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Klenow Fragment (3'->5' exo-)

Catalog #: EG-1056


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Description

Klenow Fragment (3´→ 5´ exo-) is an N-terminal truncation of DNA Polymerase I which retains polymerase activity, but has lost the 5´→ 3´ exonuclease (nick-translation) activity, and proofreading (3′→ 5′) exonuclease activity due to two amino acids mutations (D355A, E357A).

Applications
  • Random-primed DNA labeling
  • DNA sequencing by the Sanger dideoxy method
  • Second strand cDNA synthesis
  • Labeling by fill-in 5'-overhangs of dsDNA
  • Strand displacement amplification (SDA)
Source A recombinant E. coli strain carrying the mutated Klenow Fragment of E coli PolA gene.
Unit Definition

One unit is defined as the amount of enzyme that will incorporate 10 nmol of dNTP into acid insoluble material in 30 minutes at 37°C.

Components
  • Klenow Fragment exo-: 5,000 U/ml in 25 mM Tris-HCl, 1 mM DTT, 0.1 mM EDTA, 50% Glycerol, pH 7.4 @ 25°C
  • 10X Reaction Buffer: 500 mM NaCl, 100 mM Tris-HCl, 100 mM MgCl2, 10 mM DTT, pH 7.9 @ 25°C
Quality Control
  • The absence of endo- and exodeoxyribonucleases confirmed by appropriate quality tests.
  • Functionally tested in random-primed DNA labeling.
Storage Condition

-20 °C


     
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