Cloned DNA polymerases from Thermotoga and mutants thereof
First Claim
1. A substantially pure Thermotoga neapolitana (Tne) DNA polymerase.
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Abstract
The invention relates to a substantially pure thermostable DNA polymerase from Thermotoga (Tne and Tma) and mutants thereof. The Tne DNA polymerase has a molecular weight of about 100 kilodaltons and is more thermostable than Taq DNA polymerase. The mutant DNA polymerase has at least one mutation selected from the group consisting of (1) a first mutation that substantially reduces or eliminates 3′→5′ exonuclease activity of said DNA polymerase; (2) a second mutation that substantially reduces or eliminates 5′→3′ exonuclease activity of said DNA polymerase; (3) a third mutation in the O helix of said DNA polymerase resulting in said DNA polymerase becoming non-discriminating against dideoxynucleotides. The present invention also relates to the cloning and expression of the wild type or mutant DNA polymerases in E. coli, to DNA molecules containing the cloned gene, and to host cells which express said genes. The DNA polymerases of the invention may be used in well-known DNA sequencing and amplification reactions.
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Citations
39 Claims
- 1. A substantially pure Thermotoga neapolitana (Tne) DNA polymerase.
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5. A Tne DNA polymerase mutant which is modified at least one way selected from the group consisting of
(a) to reduce or eliminate the 3′ - →
5′
exonuclease activity of the polymerase;
(b) to reduce or eliminate the 5′
→
3′
exonuclease activity of the polymerase; and
(c) to reduce or eliminate discriminatory behavior against a dideoxynucleotide. - View Dependent Claims (6, 7, 8, 9, 11, 12, 13, 14, 15, 16)
- →
-
10. The Tne DNA polymerase as claimed in claim 10, wherein said mutation is a Phe730→
- Tyr730 substitution.
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26. The method of claim 26, wherein said deoxyribonucleoside triphosphates are selected from the group consisting of dATP, dCTP, dGTP, dTTP, dITP, 7-deaza-dGTP, dUTP, [α
- -S]dATP, [α
-S]dTTP, [α
-S]dGTP, and [α
-S]dCTP. - View Dependent Claims (27, 28, 29)
- -S]dATP, [α
-
31. The method of claim 31, wherein said deoxyribonucleoside triphosphates are selected from the group consisting of dATP, dCTP, dGTP, dTTP, dITP, 7-deaza-dGTP, dUTP, [α
- -S]dATP, [α
-S]dTTP, [α
-S]dGTP, and [α
-S]dCTP.
- -S]dATP, [α
-
34. A mutant Tne DNA polymerase having substantially reduced or eliminated 5′
- -3′
exonuclease activity, wherein at least one of the amino acids corresponding to Asp8, Glu112, Asp114, Asp115, Asp137, Asp139, Gly102, Gly187, or Gly195 has been mutated.
- -3′
-
35. A vector coding for the mutant DNA polymerase of claim 35.
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36. A host cell comprising the vector of claim 36.
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37. A method of producing a mutant Tne DNA polymerase having substantially reduced or eliminated 5′
- -3′
exonuclease activity, wherein at least one of the amino acids corresponding to Asp8, Glu112, Asp114, Asp115, Asp137, Asp139, Gly102, Gly187, or Gly195 has been mutated, comprising(a) culturing the host cell of claim 37;
(b) expressing the mutant DNA polymerase;
amd(c) isolating said mutant DNA polymerase.
- -3′
Specification