One Shot™ INVαF' Chemically Competent E. coli

One Shot INVαF´ Chemically Competent E. coli are designed to stably replicate high-copy number plasmids. They allow for the preparation of high quality plasmid DNA with less carry over contaminants as compared to other popular strains such as JM109 and can achieve a transformation efficiency of >1 x 10⁸ cfu/μg supercoiled plasmid.

INVαF´ cells carry the F´ episome and so can be utilized to produce single-stranded DNA (ssDNA) from vectors that have an f1 origin of replication. This strain is related to DH strains and features similar genetic traits and benefits. The lacZΔM15 marker provides α-complementation of the ß-galactosidase gene from pUC or similar vectors and can be used for blue-white screening of colonies on bacterial plates containing Bluo-Gal or X-Gal. In addition to supporting blue/white screening, recA1 and endA1 mutations increase insert stability and improve the quality of plasmid DNA.

One Shot INVαF´ Chemically Competent E. coli cells offer:
• Transformation efficiencies of >1 x 10⁸ cfu/μg
• Stability and exceptional quality of high-copy number plasmid DNAb
• Blue-white screening of recombinant clones (lacZΔM15)
• Reduction of homologous recombination of transformed plasmids (recA1)
• Increased quality of plasmid DNA preparations (endA1)
• Production and rescue of ssDNA from vectors carrying the f1 origin of replication (F´)

Note: INVαF´ cells do not require IPTG to induce expression from the lac promoter.

Convenient and efficient format
One Shot INVαF´ Chemically Competent E. coli cells are supplied in the convenient, single-reaction One Shot format. Each tube contains enough cells for one complete transformation, reducing freeze-thaw cycles and limiting money wasted on unused cells.

Genotype
F´ endA1 recA1 hsdR17 (r_K^–, m_K⁺) supE44 thi-1 gyrA96 relA1 φ80lacZΔM15 Δ(lacZYA-argF)U169 λ^–
Genetic marker descriptions

Find the strain and format that fit your needs
A variety of DH strains are available in chemically competent and electrocompetent cell formats.
We offer other strains for ssDNA production, such as TOP10F´ or electrocompetent DH12S.
MultiShot formats are available for high throughput applications.
Explore bacterial growth media formats.