Description
GoldBio’s DH10B-Pro™ Electrocompetent E. coli
cells are especially designed for the most demanding cloning
applications. DH10-Pro™ cells will provide the greatest number of
transformants for when your research requires it, including assembling
large and multi-DNA fragments, cloning large (≥10 kb up to 350 kb) or
difficult construct transformations, working with synthetic
bio-applications, and even BAC cloning.
Product Specifications
Competent cell type: ElectroCompetent
Derivative of: DH10B™
Species: E. coli
Transformation efficiency: ≥1 x 109 cfu/µg pUC19 DNA
Blue/white screening: Yes
Storage/Handling: This product may be shipped on dry ice. DH10B-Pro™ Electrocompetent 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.
Genomic Features
- ≥1 x 109 cfu/µg efficiency with electroporation
Genotype
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
- DH10B-Pro™ electrocompetent cells: 25 µl
- DNA (or pUC19 Control, 10 pg/µl): 1 µl
- Recovery medium: 1 ml
Quality Control
Transformation efficiency is tested by using pUC19, ~50kb, and >100kb plasmids. The pUC19 control DNA is supplied with the kit and can be used with the protocol given below. Transformation efficiency should be ≥1 x 109 CFU/µg pUC19 DNA. Untransformed cells are tested for appropriate antibiotic sensitivity.
General Guidelines
- 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.
Note: A high-voltage electroporation apparatus capable of generating field strengths of 16 kV/cm is required.
Calculation of Transformation Efficiency
Transformation Efficiency (TE) is defined as the number of colony forming units (cfu) produced by transforming 1 µg 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
