Description
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