Multi-color time resolved fluorophores based on macrocyclic lanthanide complexes
The present invention provides a novel class of macrocyclic compounds as well as complexes formed between a metal (e.g., lanthanide) ion and the compounds of the invention. Preferred complexes exhibit high stability as well as high quantum yields of lanthanide ion luminescence in aqueous media without the need for secondary activating agents. Preferred compounds incorporate hydroxy-isophthalamide moieties within their macrocyclic structure and are characterized by surprisingly low, non-specific binding to a variety of polypeptides such as antibodies and proteins as well as high kinetic stability. These characteristics distinguish them from known, open-structured ligands.
1. A compound having a structure according to Formula I:
wherein
each Z is a member independently selected from O and S;
L 1 , L 2 , L 3 , L 4 , L 5 , L 6 , L 7 , L 8 , L 9 and L 10 are linker groups independently selected from substituted or unsubstituted C 1 to C 6 alkyl;
A 1 , A 2 , A 3 and A 4 are members independently selected from the general structure:
wherein
each R 1 is a member independently selected from H, an enzymatically labile group, a hydrolytically labile group, a metabolically labile group and a single negative charge; and
each R 5 , R 6 and R 7 is a member independently selected from H, substituted or unsubstituted alkyl, substituted or unsubstituted heteroalkyl, halogen, CN, CF 3 , acyl, —SO 2 NR 17 R 18 , —NR 17 R 18 , —OR 17 , —S(O) 2 R 17 , —COOR 17 , —S(O) 2 OR 17 , —OC(O)R 17 , —C(O)NR 17 R 18 , —NR 17 C(O)R 18 , —NR 17 SO 2 R 18 , and NO 2 ,
wherein
R 6 and a member selected from R 5 , R 7 and combinations thereof are optionally joined to form a ring system which is a member selected from substituted or unsubstituted cycloalkyl, substituted or unsubstituted heterocycloalkyl, substituted or unsubstituted aryl and substituted or unsubstituted heteroaryl; and
R 17 and R 18 are members independently selected from H, substituted or unsubstituted alkyl, substituted or unsubstituted heteroalkyl, substituted or unsubstituted aryl, substituted or unsubstituted heteroaryl and substituted or unsubstituted heterocycloalkyl, and R 17 and R 18 , together with the atoms to which they are attached, are optionally joined to form a 5- to 7-membered ring; and
wherein at least one moiety selected from L 1 , L 2 , L 3 , L 4 , L 5 , L 6 , L 7 , L 8 , L 9 , and L 10 is substituted with:
wherein
L F is an acceptor-linker;
F is a fluorophore bound to L F through a linkage fragment; and
FM is a functional moiety,
wherein said functional moiety comprises a reactive functional group, or said functional moiety is bound to a carrier moiety or solid support through a linkage fragment.
2. The compound according to claim 1 , having a structure, which is a member selected from:
wherein
L 11 is a member selected from a acyl, substituted alkyl, substituted heteroalkyl, substituted aryl, substituted heteroaryl, substituted heterocycloalkyl and nucleic acid; and
X is a linkage fragment covalently binding said fluorophore to L 11 .
3. The compound according to claim 1 , wherein said linker moieties L 1 , L 2 , L 3 , L 4 , L 5 , L 6 , L 7 , L 8 , L 9 and L 10 are members independently selected from substituted or unsubstituted ethyl.
4. A luminescent complex formed between at least one metal ion and a compound according to claim 1 .
5. The complex according to claim 4 , wherein said metal ion is a lanthanide ion.
6. The complex according to claim 5 , wherein said lanthanide is a member selected from neodymium (Nd), samarium (Sm), europium (Eu), terbium (Tb), dysprosium (Dy) and ytterbium (Yb).
7. A method of detecting an analyte in a sample, said method comprising:
(a) combining the sample and the complex according to claim 4 ;
(b) exciting the complex; and
(c) detecting luminescence from the complex, thereby detecting said analyte.
8. The method according to claim 7 wherein said analyte is a nucleic acid.
9. The method of claim 7 wherein the method is performed in vivo.
10. The method of claim 7 wherein the sample contains a living cell.
11. The method of claim 8 wherein said nucleic acid comprises a genetic point mutation, deletion or insertion relative to a control nucleic acid.
12. The method of claim 8 wherein the detection of said nucleic acid indicates the presence of a cancer in the sample.
13. The method of claim 8 wherein the detection of said nucleic acid indicates an alteration of the expression pattern of said nucleic acid in response to an external stimulus.
14. The method of claim 7 wherein the detecting is performed with single- or multiple-photon microscopy, time-resolved fluorescence microscopy or fluorescence endoscopy.
15. The compound according to claim 1 , having the structure:
16. The compound according to claim 15 , having the structure:
wherein a, b, and c are integers independently selected from 0 to 15.
17. The compound according to claim 16 , having the structure:
18. The compound according to claim 1 , wherein the functional moiety is attached to a carrier moiety.
19. The compound according to claim 18 , wherein said carrier moiety is a member selected from a nucleic acid, peptide, antibody, antibody fragment, antigen, receptor, lectin, saccharide and lipid.
20. The compound according to claim 1 , having the structure:
wherein a, b, and c are integers independently selected from 0 to 15; and
CM is said carrier moiety or solid support.
21. The complex according to claim 6 , wherein said lanthanide is terbium (Tb).
22. A complex formed between a lanthanide ion and a compound according to claim 15 .
23. The complex according to claim 22 , wherein said lanthanide is a member selected from terbium (Tb), samarium (Sm), dysprosium (Dy), and europium (Eu).
24. The complex according to claim 23 , wherein said lanthanide is terbium (Tb).
25. A mixture comprising at least two complexes according to claim 4 , wherein the fluorophore of each complex is different; and each fluorophore is excited by a separate emission band of the complex formed between the moiety the fluorophore is attached to and the at least one metal ion.