Description
Terminal Deoxynucleotidyl Transferase, Recombinant, catalyzes the repetitive addition of mononucleotides to the terminal 3¢¥-OH of a DNA initiator accompanied by the release of inorganic phosphate. Single-stranded DNA is preferred as an initiator. Polymerization is not template-dependent. The addition of 1mM Co2+ (as CoCl2) in the reaction buffer allows the tailing of 3¢¥-ends with varying degrees of efficiency.
Features
- Tails Any Type of 3¢¥ End: The presence of 1mM CoCl2 in the reaction buffer allows the tailing of any type of 3¢¥ end (3¢¥ and 5¢¥ overhangs or blunt ends)
- Useful for Apoptotic DNA Labeling
- Positive Control DNA: Positive Control Oligo(dT)15 Primer, which can be used to monitor incorporation rates, is included
- Provided with 5X Reaction Buffer: 500mM cacodylate buffer (pH 6.8 at 25¡ÆC), 5mM CoCl2, 0.5mM DTT
Applications
- Tailing reactions to add complementary homopolymer tails to DNA vectors and cDNA
- 3¢¥ end-labeling of modified nucleotides (e.g. fluorescein-, biotin-, aminoallyl-labeled nucleotides)
- TUNEL assays
Source
Recombinant E. coli strain with a cloned gene encoding calf thymus terminal deoxynucleotidyl transferase
Concentration and Storage Conditions
Concentration, 30 U/µl
Store at –20¡ÆC.
Storage Buffer
50mM potassium phosphate (pH 6.4), 100mM NaCl, 1mM ¥â-mercaptoethanol, 0.1% Tween¢ç 20 and 50% glycerol.
Reaction Buffer (x5)
500mM Cacodylate buffer (pH6.8), 5mM CoCl2 and 0.5mM DTT
Unit Definition
One unit of activity catalyzes the transfer of 0.5 picomoles of ddATP to oligo(dT)16 per minute at 37¡ÆC in 1X Terminal Transferase Buffer. The resulting oligo(dT)17 is measured by HPLC.
Quality Control Tests
Activity, endonuclease, DNase, RNase, 3¢¥ end-labeling, apoptotic DNA end-labeling.
Protocol : [alpha-32P]dNTP to the 3¢¥ Termini of Single-Stranded DNA Primers
1. Set up the reaction mixture :
Terminal Transferase 5X Buffer 4.0µl
primer 2pmol
[¥á-32P]dATP (800Ci/mmol, 10mCi/ml) 1.6µl
rec. Terminal Deoxynucleotidyl Transferase 10–20 units
water to a final volume of 20µl
2. Incubate at 37¡ÆC for 60 minutes.
3. Stop the reaction by heating at 70¡ÆC for 10 minutes.