX 2 T1R cells lack the E. coli K-12 restriction systems (mcrA Δ(mrr hsdRMS-mcrBC)).

Key features of the MultiShot FlexPlate OmniMAX 2 T1R Competent Cells include:
Δ(ccdAB) for sensitivity to the toxic effects of the ccdB gene product, allowing negative selection of vectors containing the ccdB gene—ideal for transformation of Gateway and TOPO reactions
mcrA, mcrBC, mrr, and hsdRMS elimination of restriction systems to allow construction of more representative genomic constructs
tonA (fhuA) genotype to confer resistance to T1 and T5 phage
Highest transformation efficiency in FlexWell format (>5x108 cfu/µg control DNA)
endA1 for increased plasmid yield and quantity
recA1 for reduced occurrence of non-specific recombination in cloned DNA
lacZΔM15 for blue/white color screening of recombinant clones

MultiShot FlexWell format—increase transformation productivity
The FlexPlate is a 96-well PCR plate that can be used in automated liquid handling systems or divided into any combination of 8-well segments for flexibility in transformation throughput. Addition of DNA to the MultiShot FlexPlate Competent Cells can be done quickly with a multichannel pipet or a liquid handling system. After addition of DNA, the cells can be transformed efficiently by heat-shock using a water bath, heat block, or thermal cycler.

Key features of the MultiShot FlexPlate format include:
Increase throughput—compatible with automated liquid handling platforms
Flexible—transform in increments of 8 wells to entire 96-well plate
Convenient—competent cells pre-aliquoted into 96-well plate, ready for transformation

Genotype: F´ {proAB lacIq lacZΔM15 Tn10(TetR ) Δ(ccdAB)} mcrA Δ(mrr hsdRMS-mcrBC) Φ 80(lacZ)ΔM15 Δ(lacZYA-argF)U169 endA1 recA1 supE44 thi-1 gyrA96 relA1 tonA panD

Find the strain and format that you need
We offer many other E. coli strains and formats of chemically competent cells and electrocompetent cells to help meet your specific transformation needs. If you require other high-throughput transformation options, choose from our collection of MultiShot formatted comp cells or email us for custom formatting options.