The most popular approach for DNA PCR-labeling with Flu-dUTP or TAMRA-dUTP is based on the usage of dNTPs mixture which contains Flu (TAMRA)-dUTP and all the other 4 dNTs in regular concentrations. The molar ratio of dUTP/labeled dUTP (or dTTP/labeled dUTP) can vary from 3:1 to 1:1.

The incorporation efficiency depends mainly on the usage of dTTP or dUTP (the incorporation efficiency of dTTP is slightly better than those for dUTP) and on the enzyme used for PCR. Regular Taq DNA polymerase incorporates dUTP (and especially labeled dUTP) less efficient than Taq DNA Polymerase with modified active center (Taq-T from Bioron, cat# 117005, 117025).

Using Taq-T instead of regular Taq DNA Polymerase one can get more uniform incorporation of dUTP, labeled dUTP and other modified dNTPs into DNA.

In some special applications one may completely substitute dTTP by Flu (TAMRA)-dUTP to get DNA with all “T” substituted to Flu (TAMRA)-dUTP. Meanwhile, this 100% labeled DNA will be quite different from regular DNA in terms of electrophoresis mobility, hydrophobic properties, denaturation behavior etc. If all these points can be neglected, one can completely substitute dTTP by Flu (TAMRA)-dUTP.

Applications:

Fluorescent labelling of DNA by terminal deoxynucleotidyl transferase or DNA-polymerases

MW:

994 (Free Acid)

Purity:

> 96% (HPLC)

Concentration:

1 mg/ml, water solution

Storage conditions:

-20°C

The regular protocol for DNA-labeling with Flu (TAMRA)-dUTP by PCR (ratio of labeled dUTP/nonlabeled:dTTP is 1:2):

PCR should be performed as optimized on the regular dNTPs – with the same MgCl 2 concentration, with the temperatures and cycles optimized for the particular template and primers.