DNA Polymerases Having Improved Labeled Nucleotide Incorporation Properties
First Claim
1. An isolated thermophilic Taq DNA polymerase having reduced discrimination against incorporating a nucleotide labeled with a fluorescein-type dye, the polymerase comprising an amino acid substitution of a glutamic acid at position 615 of SEQ ID NO:
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Abstract
The present invention relates to mutant DNA polymerases that exhibit reduced discrimination against labeled nucleotides into polynucleotides. The DNA polymerases of the invention have at least one mutation in the nucleotide label interaction region of the enzyme such the mutation results in reduced discrimination against labeled nucleotides. The nucleotide label interaction regions is located at portions of the O-helix, (ii) the K helix, and (iii) the inter O—P helical loop of Taq DNA polymerase or analogous positions in other DNA polymerases. In addition to providing novel mutant DNA polymerases, the invention also provides polynucleotides encoding the subject mutant DNA polymerases. The polynucleotides provided may comprise expression vectors for the recombinant production of the mutant polymerases. The invention also provides host cells containing the subject polynucleotides. The invention also includes numerous methods of using the subject DNA polymerases, including uses for chain termination sequencing and PCR. Another aspect of the invention is to provide kits for synthesizing fluorescently labeled polynucleotides in accordance with the methods of the invention. Kits of the invention comprise a mutant DNA polymerase of the invention and a fluorescently labeled nucleotide that exhibits reduced discrimination with respect to the mutant DNA polymerase in the kit.
56 Citations
18 Claims
- 1. An isolated thermophilic Taq DNA polymerase having reduced discrimination against incorporating a nucleotide labeled with a fluorescein-type dye, the polymerase comprising an amino acid substitution of a glutamic acid at position 615 of SEQ ID NO:
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9. The isolated thermophilic DNA polymerase of claim 9, wherein the substitute amino is alanine, aspartic acid, isoleucine, or lysine.
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12. An expression vector comprising the polynucleotide of claim 12.
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13. A host cell comprising the expression vector of claim 13.
- 15. The method of claim 15 which is a chain terminating sequencing reaction.
Specification