Purified thermostable DNA polymerase obtainable from thermococcus litoralis
First Claim
1. A thermostable DNA polymerase endogenous to Thermococcus litoralis, wherein said polymerase is substantially free of 3'"'"'-5'"'"' exonuclease activity and is substantially free of T. litoralis nucleic acids.
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Accused Products
Abstract
There is provided an extremely thermostable enzyme obtainable from Thermococcus litoralis. The thermostable enzyme has a molecular weight of about 90,000-95,000 daltons, a half-life of about 60 minutes at 100° C. in the absence of stabilizer, and a half-life of about 95 minutes at 100° C. in the presence of stabilizer, such as octoxynol (TRITON X-100) or bovine serum albumin. The thermostable enzyme possesses a 3'"'"'-5'"'"' proofreading exonuclease activity. The thermostable enzyme may be native or recombinant and may be used for second-strand cDNA synthesis in cDNA cloning, DNA sequencing, and DNA amplification.
112 Citations
39 Claims
- 1. A thermostable DNA polymerase endogenous to Thermococcus litoralis, wherein said polymerase is substantially free of 3'"'"'-5'"'"' exonuclease activity and is substantially free of T. litoralis nucleic acids.
- 3. An isolated DNA fragment consisting essentially of an about 1.3 kb DNA region encoding the amino-terminal portion of a thermostable DNA polymerase endogenous to Thermococcus litoralis.
- 7. An isolated DNA fragment consisting essentially of about a 1.6 kb DNA region encoding the intermediate portion of a thermostable DNA polymerase endogenous to Thermococcus litoralis exclusive of about a 5'"'"' terminal 1.3 kb and about a 3'"'"' terminal 1.9 kb portions of the coding region for the DNA polymerase.
- 11. An isolated DNA fragment consisting essentially of a 1.9 kb DNA region encoding a portion of the carboxyl terminal of a thermostable DNA polymerase endogenous to Thermococcus litoralis.
- 17. An isolated DNA fragment consisting essentially of a DNA region encoding a thermostable DNA polymerase endogenous to Thermococcus litoralis.
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32. A method for producing Thermococcus litoralis DNA polymerase comprising the steps of
(a) purifying total DNA from Thermococcus litoralis; -
(b) isolating DNA from the total DNA of step (a) which codes for the DNA polymerase; (c) removing an about 1.6 kb intervening DNA from said isolated DNA of step (b) wherein said intervening DNA corresponds to a region from about nucleotides 1761-1775 to about nucleotides 3384-3392 as depicted in SEQ ID NO;
1, whereby upon removal a consensus region corresponding to consensus region III of FIG. No. 7 is formed;(d) ligating the DNA of step (c) into an appropriate vector; (e) transforming a host with the vector of step (d); (f) cultivating the transformed host of step (e) under conditions suitable for expression of the T. litoralis DNA polymerase; (g) recovering the Thermococcus litoralis DNA polymerase. - View Dependent Claims (33, 34, 35)
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- 36. A substantially pure thermostable endonuclease endogenous to Thermococcus litoralis which cleaves double-stranded deoxynucleotide acid pBR322 at position 164 and positions 2411.
Specification