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SIG10 Chemically Competent Cells

for protein expression and DNA plasmid production



for molecular biology


buffered aqueous solution

cell transformation

competent cell type: chemically competent
transformation efficiency: ≥1 × 109 cfu/μg

shipped in

dry ice

storage temp.


General description

The SIG10 Chemically Competent Cells are a derivative of Escherichia coli that have been optimized for high transformation efficiency.
These cells are ideal for cloning and propagation of plasmid, cosmid, or fosmid clones and are highly efficient for routine cloning applications.
They share the most useful genetic elements of standard cloning strains like DH5α DH10B, JM109, TOP10, etc. and directly replace them in cloning protocols.
They are are provided in 40 μL, 80 μL and 160 μL aliquots, each being sufficient for one, two and four transformations respectively.
The cells have a transformation efficiency of >1 x 109 cfu/μg
The 96-well format are provided in aliquots of 20 μL per well and have a transformation efficiency of >1 x 108 cfu/μg.

F- mcrA Δ(mrr-hsdRMS-mcrBC) endA1 recA1 Φ80dlacZΔM15 ΔlacX74 araD139 Δ(ara,leu)7697 galU galK rpsL nupG λ- tonA


Suitable for bacterial transformations to recover high quality plasmid DNA

Features and Benefits

  • share the most useful genetic elements of standard cloning strains like DH5α DH10B, JM109, TOP10, etc. and directly replace them in cloning protocols.
  • ensures recovery of stable and high quality plasmid DNA.
  • high transformation efficiency
  • provide the performance researchers need with ease of use.
  • provide solutions for a wide range of applications at economical prices.
  • Blue - white screening


  • SIG10 chemically competent cells
  • pUC 19 transformation control DNA at 10 pg/μL
  • recovery medium for cloning


The SIG10 cells contains the inactive mcr and mrr alleles, allowing methylated genomic DNA isolated directly from mammalian or plant cells to be cloned without deletions or rearrangements.
This strain also carries the recA1 and endA1 mutations. The recA1 genotype provides minimized recombination and aids in plasmid stability while endA1 provides for high quality plasmid DNA preparation.
They are bacteriophage T1-resistant (tonA mutation) and also resistant to streptomycin by virtue of rpsL mutation.

Legal Information

DH10B is a trademark of Life Technologies
DH5α is a trademark of Invitrogen Corp.

Storage Class Code

10 - Combustible liquids



Certificate of Analysis

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Certificate of Origin

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SIG10 Chemically Competent Cells

For best results, ligation reactions must be heat inactivated at 70ºC for 15 minutes before transformation. Alternately, the reactions may be purified.

Colony PCR

Colony PCR reagents and our colony PCR protocol using REDExtract-N-Amp™ PCR ReadyMix™ and JumpStart™ REDTaq® PCR ReadyMix™ reagents.

Bacterial Transformation

Bacterial transformation is a process of horizontal gene transfer by which some bacteria take up foreign genetic material (naked DNA) from the environment. Bacteria that can take up free, extracellular genetic material are known as competent cells.

Our team of scientists has experience in all areas of research including Life Science, Material Science, Chemical Synthesis, Chromatography, Analytical and many others.

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