Characterization of DNA Polymerase from Pyrococcus Sp. Strain KOD1 and Its Application to PCR

Overview

Journal Appl Environ Microbiol

Specialties Environmental Health
Microbiology

Date 1997 Nov 15

PMID 9361436

Citations 77

Authors

M Takagi

M Nishioka

H Kakihara

M Kitabayashi

H Inoue

B Kawakami

M Oka

T Imanaka

Affiliations

Soon will be listed here.

Abstract

The DNA polymerase gene from the archaeon Pyrococcus sp. strain KOD1 (KOD DNA polymerase) contains a long open reading frame of 5,013 bases that encodes 1,671 amino acid residues (GenBank accession no. D29671). Similarity analysis revealed that the DNA polymerase contained a putative 3'-5' exonuclease activity and two in-frame intervening sequences of 1,080 bp (360 amino acids; KOD pol intein-1) and 1,611 bp (537 amino acids; KOD pol intein-2), which are located in the middle of regions conserved among eukaryotic and archaeal alpha-like DNA polymerases. The mature form of the DNA polymerase gene was expressed in Escherichia coli, and the recombinant enzyme was purified and characterized. 3'-5' exonuclease activity was confirmed, and although KOD DNA polymerase's optimum temperature (75 degrees C) and mutation frequency (3.5 x 10(-3)) were similar to those of a DNA polymerase from Pyrococcus furiosus (Pfu DNA polymerase), the KOD DNA polymerase exhibited an extension rate (100 to 130 nucleotides/s) 5 times higher and a processivity (persistence of sequential nucleotide polymerization) 10 to 15 times higher than those of Pfu DNA polymerase. These characteristics enabled the KOD DNA polymerase to perform a more accurate PCR in a shorter reaction time.

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