T4 Polynucleotide Kinase (NEB #M0201) can be used to 5' end label DNA and RNA because it catalyzes the transfer and exchange of phosphate from ATP to the 5´ -hydroxyl terminus of polynucleotides (double-and single-stranded DNA and RNA) and nucleoside 3´-monophosphates. Polynucleotide Kinase also catalyzes the removal of 3´-phosphoryl groups from 3´-phosphoryl polynucleotides, deoxynucleoside 3´-monophosphates and deoxynucleoside 3´-diphosphates (1).
T4 Polynucleotide Kinase (3' phosphatase minus) (NEB #M0236) is a modified version that exhibits full kinase activity with no 3´ phosphatase activity (2,3).
NEBCloner is a guide for selecting appropriate products and viewing protocols for steps in the cloning workflow. To help select the right kinase, choose "End Modification" on the tool to start.
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Phosphorylation is the process by which phosphate groups are added to a molecule by a kinase. The phosphorylation status of a fragment of DNA can influence its ability to proceed in reactions. Learn more about phosphorylation and kinases.