Methionine-Auxotrophic EHA105Met Electrocompetent Agrobacterium reduce bacterial overgrowth during co-cultivation
Methionine Auxotrophic EHA105Met Electrocompetent Agrobacterium cells
$495.00 – $1,195.00
Intact Genomics (ig®) Methionine-Auxotrophic EHA105Met ElectroCompetent Agrobacterium cells include modifications so that they will not grow unless free methionine is added to Minimal medium. This prevents the bacteria from overgrowing plant tissues when used for plant transformation. Methionine- Auxotrophic EHA105Met ElectroCompetent Agrobacterium cells are optimized for the highest transformation efficiencies. The EHA105Met strain is useful for transgenic operations of rice, tobacco and other plants. EHA105 contains a rifampicin resistance gene (rif). EHA105Met strain also contains an amber basic Ti plasmid pEHA105 (pTiBo542DT-DNA) without self-transport function, which contains the vir gene.
Custom Aliquots Available
- Methionine Auxotrophic
- Enables development of more efficient transformation systems
- Reduced bacterial overgrowth during co-cultivation
- Decreased need for antibiotics
Competent cell type: Electrocompetent
Species: A. tumefaciens
Transformation efficiency: ≥ 1 x 107 cfu/µg pUC19 DNA
Shipping condition: Dry ice
- ig® Methionine-Auxotrophic EHA105Met Electrocompetent Agrobacterium Cells
- DNA (pCAMBIA1391z, 500 pg/µl)
- Recovery medium
- ig® Methionine Auxotrophic EHA105Met Electrocompetent Agrobacterium Cells: -80 ºC
- pCAMBIA1391z control DNA: -20 ºC
- Recovery medium: 4 ºC
Transformation efficiency is tested by using the pCAMBIA1391z control DNA supplied with the kit and using the protocol given below. Transformation efficiency should be ≥1 x 107 CFU/µg pCAMBIA1391z DNA. Untransformed cells are tested for appropriate antibiotic sensitivity.
Follow these guidelines when using ig® Methionine-Auxotrophic EHA105Met Electrocompetent Agrobacterium :
- 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.
Example 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 = 500
µg of DNA = 0.0005
Dilution = 100/1000=0.1
TE = 500/.0005/.1 = 1.0×1071278-15 1278-30
5×50μl, 15×50μl, 6×100μl, 12×100μl
Prías-Blanco, M., Chappell, T.M., Freed, E.F. et al. An Agrobacterium strain auxotrophic for methionine is useful for switchgrass transformation. Transgenic Res 31, 661–676 (2022). https://doi.org/10.1007/s11248-022-00328-4
Intact Genomics (IG®) is dedicated to customer satisfaction regarding the use of our products for your research needs. We test our products thoroughly to ensure they conform to the highest quality standards and provide excellent results when following the protocol’s specifications. Please follow the protocol information provided in this manual carefully and contact our customer and technical support team with any questions or comments you may have regarding this or our other products.
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Phone: (314) 942-3655 | Toll free: 855-835-7172
The auxotrophic Agrobacterium tumefaciens strains were developed with funding from the U.S. Department of Energy’s Center for Bioenergy Innovation (CBI).
Intact Genomics owns the following registered trademarks granted by the United States Patent and Trademark Office (USPTO): Intact Genomics®, IG®, ig®, igTherapeutics®, FastAmp®, i7®, DirectPlate® .
All technology protocols discussed within this manual are assumed proprietary to IG’s products, and if registered, are protected by US patent and trademark laws.
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Buyer agrees by purchasing the product that it’s intended use is for research purposes only, not for human or diagnostic use. Purchase of this material conveys to buyer the non-transferable right to use the material purchased in research conducted by buyer, whether for teaching, non-commercial or commercial research purposes. Buyer may not sell or otherwise transfer these materials, its components, or unmodified descendants to a third party. Use of these products maybe covered by IG’s patents or trademarks.
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Use this procedure to transform (ig®) Methionine-Auxotrophic EHA105Met Electrocompetent Agrobacterium cells. Do not use these cells for chemical transformation.
1) Place sterile cuvettes and microcentrifuge tubes on ice.
2) Remove competent cells from the -80 °C freezer and thaw completely on wet ice (10-15 minutes).
3) Aliquot 1 µl (10pg -1 µg) of DNA to the chilled microcentrifuge tubes on ice.
4) When the cells are thawed, add 25 μl of cells to each DNA tube on ice and mix gently by tapping 4-5 times.
For the pCAMBIA1391z control, add 1 µl of (500 pg/µl) DNA to the 25 µl of cells on ice. Mix well by tapping.
Do not pipette up and down or vortex to mix, this can harm cells and decrease transformation efficiency.
5) Pipette 26 µl of the cell/DNA mixture into a chilled electroporation cuvette without introducing bubbles. Quickly flick the cuvette downward with your wrist to deposit the cells across the bottom of the well and
6) Immediately add 974 µl of Recovery Medium or any other medium of choice to the cuvette, pipette up and down three times to re-suspend the cells. Transfer the cells and Recovery Medium to an Eppendorf tube.
7) Incubate tubes at 30 °C for 3 hours at 200 RPM.
8) Dilute the cells as appropriate then spread 20-200 μl
cells onto a pre-warmed selective plate. For the pCAMBIA1391z control, you may plate 100 μl of undiluted transformation mix onto a YT plate containing 15 μg/ml rifampicin and 50 μg/ml kanamycin. Use sterilized spreader or autoclaved ColiRoller™ plating beads to spread evenly.
9) Incubate the plates for 2 – 3 days at 30 °C.