Polymerase-tethered nucleotides for nucleic acid synthesis
Provided herein, among other things, is a conjugate comprising a polymerase and a nucleoside triphosphate, where the polymerase and the nucleoside triphosphate are covalently linked via a linker that comprises a cleavable linkage. A set of such conjugates, where the conjugates correspond to G, A, T (or U) and C is also provided. Methods for synthesizing a nucleic acid of a defined sequence are also provided. The conjugates can also be used for sequencing applications.
1. A conjugate comprising a nucleotide, a linker, and a polymerase capable of catalyzing the covalent addition of the nucleotide onto the 3′ end of a nucleic acid, wherein the linker tethers the nucleotide to the polymerase, and wherein the linker is bound to the nucleotide at the nucleobase, sugar, or the α-phosphate of the nucleotide.
2. The conjugate of claim 1 , wherein the linker is selectively cleavable.
3. The conjugate of claim 2 , wherein cleavage of the linker releases the polymerase from the nucleotide.
4. The conjugate of claim 3 , wherein cleavage of the linker leaves a scar on the nucleobase of the nucleotide, and wherein the scar comprises a part of the linker retained on the nucleobase after cleavage of the linker.
5. The conjugate of claim 4 , wherein the scar on the nucleobase is selectively removable.
6. The conjugate of claim 5 , wherein removal of the scar leaves a naturally occurring nucleobase.
7. The conjugate of claim 1 , wherein the nucleotide is a nucleoside triphosphate.
8. The conjugate of claim 1 , wherein the nucleotide comprises a nucleobase selected from the group consisting of adenine, cytosine, guanine, thymine, and uracil.
9. A method of nucleic acid synthesis, comprising:
providing a conjugate comprising a nucleotide, a linker, and a polymerase capable of catalyzing the covalent addition of the nucleotide onto the 3′ end of a nucleic acid, wherein the linker tethers the nucleotide to the polymerase, and wherein the linker is bound to the nucleotide at the nucleobase, the sugar, or the α-phosphate of the nucleotide; and
contacting a sample comprising the nucleic acid with the conjugate.
10. The method of claim 9 , wherein the linker is selectively cleavable.
11. The method of claim 10 , further comprising exposing said sample to conditions to cleave the linker to separate the polymerase from the nucleotide.
12. The method of claim 9 , wherein said polymerase catalyzes the covalent addition of the nucleotide onto the 3′ end of the nucleic acid to form an extended polynucleotide.
13. The method of claim 12 , further comprising cleaving said linker after said nucleotide of said conjugate is covalently bound to the 3′ end of the nucleic acid.
14. The method of claim 13 , wherein the cleavage of the linker releases the polymerase from the extended polynucleotide.
15. The method of claim 13 , wherein the extended polynucleotide comprises a scar following cleavage of the linker, and wherein the scar comprises a part of the linker retained on the nucleobase after cleavage of the linker.
16. The method of claim 15 , wherein the scar is selectively removable.
17. The method of claim 15 , further comprising removing said scar from said extended polynucleotide.
18. The method of claim 17 , wherein said extended polynucleotide comprises only naturally occurring nucleobases after removal of said scar.
19. The method of claim 9 , wherein said nucleotide is a nucleoside triphosphate before covalent addition to the 3′ end of the nucleic acid.
20. A method of synthesizing a polynucleotide having a defined sequence, comprising steps:
(a) contacting a substrate comprising a nucleic acid with a conjugate comprising nucleotide, a linker, and a polymerase capable of catalyzing the covalent addition of the nucleotide onto the 3′ end of a nucleic acid, wherein the linker tethers the nucleotide to the polymerase, and wherein the linker is bound to the nucleotide at the nucleobase, the sugar, or the α-phosphate of the nucleotide;
(b) exposing said substrate to conditions sufficient to cleave the linker to separate the polymerase from the nucleotide; and
(c) repeating steps (a) and (b) one or more times to synthesize the polynucleotide having a defined sequence.
21. The method of claim 20 , wherein the linker is selectively cleavable.
22. The method of claim 20 , wherein said polymerase catalyzes the covalent addition of the nucleotide onto the 3′ end of the nucleic acid.
23. The method of claim 22 , wherein said linker is cleaved after the covalent addition of the nucleotide onto the 3′ end of the nucleic acid.
24. The method of claim 23 , wherein the cleavage of the linker releases the polymerase from covalently bound nucleotide.
25. The method of claim 23 , wherein the nucleic acid comprises a scar following cleavage of the linker, and wherein the scar comprises a part of the linker retained on the nucleobase after cleavage of the linker.
26. The method of claim 25 , wherein the scar is selectively removable.
27. The method of claim 25 , further comprising removing said scar from said nucleic acid.
28. The method of claim 27 , wherein nucleic acid comprises only naturally occurring nucleobases after removal of said scar.
29. The method of claim 20 , wherein said nucleotide is a nucleoside triphosphate before covalent addition to the 3′ end of the nucleic acid.
30. A method of nucleic acid synthesis, comprising:
providing a conjugate comprising a nucleotide, a linker, and a polymerase capable of catalyzing the covalent addition of the nucleotide onto the 3′ end of a nucleic acid, wherein the linker tethers the nucleotide to the polymerase, and wherein the linker is bound to the nucleotide at the nucleobase, the sugar, or the α-phosphate of the nucleotide;
contacting a sample comprising the nucleic acid with the conjugate, wherein said polymerase catalyzes the covalent addition of the nucleotide onto the 3′ end of the nucleic acid to form an extended polynucleotide;
cleaving said linker after said nucleotide of said conjugate is covalently bound to the 3′ end of the nucleic acid, wherein said cleavage leaves a scar on the nucleobase of said covalently bound nucleotide; and
removing said scar from said nucleobase.