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Pubmed ID :12963343
Publication Date : //

Cloning, expression, and purification of the His6-tagged hyper-thermostable dUTPase from Pyrococcus woesei in Escherichia coli: application in PCR.


The gene encoding dUTPase from Pyrococcus woesei was cloned into Escherichia coli expression system. It shows 100% gene identity to homologous gene in Pyrococcus furiosus. The expression of N-terminal His(6)-tagged Pwo dUTPase was performed in E. coli BL21(DE3)pLysS and E. coli Rosetta(DE3)pLysS strain that contains plasmid encoding additional copies of rare E. coli tRNAs. E. coli Rosetta(pLysS) strain was found with two times higher expression yield of His(6)-tagged Pwo dUTPase than E. coli BL21(DE3)pLysS. The His(6)-tagged Pwo dUTPase was purified on Ni(2+)-IDA-Sepharose, dialyzed, and the enzyme activity was investigated. We found that His(6)-tag domain has no influence on dUTP hydrolytic activity. dUTP is generated during PCR from dCTP, which inhibits the polymerization of DNA catalyzed by DNA polymerase with 3(')-5(') exonuclease activity. We observed that the thermostable His(6)-tagged Pwo dUTPase used for the polymerase chain reaction with P. woesei DNA polymerase improves the efficiency of PCR and it allows for amplification of longer targets.

Authors : Dabrowski Sławomir , Kiaer Ahring Birgitte ,

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