Polymerases with charge-switch activity and methods of generating such polymers
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Abstract
This invention provides DNA polymerases with mutations in the charge-switch nucleotide interaction region that increase activity for charge-switch nucleotides. Such polymerases can be generated by introducing mutations in specific residues which are identified as being in the appropriate region through structural models, by homology to polymerases with known structures, or experimental analysis. In some embodiments, the mutant DNA polymerases have additional mutations that decrease activity for non-charge-switch nucleotides and mutations that decrease exonuclease activity. In another aspect, the invention provides methods of sequencing a target nucleic acid with the above described mutated DNA polymerases. In yet another aspect, the invention provides methods of generating polypeptides having charge-switch nucleotide polymerase activity by introducing “random” mutations and selecting those mutated polypeptides that encode polypeptides having charge-switch nucleotide activity
121 Citations
56 Claims
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1-36. -36. Cancel
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37. A purified mutant DNA polymerase having at least one mutation in a nucleotide γ
- -phosphate region, wherein said mutant DNA polymerase has increased activity for a γ
-phosphate labeled nucleotide compared to a naturally occurring DNA polymerase, and wherein said mutant DNA polymerase is capable of synthesizing DNA at a rate of at least 1 nucleotide per second. - View Dependent Claims (38, 39, 40, 41, 42, 43)
- -phosphate region, wherein said mutant DNA polymerase has increased activity for a γ
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44. A purified mutant DNA polymerase having at least one mutation in a nucleotide γ
- -phosphate region, wherein said mutant DNA polymerase has increased activity for a γ
-phosphate labeled nucleotide compared to a naturally occurring DNA polymerase, and wherein said mutant DNA polymerase is capable of synthesizing DNA at a rate of at least 10 nucleotides per second. - View Dependent Claims (45, 46, 47, 48, 49, 50)
- -phosphate region, wherein said mutant DNA polymerase has increased activity for a γ
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51. A purified mutant DNA polymerase having at least one mutation in a nucleotide γ
- -phosphate region, wherein said mutant DNA polymerase has increased activity for a nucleotide coupled to a detectable moiety at a γ
-phosphate compared to a naturally occurring DNA polymerase, and wherein said mutation is found in regions of a nucleotide binding pocket of said DNA polymerase, wherein said pocket interacts with said detectable moiety of the nucleotide. - View Dependent Claims (52, 53, 54, 55, 56)
- -phosphate region, wherein said mutant DNA polymerase has increased activity for a nucleotide coupled to a detectable moiety at a γ
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