DNA Polymerase I, Large (Klenow) Fragment is a DNA polymerase that Polymerase I, but it contains the 3´ 5´ exodeoxyribonuclease activity.

Applications: Fill-in of 5´ overhangs (1). Synthesis of probes by random primers labeling method (2). Sequencing single- and double-stranded DNA (3). Site-directed mutagenesis.

Source: Purified from E. coli expressing the Klenow fragment on a plasmid.

Performance and Quality Testing: SDS-PAGE purity; single-stranded and double-stranded endodeoxyribonuclease and self-priming assays; performance evaluated in fill-in reaction.

Unit Definition: One unit incorporates 10 nmol of total deoxyribonucleotide into acid-precipitable material in 30 min. at 37°C using a
template•primer.