Description:
T4 Polynucleotide Kinase (PNK) catalyzes the transfer of the terminal phosphate of ATP to
5 hydroxyl termini of polynucleotides such as DNA and RNA, oligonucleotides and 3 mononucleotides(2). In the presence of ADP, it will also catalyze the exchange of 5 terminal phosphate groups and ATP. It also possesses a 3 phosphatase(4,5,8,9) and 2,3 cyclic phosphodiesterase activity(3). This enzyme is commonly used to label DNA or RNA with 32P or 33P at 5 ends(6).