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Title 

Cloning, expression, and characterization of a family B-type DNA polymerase from the hypertheromophilic crenarchaeon Pyrobaculum arsenaticum and its application to PCR

Authors 

H J ShinS K LeeJ J ChoiSukhoon KohJ H LeeS J KimS T Kwon

Publisher 

The Korean Society for Applied Microbiology

Issue Date 

2005

Citation 

Journal of Microbiology and Biotechnology, vol. 15, no. 6, pp. 1359-1367

Keywords 

archaeaDNA polymeraseexonuclease activitypolymerase chain reactionpyrobaculum arsenaticumthermostable enzymeamino acidcibacron blue f3gadivalent cationDNA directed DNA polymerase beta

Abstract 

The gene encoding Pyrobaculum arsenaticum DNA polymerase (Par DNA polymerase) was cloned and sequenced. The gene consists of 2,361 by coding for a protein with 786 amino acid residues. The deduced amino acid sequence of Par DNA polymerase showed a high similarity to archaeal family B-type DNA polymerases (Group I), and contained all of the motifs conserved in the family B-type DNA polymerases for 3′→5′ exonuclease and polymerase activities. The Par DNA polymerase gene was expressed under the control of the T7lac promoter on the expression vector pET-22b(+) in Escherichia coli BL21-CodonPlus(DE3)-RP. The expressed enzyme was purified by heat treatment, and Cibacron blue 3GA and HiTrap™ Heparin HP column chromatographies. The optimum pH of the purified enzyme was 7.5. The enzyme activity was activated by divalent cations, and was inhibited by EDTA and monovalent cations. The half-life of the enzyme at 95°C was 6 h. Par DNA polymerase possessed associated 3′→5′ proofreading exonuclease activity, which is consistent with its deduced amino acid sequence. PCR experiment with Par DNA polymerase showed an amplified product, indicating that this enzyme might be useful in DNA amplification and PCR-based applications.

ISSN 

1017-7825

Appears in Collections

1. Journal Articles > Journal Articles

Registered Date

2017-04-19


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