Intact Genomics (ig®) HB101 chemically competent E. coli cells are suitable for high-efficiency transformation in a wide variety of applications such as cloning and sub-cloning. E. coli HB101 is a K12 x B hybrid strain, containing the recA13 mutation that minimizes recombination and helps insert stability. In addition, it carries the hsdS20(rB-mB-) restriction minus genotype which prevents cleavage of cloned DNA by endogenous restriction enzymes. HB101 strain does not support Alpha-complementation for blue/white screening.


Competent cell type:            Chemically competent
Derivative of:                        HB101
Species:                                E. coli
Format:                                 Tubes
Transformation efficiency:      ≥1 x 108 cfu/µg pUC19 DNA
Blue/white screening:           No
Shipping condition:               Dry ice

Reagents Needed for One Reaction

ig® HB101 chemically competent cells:   50 µl
DNA (or pUC19 Control, 10 pg/µl):            1 µl
Recovery medium:                                    1 ml


ig® HB101 competent cells:    -80 ºC
pUC19 control DNA:                 -20 ºC
Recovery medium:                       4 ºC


F- Lambda- araC14 leuB6(Am) DE(gpt-proA)62 lacY1 glnX44(AS) galK2(Oc) recA13 rpsL20(strR) xylA5 mtl-1 thiE1 hsdS20(rB-, mB-)

Quality Control

Transformation efficiency is tested by using the pUC19 control DNA supplied with the kit and using the high-efficiency transformation protocol. Transformation efficiency should be greater than 1×108 CFU/µg pUC19 DNA. Untransformed cells are tested for appropriate antibiotic sensitivity.

General Guidelines

Follow these guidelines when using ig® HB101 chemically competent cells.

  • Handle competent cells gently as they are highly sensitive to changes in temperature or mechanical lysis caused by pipetting.
  • Thaw competent cells on ice, and transform cells immediately following thawing. After adding DNA, mix by tapping the tube gently. Do not mix cells by pipetting or vortexing.

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