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Thymidine Auxotrophic EHA105Thy Agrobacterium Chemically Competent Cells


ig® Thymidine-Auxotrophic EHA105 Agro cells includes modifications so that they will not grow unless thymidine is added to Minimal medium.  This prevents the bacteria from overgrowing plant tissues.

    5x50μl - $465.00 (Cat.# 1304-05 )

    15x50μl - $1065.00 (Cat.# 1304-15 )


Intact Genomics (ig®) Thymidine-Auxotrophic EHA105Thy Agrobacterium Chemically Competent Cells include modifications so that they will not grow unless  50 mg/L of thymidine is added to Minimal medium.  This prevents the bacteria from overgrowing plant tissues when used for plant transformation.  Thymidine-Auxotrophic EHA105Thy Agrobacterium Chemically Competent Cells  are optimized for the highest transformation efficiencies. The EHA105Thy strain is useful for transgenic operations of rice, tobacco and other plants. EAH105Thy– thyA knockout mutant derived from EHA105, itself a derivative of A281 (A136/pTiBo542).

Custom Aliquots Available


  • Thymidine Auxotrophic
  • Enables development of more efficient transformation systems
  • Reduced bacterial overgrowth during co-cultivation
  • Decreased need for antibiotics


Competent cell type:  Chemically competent
Species:  A. tumefaciens
Strain:   EHA105Thy
Format:  Tubes
Transformation efficiency: ≥ 1 x 103 cfu/µg  pCAMBIA1391z  DNA
Shipping condition:  Dry ice

Product Components:

  • ig® Thymidine-Auxotrophic EHA105Thy Agrobacterium Chemically Competent Cells
  • DNA (pCAMBIA1391z, 500 pg/µl)
  • Recovery medium*
    * Client needs to add 50 mg/L of thymidine (not provided)  to recovery media before use


  • ig® EHA105Thy Agrobacterium Chemically Competent Cells: -80 °C
  • pCAMBIA1391z control DNA: -20 °C
  • Recovery medium: 4 °C

Quality Control:

Transformation efficiency is tested by using the pCAMBIA1391z control DNA supplied with the kit and using the protocol in this manual. Transformation efficiency should be ≥1 x 103 CFU/µg pCAMBIA1391z DNA. Untransformed cells are tested for appropriate antibiotic sensitivity.

General Guidelines:
Follow these guidelines when using ig® Thymidine-Auxotrophic EHA105Thy Agrobacterium 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.

 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/Plated

Transform 1 µl of (500 pg/µl) pCAMBIA1391z control plasmid into 25 µl of cells, add 974 µl of Recovery Medium. Recover for 3 hours and plate 100 µl. Count the colonies on the plate in two days. If you count 50 colonies, the TE is calculated as follows:

Colonies = 50
µg of DNA = 0.0005
Dilution = 100/1000 = 0.1
TE = 50/.0005/.1 = 1×106

1304 1304-05 1304-15

Additional information


5×50μl, 15×50μl, 6×100μl, 12×100μl


Aliu E., Azanu MK., Wang K., Lee K. Generation of thymidine auxotrophic Agrobacterium tumefaciens strains for plant transformation

Additional Information:
The auxotrophic Agrobacterium tumefaciens strains were developed with support by National Science Foundation Plant Genome Research Program Grant 1725122 and 1917138 to K.W., by the Iowa State University Interdepartmental Plant Biology Major fellowship to EA and MA, by the USDA NIFA Hatch project #IOW04341 and by State of Iowa funds and by the Crop Bioengineering Center of Iowa State University.

Intact Genomics obtained the license from Iowa State University to manufacture and sell this product.

Technical Support
Intact Genomics (IG®) is dedicated to customer satisfaction regarding the use of our products for your research needs.  Each new lot of our products is thoroughly tested to ensure it meets the high quality standards and provide excellent results. We appreciate your business and your feedback regarding the performance of our products in your applications.  Please follow the instructions carefully and contact us if additional assistance is needed.

IG Technical Support
Phone: (314) 942-3655 | Toll free: 855-835-7172

Legal Notices

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 Intact Genomics. This Product may be covered by pending or issued patents or may have certain limitations. Please contact us for more information. 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.

Product Use Limitation and Disclaimers
This product is intended for research purposes only, not for therapeutic or diagnostic purposes in humans or animals. This product contains chemicals which may be harmful if misused or making direct human contact.

Intact Genomics is dedicated to practicing and maintaining science and technology ethics. Buyer agrees to use the purchased materials in full compliance with applicable law and regulations.

Transformation Protocol

Use this procedure to transform ig® Thymidine-Auxotrophic EHA105Thy Agrobacterium Chemically Competent  Cells.

1) Place 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 50μl 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 50 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) Keep tubes on ice for 5 minutes, and then transfer to liquid nitrogen or dry ice for 5 minutes.

6) Incubate tubes  for additional 5 minutes in 37°C  water bath.

7) Immediately add 949 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 a 15ml culture  tube.

8) Incubate tubes at 30 °C for 3 hours at 200 RPM.

9) 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  50 μg/ml of thymidine, 15 μg/ml rifampicin and 50 μg/ml kanamycin. Use sterilized spreader or autoclaved ColiRoller plating beads to spread evenly.

10) Incubate the plates for 2 – 3 days at 30 °C.

Note: Liquid nitrogen  or dry ice is required but not provided, as well as 37oC water bath is required but not provided.


Manual - ig® Thymidine-Auxotrophic EHA105Thy Agrobacterium Chemically Competent Cells

MSDS - ig® Thymidine-Auxotrophic EHA105 Agrobacterium Chemically Competent Cells

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