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Title 

Improvement of the 3'-5' exonuclease activity of Taq DNA polymerase by protein engineering in the active site

Authors 

Young Hyun ParkHye Ja ChoiDae Sil LeeYoung Soo Kim

Publisher 

Springer Verlag (Germany)

Issue Date 

1997

Citation 

Molecules and Cells, vol. 7, no. 3, pp. 419-424

Keywords 

DNA directed DNA polymeraseDNA directed DNA polymerase betaTaq polymerasebinding siteprotein conformationprotein engineeringsite directed mutagenesisDNA Polymerase IDNA-Directed DNA Polymerase

Abstract 

Taq DNA polymerase from Thermus aquaticus has been shown to be very useful in the polymerase chain reaction method. Taq DNA polymerase has a domain at its amino terminus (residue 1 to 291) that has a 5′-3′ exonuclease activity, a 3′-5′ exonuclease domain in the middle (residue 292 to 423), and a domain at its C-terminus that catalyzes polymerase reactions. Taq DNA polymerase is classified into the polI family which is represented by E. coli DNA polymerase I. The three dimensional structural alignment of 3′-5′ exonuclease domains from the polI family, DNA polymerases leads us to understand why Taq DNA polymerase does not carry out proof-reading in the polymerase chain reaction. Three sequence motifs, called ExoI, II, and III must be present in order to carry out proof-reading by the 3′-5′ exonuclease reaction in DNA polymerization, but Taq DNA polymerase contains none of them. The key catalytic module in the 3′-5′ exonuclease is two metal ions chelated by active-site carboxylic amino acids. In order to render the 3′-5′ exonuclease activity in Taq DNA polymerase, a catalytic module was constructured in the active site by protein engineering. The mutant Taq DNA polymerase shows twice as much the 3′-5′ exonuclease activity as that of wild-type DNA polymerase.

ISSN 

1016-8478

Appears in Collections

1. Journal Articles > Journal Articles

Registered Date

2017-04-19


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