Polymerase compositions, methods of making and using same
The present disclosure provides compositions, methods, kits, systems and apparatus that are useful for nucleic acid polymerization. In particular, modified polymerases and biologically active fragments thereof are provided that allow for nucleic acid amplification. In some aspects, the disclosure provides modified polymerases having lower systematic error as compared to a reference polymerase. In one aspect, the disclosure relates to modified polymerases useful for nucleic acid sequencing, genotyping, copy number variation analysis, paired-end sequencing and other forms of genetic analysis. In some aspects, the disclosure relates to modified polymerases useful for the generation of nucleic acid libraries or nucleic acid templates. In some aspects, the disclosure relates to the identification of homologous amino acid mutations that can be transferred across classes or families of polymerases to provide novel polymerases with altered properties.
1. A composition comprising a non-naturally occurring polypeptide comprising an amino acid sequence at least 90% identical to SEQ ID NO: 1 wherein the amino acid sequence has a methionine at position 281 of SEQ ID NO: 1 and an arginine at position 487 of SEQ ID NO: 1, wherein the polypeptide has DNA polymerase activity.
2. The composition of claim 1 , wherein the amino acid sequence further comprises an arginine at position 46 of SEQ ID NO: 1, a glutamine at position 446 of SEQ ID NO: 1 and an arginine at position 572 of SEQ ID NO: 1.
3. The composition of claim 1 , wherein the amino acid sequence is at least 92% identical to SEQ ID NO: 1.
4. The composition of claim 1 , wherein the amino acid sequence is at least 95% identical to SEQ ID NO: 1.
5. The composition of claim 1 , wherein the amino acid sequence is at least 99% identical to SEQ ID NO: 1.
6. The composition of claim 1 , wherein the polypeptide comprises an amino acid sequence of SEQ ID NO: 37.
7. The composition of claim 1 , wherein the polypeptide comprises an amino acid sequence having at least 92% identity to SEQ ID NO: 37.
8. The composition of claim 1 , wherein the polypeptide comprises an amino acid sequence having at least 95% identity to SEQ ID NO: 37.
9. The composition of claim 1 , wherein the polypeptide comprises an amino acid sequence having at least 98% identity to SEQ ID NO: 37.
10. The composition of claim 1 , wherein the polypeptide comprises an amino acid sequence having at least 99% identity to SEQ ID NO: 37.
11. The composition of claim 1 , wherein the polymerase activity is measured as raw read accuracy, signal-to-noise ratio and/or the number of AQ20 reads of the results of nucleotide sequence determinations of nucleic acid templates in a sequencing reaction using the polypeptide to perform nucleotide polymerization.
12. A method for performing DNA polymerization comprising:
(a) providing a reaction mixture comprising the composition of claim 1 , and a nucleic acid hybridized to a primer; and
(b) contacting the nucleic acid with at least one type of nucleotide, wherein the contacting includes incorporating at least one nucleotide onto the primer thereby generating an extended primer product.
13. The method of claim 12 , wherein the method further includes detecting the presence of the extended primer product in the reaction mixture, thereby determining whether nucleotide incorporation has occurred.
14. The method of claim 13 , wherein the contacting and the detecting are repeated more than once, thereby detecting a plurality of nucleotide incorporations.
15. The method of claim 14 , wherein the method further includes identifying at least one of the plurality of nucleotide incorporations.
16. The method of claim 12 , wherein the polymerization method includes PCR, qPCR, bridge PCR, RT-PCR, ligation mediated PCR, isothermal amplification, or emulsion PCR.
17. The method of claim 15 , wherein the nucleic acid is a template nucleic acid and the primer is a sequencing primer.
18. The method of claim 17 , wherein the contacting, detecting, and identifying steps are repeated more than once, thereby identifying a plurality of sequential nucleotide incorporations and determining the sequence of the template nucleic acid.
19. A method for performing DNA polymerization comprising:
(a) providing a reaction mixture comprising the composition of claim 2 , and a nucleic acid hybridized to a primer;
(b) contacting the nucleic acid with at least one type of nucleotide, wherein the contacting includes incorporating at least one nucleotide onto the primer thereby generating an extended primer product; and
(c) detecting the presence of the extended primer product in the reaction mixture, thereby determining whether nucleotide incorporation has occurred.