Protected dye-labeled reagents
Labeled nucleotide analogs comprising at least one avidin protein, at least one dye-labeled compound, and at least one nucleotide compound are provided. The analogs are useful in various fluorescence-based analytical methods, including the analysis of highly multiplexed optical reactions in large numbers at high densities, such as single molecule real time nucleic acid sequencing reactions. The analogs are detectable with high sensitivity at desirable wavelengths. They contain structural components that modulate the interactions of the analogs with DNA polymerase, thus decreasing photodamage and improving the kinetic and other properties of the analogs in sequencing reactions. Also provided are nucleotide and dye-labeled compounds of the subject analogs, as well as intermediates useful in the preparation of the compounds and analogs. Compositions comprising the compounds, methods of synthesis of the intermediates, compounds, and analogs, and mutant DNA polymerases are also provided.
1. A dye-labeled compound of structural formula (IIIA), (IIIB), (IIIC), (IIID), or (IIIE):
wherein
each L′ is independently a dye compound linker element;
each S is independently a shield element;
each A is independently an acceptor dye;
each D is independently a donor dye;
each B″ is independently a terminal coupling element;
each p is independently 0 or 1; and
each r is independently an integer from 0 to 8;
wherein the compound comprises at least one shield element, at least one acceptor dye, and at least one donor dye; and
wherein the compound does not contain a nucleoside.
2. The dye-labeled compound of claim 1 , wherein each r is independently an integer from 0 to 4.
3. The dye-labeled compound of claim 1 comprising at least two donor dyes.
4. The dye-labeled compound of claim 3 comprising at least four donor dyes.
5. The dye-labeled compound of claim 1 comprising at least two acceptor dyes.
6. The dye-labeled compound of claim 5 comprising at least four acceptor dyes.
7. The dye-labeled compound of claim 1 comprising at least two donor dyes and at least two acceptor dyes.
8. The dye-labeled compound of claim 1 , wherein at least one dye compound linker element comprises a shield element or a side chain element.
9. The dye-labeled compound of claim 1 , wherein the at least one shield element comprises a plurality of side chains.
10. The dye-labeled compound of claim 9 , wherein at least one side chain has a molecular weight of at least 300.
11. The dye-labeled compound of claim 9 , wherein all of the side chains have a molecular weight of at least 300.
12. The dye-labeled compound of claim 9 , wherein at least one side chain comprises a polyethylene glycol.
13. The dye-labeled compound of claim 9 , wherein at least one side chain comprises a negatively-charged component.
14. The dye-labeled compound of claim 13 , wherein the negatively-charged component comprises a sulfonic acid.
15. The dye-labeled compound of claim 9 , wherein at least one side chain comprises a substituted phenyl group.
16. The dye-labeled compound of claim 15 , wherein the at least one side chain comprises the structure:
wherein each x is independently an integer from 1 to 6.
17. The dye-labeled compound of claim 16 , wherein each x is independently an integer from 1 to 4.
18. The dye-labeled compound of claim 9 , wherein at least one side chain comprises a triazole.
19. The dye-labeled compound of claim 9 , wherein at least one side chain comprises the structure:
20. The dye-labeled compound of claim 1 , wherein the at least one shield element comprises the structure:
wherein each y is independently an integer from 1 to 6.
21. The dye-labeled compound of claim 1 , wherein the at least one shield element comprises the structure:
22. The dye-labeled compound of claim 1 comprising two terminal coupling elements.
23. The dye-labeled compound of claim 1 , wherein the terminal coupling element comprises a biotin moiety.
24. The dye-labeled compound of claim 23 , wherein the terminal coupling element comprises a bis-biotin moiety.
25. The dye-labeled compound of claim 1 , wherein the at least one acceptor dye or the at least one donor dye is a cyanine dye.
26. A labeled reagent composition comprising an avidin protein and the dye-labeled compound of claim 1 .
27. The dye-labeled compound of claim 1 , wherein the terminal coupling element comprises a first reactive functional group.
28. The dye-labeled compound of claim 1 , wherein the terminal coupling element comprises a residue derived from a first reactive functional group.
29. The dye-labeled compound of claim 28 , wherein the residue derived from the first reactive functional group is an amide moiety.
30. The dye-labeled compound of claim 28 , wherein the residue derived from the first reactive functional group results from a click reaction.
31. The dye-labeled compound of claim 1 , wherein the terminal coupling element is connected by the residue derived from the first reactive functional group to a nucleotide compound.