phi29 DNA polymerase mutants having increased thermostability and processivity
Mutants of bacteriophage phi29 DNA polymerase with increased protein stability and increased half-life, compared to wild type DNA polymerase. The disclosed mutants are more stable in reaction mixtures with or without DNA. The inventive phi29 DNA polymerase mutants generate more amplification product. The inventive phi29 DNA polymerase mutants amplify genomic DNA with less bias compared to wild type DNA polymerase. Selected mutations increase the affinity of polymerase for DNA template.
1. An isolated bacteriophage phi29 DNA polymerase comprising from one to thirteen mutations relative to wild-type phi29 DNA polymerase (SEQ ID NO: 10), wherein at least one mutation is selected from the group consisting of M8R, V51A, M97T, L123S, K209E, E221K, Q497P, and E515A.
2. The isolated bacteriophage phi29 DNA polymerase of claim 1 having increased protein thermostability compared to wild-type phi29 DNA polymerase.
3. The isolated bacteriophage phi29 DNA polymerase of claim 1 producing a higher amount of DNA amplification product compared to wild-type phi29 DNA polymerase.
4. The isolated bacteriophage phi29 DNA polymerase of claim 1 having a longer half-life compared to wild-type phi29 DNA polymerase.
5. The isolated bacteriophage phi29 DNA polymerase of claim 1 having a higher affinity to DNA compared to wild-type phi29 DNA polymerase.
6. The isolated bacteriophage phi29 DNA polymerase of claim 1 having a higher degree of DNA polymerase fidelity compared to wild-type phi29 DNA polymerase.
7. The isolated bacteriophage phi29 DNA polymerase of claim 1 having increased catalysis compared to wild-type phi29 DNA polymerase.
8. The isolated bacteriophage phi29 DNA polymerase of claim 1 where the bacteriophage phi29 DNA polymerase comprises the mutations M8R, V51A, M97T, G197D, and E221K compared to wild-type phi29 DNA polymerase.
9. The isolated bacteriophage phi29 DNA polymerase of claim 1 where the bacteriophage phi29 DNA polymerase comprises the mutations M8R, V51A, M97T, G197D, E221K, Q497P, K512E, and F526L compared to wild-type phi29 DNA polymerase.
10. The isolated bacteriophage phi29 DNA polymerase of claim 1 further comprising at least one mutation selected from the group consisting of G197D, E239G, K512E, and F526L.
11. The isolated bacteriophage phi29 DNA polymerase of claim 1 , wherein the amino acid sequence of the polymerase is selected from the group consisting of SEQ ID NOS 11-13, 16-39 and 40.
12. The isolated bacteriophage phi29 DNA polymerase of claim 1 , comprising the mutation M8R.
13. The isolated bacteriophage phi29 DNA polymerase of claim 1 , comprising the mutation V51A.
14. The isolated bacteriophage phi29 DNA polymerase of claim 1 , comprising the mutation M97T.
15. The isolated bacteriophage phi29 DNA polymerase of claim 1 , comprising the mutation L123S.
16. The isolated bacteriophage phi29 DNA polymerase of claim 1 , comprising the mutation K209E.
17. The isolated bacteriophage phi29 DNA polymerase of claim 1 , comprising the mutation E221K.
18. The isolated bacteriophage phi29 DNA polymerase of claim 1 , comprising the mutation Q497P.
19. The isolated bacteriophage phi29 DNA polymerase of claim 1 , comprising the mutation E515A.
20. An isolated bacteriophage phi29 DNA polymerase of SEQ ID NOS 14 or 15.