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Klenow Fragment

Large Fragment of DNA Polymerase I

recombinant, E. coli

Cat. No. Amount Price (EUR) Buy / Note
EN-148S 300 Units37,60 Add to Basket/Quote Add to Notepad
EN-148L 5 x 300 Units149,70 Add to Basket/Quote Add to Notepad

For general laboratory use.

Unit Definition: One unit is defined as the amount of enzyme required to convert 10 nmoles of dNTPs to an acid insoluble form in 30 minutes at 37 °C.

Shipping: shipped on gel packs

Storage Conditions: store at -20 °C
avoid freeze/thaw cycles

Shelf Life: 12 months

Form: liquid (Supplied in 100 mM KPO4 pH 6.5, 1 mM DTT and 50 % [v/v] glycerol)

Concentration: 5 units/μl


  • Fill-in of 5' overhangs to form blunt ends
  • Removal of 3' overhangs to form blunt ends

Klenow Fragment is the large fragment of DNA Polymerase I that retains its 5'→3' polymerase, 3'→5' exonuclease and strand displacement activities. The enzyme lacks the 5'→3' exonuclease activity of intact DNA polymerase I. Klenow retains the polymerization fidelity of the holoenzyme without degrading 5' termini.

Reaction conditions:

  • Dissolve 0.1 - 4 μg of digested DNA in 1x Reaction Buffer supplemented with 40 μM each dNTP
  • Add 1 unit Klenow Fragment per μg DNA

Incubate for 15 min. at 25 °C

Stop reaction by alternativly

  • add EDTA to 10 mM final concentration
  • Heat inactivation: 20 min. at 75 °C

10x Reaction Buffer:
500 mM Tris-HCl pH 7.6 at 25 °C, 50 mM MgCl2 and 10 mM DTT.

Excessive amounts of enzyme or longer reaction times may result in recessed ends due to the 3'→5' exonuclease activity of the enzyme.

Quality Control:
The enzyme is greater than 98 % pure as indicated by SDS-polyacrylamide gel electrophoresis and contains no detected endonuclease activity. Incubation of 10 units of Klenow with supercoiled plasmid DNA produced no nicked molecules after 20 hours at 37 °C as determined by agarose gel electrophoresis analysis.

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