Intact Genomics SS320 (MC1061F\’) phage display electrocompetent cells are suitable for protein expression, general cloning, blue/white screening, M13 phage work and phage display protein expression.
Competent cell type: ElectroCompetent
Species: E. coli
Transformation efficiency: ≥ 5 x 1010 cfu/µg pUC19 DNA
Blue/white screening: Yes
Shipping condition: Dry ice
Reagents Needed for One Reaction
SS320 phage display electrocompetent cells: 25 µl
DNA (or pUC19 Control, 10 pg/µl): 1 µl
Recovery medium: 1 ml
SS320 phage display electrocompetent cells: -80 ºC
pUC19 control DNA: -20 ºC
Recovery medium: 4ºC
Intact Genomics SS320 phage display electrocompetent cells have the following features:
- >5 x 1010cfu/µg efficiency with electroporation.
- Non-amber suppressor strain (sometimes called MC1061F\’)
F'[proAB+ lacIq lacZΔM15 Tn10 (tetr)] hsdR mcrA0 araD139 Δ(araA-leu)7697 ΔlacX74 spoT1 galK λe14- galE rpsL thi
Transformation efficiency is tested by using the pUC19 control DNA supplied with the kit and using the protocol given below. Transformation efficiency should be >5 x 1010 CFU/µg pUC19 DNA. Untransformed cells are tested for appropriate antibiotic sensitivity.
Follow these guidelines when using Intact Genomics SS320 phage display electrocompetent 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.
Note: A high-voltage electroporation apparatus such as Bio-Rad Gene Pulser II #165-2105, 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 1µg of plasmid into a given volume of competent cells.
TE = Colonies/µg/Dilution
Transform 1 µl of (10 pg/µl) pUC19 control plasmid into 50 µl of cells, add 950 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 100 colonies, the TE is calculated as follows:
Colonies = 100
µg of DNA = 0.00001
Dilution = 50/1000 x 10/1000 = 0.0005
TE = 100/.00001/.0005 = 2.0×10101272-12 1272-24 1274-24 1274-48