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  1. May 2019
    1. The reaction was carried out by incubating at 37⁰C for 30 min. The reaction was stopped by adding 2μl of 0.5M EDTA, pH 8.0 and keeping on ice. A spin column was prepared using 1ml syringe and packed with sterile Sephadex G50 slurry and reaction mixture is applied on the top. The eluate is collected in different microcentrifuge tubes and radioactivity was counted using Geiger counter. The tube showing 7 to 9X106was used for experiment. The column containing the unincorporated [γ-32P] ATP was discarded in radioactive waste bin. The radiolabelled oligonucleotides were annealed with their corresponding complementary unlabelled oligonucleotides. A 50 fold molar excess of the latter was used for annealing for conversion of labelled single strand to double strand. Thetubes were kept in boiling waterbath for 3 min followed by room temperature for 30 min. The tubes were transferred to ice and the oligonucleotides were diluted to 4fmoles/μl using sterile H2O
    2. The oligonucleotides were labelled at their 5'end with 32P using T4 polynucleotide kinase (T4 PNK) enzyme in a reaction given belo