T7 DNA polymerase
First Claim
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1. A method of amplification of a DNA sequence comprising annealing a first and second primer to opposite strands of a double stranded DNA sequence and incubating the annealed mixture with a T7- type DNA polymerase having less than 500 units of exonuclease activity per mg of polymerase, wherein said first and second primers anneal to opposite strands of said DNA sequence with their 3'"'"' ends directed towards each other after annealing, and with the DNA sequence to be amplified located between the two annealed primers.
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Abstract
This invention relates to T7-type DNA polymerases and methods for amplification of DNA, for example by polymerase chain reaction.
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24 Claims
- 1. A method of amplification of a DNA sequence comprising annealing a first and second primer to opposite strands of a double stranded DNA sequence and incubating the annealed mixture with a T7- type DNA polymerase having less than 500 units of exonuclease activity per mg of polymerase, wherein said first and second primers anneal to opposite strands of said DNA sequence with their 3'"'"' ends directed towards each other after annealing, and with the DNA sequence to be amplified located between the two annealed primers.
- 16. A method of amplification of a DNA sequence comprising annealing a first and second primer to opposite strands of a double stranded DNA sequence and incubating the annealed mixture with a processive T7-type DNA polymerase, having less than 50% of the exonuclease activity of the naturally occurring level of exonuclease activity of said polymerase.
- 20. A method of amplification of a DNA sequence comprising annealing a first and second primer to opposite strands of a double stranded DNA sequence and incubating the annealed mixture with a processive T7- type DNA polymerase, said polymerase having a level of exonuclease activity which is sufficiently low to permit the nucleotide base sequence of the DNA molecule to be determined with said polymerase.
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