Two Family B DNA Polymerases from Aeropyrum Pernix, an Aerobic Hyperthermophilic Crenarchaeote

Overview

Journal J Bacteriol

Publisher American Society for Microbiology

Specialty Microbiology

Date 1999 Sep 28

PMID 10498710

Citations 14

Authors

I K Cann

S Ishino

N Nomura

Y Sako

Y Ishino

Affiliations

Soon will be listed here.

Abstract

DNA polymerase activities in fractionated cell extract of Aeropyrum pernix, a hyperthermophilic crenarchaeote, were investigated. Aphidicolin-sensitive (fraction I) and aphidicolin-resistant (fraction II) activities were detected. The activity in fraction I was more heat stable than that in fraction II. Two different genes (polA and polB) encoding family B DNA polymerases were cloned from the organism by PCR using degenerated primers based on the two conserved motifs (motif A and B). The deduced amino acid sequences from their entire coding regions contained all of the motifs identified in family B DNA polymerases for 3'-->5' exonuclease and polymerase activities. The product of polA gene (Pol I) was aphidicolin resistant and heat stable up to 80 degrees C. In contrast, the product of polB gene (Pol II) was aphidicolin sensitive and stable at 95 degrees C. These properties of Pol I and Pol II are similar to those of fractions II and I, respectively, and moreover, those of Pol I and Pol II of Pyrodictium occultum. The deduced amino acid sequence of A. pernix Pol I exhibited the highest identities to archaeal family B DNA polymerase homologs found only in the crenarchaeotes (group I), while Pol II exhibited identities to homologs found in both euryarchaeotes and crenarchaeotes (group II). These results provide further evidence that the subdomain Crenarchaeota has two family B DNA polymerases. Furthermore, at least two DNA polymerases work in the crenarchaeal cells, as found in euryarchaeotes, which contain one family B DNA polymerase and one heterodimeric DNA polymerase of a novel family.

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