Description
The E17-1519 monoclonal antibody specifically recognizes Terminal deoxynucleotidyl transferase (TdT), which is also known as Terminal transferase, or DNA nucleotidylexotransferase (DNTT). TdT is a 60 kDa nuclear polymerase that catalyzes the template-independent addition of deoxynucleotides to the 3'-hydroxyl termini of single-stranded oligonucleotide primer segments. TdT can contribute to antigen receptor diversity by N region diversification of rearranging immunoglobulin heavy chain and T cell receptor gene segments during pre-B and pre-T cell development. It is also expressed by certain lymphomas and leukemias.
1. Harvest cultured target cells into a 50 ml conical centrifuge tube. Centrifuge at 1000 rpm for 10 minutes, aspirate and discard supernatant. 2. Wash cell pellet once with PBS and mix gently. Centrifuge at 1000 rpm for 10 minutes, aspirate and discard supernatant. 3. Fix the cells by adding 15-20 ml of 1% formaldehyde while vortexing the pellet and incubate for 20 minutes at room temperature. Centrifuge at 1000 rpm for 10 minutes, aspirate and discard supernatant. 4. Add 15-20 ml of 0.1% Triton™ X-100 in PBS and incubate for 5-10 minutes. Centrifuge at 1000 rpm for 10 minutes, aspirate and discard supernatant. 5. Resuspend cells in PBS + 1% FBS (wash buffer) to a final concentration of approximately 1 x 10^6 cells per 50 µl. 6. Prepare one tube with 50 µl of cell suspension and add 20 µl of fluorescent Anti-Human TdT antibody. Prepare another tube with 50 µl of cell suspension and add 20 µl of a matched fluorescent Ig isotype control. Mix the tube contents gently, and incubate in the dark at room temperature for 20-30 minutes. 7. Wash cells with 2 ml of wash buffer per tube. Centrifuge for 5 minutes at 1000 rpm, aspirate and discard supernatant. 8. Resuspend cells in 500 µl of wash buffer and analyze by flow cytometry.
Store undiluted at 4°C and protected from prolonged exposure to light. Do not freeze. The monoclonal antibody was purified from tissue culture supernatant or ascites by affinity chromatography. The antibody was conjugated to Alexa Fluor® 647 under optimum conditions, and unreacted Alexa Fluor® 647 was removed.
1. This reagent has been pre-diluted for use at the recommended Volume per Test. We typically use 1 × 10^6 cells in a 100-µl experimental sample (a test).
2. Please refer to www.bdbiosciences.com/us/s/resources for technical protocols.
3. Alexa Fluor® 647 fluorochrome emission is collected at the same instrument settings as for allophycocyanin (APC).
4. The Alexa Fluor®, Pacific Blue™, and Cascade Blue® dye antibody conjugates in this product are sold under license from Molecular Probes, Inc. for research use only, excluding use in combination with microarrays, or as analyte specific reagents. The Alexa Fluor® dyes (except for Alexa Fluor® 430), Pacific Blue™ dye, and Cascade Blue® dye are covered by pending and issued patents.
5. Alexa Fluor® is a registered trademark of Molecular Probes, Inc., Eugene, OR.
6. Triton is a trademark of the Dow Chemical Company.
7. Source of all serum proteins is from USDA inspected abattoirs located in the United States.
8. Caution: Sodium azide yields highly toxic hydrazoic acid under acidic conditions. Dilute azide compounds in running water before discarding to avoid accumulation of potentially explosive deposits in plumbing.
9. For fluorochrome spectra and suitable instrument settings, please refer to our Multicolor Flow Cytometry web page at www.bdbiosciences.com/colors.
10. An isotype control should be used at the same concentration as the antibody of interest.
