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DNA Polymerase I (E. coli) (RK20530)

DNA Polymerase I (E coli) is a DNA-dependent DNA polymerase with inherent 3´→ 5´ and 5´→ 3´ exonuclease activities. The 5´→ 3´ exonuclease activity removes nucleotides ahead of the growing DNA chain, allowing nick-translation.
It is applicable to nick translation of DNA for obtaining probes with a high specific activity and for second strand synthesis of cDNA.

DNA Polymerase I, Large (Klenow) Fragment (RK20525)

DNA Polymerase I, Large (Klenow) Fragment (about 68 kD) is a proteolytic product of E. coli DNA Polymerase I which retains polymerization and 3’→5′ exonuclease activity, but has lost 5’→3′ exonuclease activity. Klenow retains the polymerization fidelity of the holoenzyme without degrading 5′ termini.
It is applicable to DNA sequencing by the Sanger dideoxy method, fill-in of 5′ overhangs to form blunt ends, removal of 3′ overhangs to form blunt ends, second strand cDNA synthesis and second strand synthesis in mutagenesis protocols.

E. coli Poly(A) Polymerase (RK20591)

Poly(A) polymerase catalyzes the addition of AMP, converted from ATP, to the 3′ end of RNA in a template-independent manner.

Klenow Fragment 3’→5′ exo- (RK20526)

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 activity and has mutations (D355A, E357A) which abolish the 3’→ 5′ exonuclease activity. Klenow Fragment (3’→ 5′ exo) is isolated from a recombinant source. It generates probes using random primers and shows moderate strand displacement activity. It can be used in random primer labeling, DNA sequencing by the Sanger dideoxy method, second strand cDNA synthesis and second strand synthesis in mutagenesis protocols.

T4 DNA Polymerase (5,000 U/mL) (RK20539)

T4 DNA Polymerase catalyzes the synthesis of DNA in the 5’→3′ direction and requires the presence of template and primer. This enzyme has a 3’→5′ exonuclease activity which is much more active than that found in DNA Polymerase I (E. coli). Unlike E. coli DNA Polymerase I, T4 DNA Polymerase does not have a 5’→3′ exonuclease function.
It is applicable to 3′ overhang removal to form blunt ends, 5′ overhang fill-in to form blunt ends, single strand deletion subcloning, second strand synthesis in site-directed mutagenesis and probe labeling using replacement synthesis.