DH10B Chemically Competent E. coli Cells
GoldBio’s DH10B Chemically Competent E. coli cells are high efficiency cells, suitable for a wide variety of applications such as cloning and sub-cloning. DH10B Chemically Competent E. coli cells have multiple features including the ɸ80lacZ∆M15 marker, which provides α-complementation of the β-galactosidase gene with blue/white screening protocol. These cells also have the mcrA genotypic marker and the mcrBC, mrr deletion, which allows for cloning of DNA that contains methylcytosine and methyladenine.
Competent cell type: Chemically competent
Derivative of: DH10B™
Species: E. coli
Transformation efficiency: ≥8.2 x 106 cfu/µg pUC19 DNA
Blue/white screening: Yes
Storage/Handling: This product may be shipped on dry ice. DH10B Chemically Competent E. coli cells should be stored at -80°C, pUC19 Control DNA should be stored at -20°C and recovery medium should be stored at 4°C immediately upon arrival. When stored under the recommended conditions and handled correctly, these products should be stable for at least 1 year from the date of receipt.
- Φ80lacZΔM15 marker provides α-complementation of the β-galactosidase gene with blue/white screening
- mcrA genotypic marker and the mcrBC, mrr deletion allows for cloning DNA that contains methylcytosine and methyladenine
F – mcrA ∆(mrr-hsdRMS-mcrBC) endA1 recA1 φ80dlacZ∆M15 ∆lacX74 araD139 ∆(ara, leu)7697 galU galK rpsL (StrR) nupG λ-
Reagents Needed for One Reaction
- 10B chemically competent cells: 50 µl
- DNA (or pUC19 Control, 10 pg/µl): 1 µl
- Recovery medium: 1 ml
Transformation efficiency is tested by using the pUC19 control DNA supplied with the kit and using the protocol given below. Transformation efficiency should be ≥8.2 x 106 CFU/µg pUC19 DNA. Untransformed cells are tested for appropriate antibiotic sensitivity.
- 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.
Calculation of Transformation Efficiency
Transformation Efficiency (TE) is defined as the number of colony forming units (cfu) produced by transforming 1µg of plasmid into a given volume of competent cells.
- TE = Colonies/µg/Dilution
- Colonies = the number of colonies counted
- µg = amount of DNA transformed in µg
- Dilution = total dilution of the DNA before plating
Example: Transform 1 µl of (10 pg/µl) control plasmid into 25 µl of cells, add 975 µl of Recovery Medium. Dilute 10 µl of this in 990 µl of Recovery Medium and plate 50 µl. Count the colonies on the plate the next day. If you count 250 colonies, the TE is calculated as follows:
Colonies = 250
µg of DNA = 0.00001
Dilution = 10/1000 x 50/1000 = 0.0005
TE = 250/0.00001/0.0005 = 5.0 × 1010
Procedure for transformation through heat shock utilizing DH10B Chemically Competent E. coli Cells.
Guide to GoldBio's competent cell collection containing transformation efficiencies, characteristics and applications for each of our competent cell lines.
Chart containing genotypes and transformation efficiencies for GoldBio's competent cell collection.
This guide provides nomenclature information relating to genotypes and genetic markers of E. coli and competent cells.