Klenow Fragment, exo-, is the large fragment of DNA polymerase I . It exhibits 5'3' polymerase activity, but lacks the 3'5' and 5'3' exonuclease activities of DNA Polymerase I. The 3'5' exonuclease activity of the enzyme is eliminated by mutations in the 3'5'-exonuclease active sit.
- Lacks 3'→5' exonuclease activity
- Incorporates modified nucleotides (e.g., Cy3-, Cy5-, fluorescein-, rhodamine-, aminoallyl-, biotin-labeled nucleotides)
- Active in restriction enzyme, PCR, and RT buffers
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