Cold-sensitive mutants of Taq DNA polymerase provide a hot start for PCR.

Abstract:

Although the thermophilic bacterium Thermus aquaticus grows optimally ...
Although the thermophilic bacterium Thermus aquaticus grows optimally at 70 degrees C and cannot grow at moderate temperatures, its DNA polymerase I has significant activity at 20-37 degrees C. This activity is a bane to some PCRs, since it catalyzes non-specific priming. We report mutations of Klentaq (an N-terminal deletion variant) DNA polymerase that have markedly reduced activity at 37 degrees C yet retain apparently normal activity at 68 degrees C and resistance at 95 degrees C. The first four of these mutations are clustered on the outside surface of the enzyme, nowhere near the active site, but at the hinge point of a domain that has been proposed to move at each cycle of nucleotide incorporation. We show that the novel cold-sensitive mutants can provide a hot start for PCR and exhibit slightly improved fidelity.

Polymerases:

Topics:

Fidelity

Status:

new topics/pols set partial results complete validated

Results:

Polymerase Reference Property Result Context
Taq pol I Cold-sensitive mutants of Taq DNA polymerase provide a hot start for PCR. Nucleotide Substitution Rate 0.00018 errors/bp Technique: Blue/white screening (0M Betaine, pWB407 template)
Taq pol I Cold-sensitive mutants of Taq DNA polymerase provide a hot start for PCR. Nucleotide Substitution Rate 0.00021 errors/bp Technique: Blue/white screening (1.3M Betaine, pWB407 template)
Klentaq1 Cold-sensitive mutants of Taq DNA polymerase provide a hot start for PCR. Nucleotide Substitution Rate 0.00015 errors/bp Technique: Blue/white screening (0M Betaine, pWB407 template)
Klentaq1 Cold-sensitive mutants of Taq DNA polymerase provide a hot start for PCR. Nucleotide Substitution Rate 0.00012 errors/bp Technique: Blue/white screening (1.3M Betaine, pWB407 template)
Klentaq1 Cold-sensitive mutants of Taq DNA polymerase provide a hot start for PCR. Nucleotide Substitution Rate 0.00013 errors/bp

Entry validated by:

Using Polbase tables:

Sorting:

Tables may be sorted by clicking on any of the column titles. A second click reverses the sort order. <Ctrl> + click on the column titles to sort by more than one column (e.g. family then name).

Filtering:

It is also possible to filter the table by typing into the search box above the table. This will instantly hide lines from the table that do not contain your search text.