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Terminal Deoxynucleotidyl Transferase, Recombinant (rTDT)/ 1kU / Cat.#3020
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Terminal Deoxynucleotidyl Transferase (recombinant).  Store at –20¡É

#3020
1,000 U

1vial of 1,000 U/vial : 30 U/µl. Supplied with 2x0.5 ml of 5X rTDT Rxn Buffer with CoCl2

#3020L
5,000U

5 vials of #3020 : 30 U/µl. Supplied with 10x0.5ml of  5X rTDT Rxn Buffer with CoCl2


 

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.


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