Claims
- 1. A method for identifying a member of a mass-coded molecular library which is a ligand for a first biomolecule but is not a ligand for a second biomolecule, said method comprising the steps of:
(a) contacting the second biomolecule with a mass-coded molecular library, said mass-coded molecular library comprising compounds of the general formula XYn, wherein n is an integer from 2 to about 6, X is a scaffold and each Y is, independently, a peripheral moiety, wherein there exist at least about 250 distinct combinations of n peripheral moieties, and wherein each of at least about 90% of the combinations of n peripheral moieties has a molecular mass sum that is distinct from the molecular mass sum of all other combinations of n peripheral moieties, whereby members of the mass-coded molecular library which are ligands for the second biomolecule bind to the second biomolecule to form second biomolecule-ligand complexes and members of the mass-coded library which are not ligands for the second biomolecule remain unbound; (b) separating the second biomolecule-ligand complexes from the unbound members of the mass-coded molecular library; (c) contacting the first biomolecule with the unbound members of the mass-coded molecular library of step (b), whereby members of the mass-coded molecular library which are ligands for the first biomolecule bind to the first biomolecule to form first biomolecule-ligand complexes and members of the mass-coded library which are not ligands for the first biomolecule remain unbound; (d) dissociating the first biomolecule-ligand complexes; and (e) determining the molecular mass of each ligand for the first biomolecule; wherein each molecular mass determined in step (e) corresponds to a set of n peripheral moieties present in a ligand for the first biomolecule which is not a ligand for the second biomolecule, thereby identifying a member of the mass-coded combinatorial library which is a ligand for the first biomolecule but is not a ligand for the second biomolecule.
- 2. The method of claim 1 wherein the first and second biomolecules are each, independently, a protein or a nucleic acid molecule.
- 3. The method of claim 1 wherein the second biomolecule is immobilized on a solid support.
- 4. The method of claim 3 wherein the solid support is a water-insoluble matrix contained within a chromatographic column.
- 5. The method of claim 1 wherein a solution comprising the second biomolecule is contacted with the mass-coded combinatorial library to form, if one or more members of the combinatorial library are ligands for the second biomolecule, a solution comprising second biomolecule-ligand complexes and unbound members of the mass-coded combinatorial library.
- 6. The method of claim 5 wherein the unbound members of the mass-coded combinatorial library are separated from the second biomolecule-ligand complexes by directing the solution comprising second biomolecule-ligand complexes and the unbound members of the mass-coded combinatorial library through a size exclusion chromatography column, whereby the unbound members of the mass-coded combinatorial library elute from said column after the second biomolecule-ligand complexes.
- 7. The method of claim 5 wherein the unbound members of the mass-coded combinatorial library are separated from the second biomolecule-ligand complexes by contacting the solution comprising second biomolecule-ligand complexes and the unbound members of the mass-coded combinatorial library with a size-exclusion membrane, whereby the unbound compounds pass through said membrane and the second biomolecule-ligand complexes do not pass through said membrane.
- 8. The method of claim 1 wherein a solution comprising the first biomolecule is contacted with the unbound members of the mass-coded molecular library from step (b) to form, if one or more of the unbound members from step (b) are ligands for the first biomolecule, a solution comprising first biomolecule-ligand complexes and unbound members of the mass-coded combinatorial library.
- 9. The method of claim 8 wherein the unbound members of the mass-coded combinatorial library are separated from the first biomolecule-ligand complexes by directing the solution comprising first biomolecule-ligand complexes and the unbound members of the mass-coded combinatorial library through a size exclusion chromatography column, whereby the unbound members of the mass-coded combinatorial library elute from said column after the first biomolecule-ligand complexes.
- 10. The method of claim 8 wherein the unbound members of the mass-coded combinatorial library are separated from the first biomolecule-ligand complexes by contacting the solution comprising first biomolecule-ligand complexes and the unbound members of the mass-coded combinatorial library with a size-exclusion membrane, whereby the unbound compounds pass through said membrane and the first biomolecule-ligand complexes do not pass through said membrane.
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application is a divisional of Ser. No. 09/373,018, filed on Aug. 11, 1999, which is a divisional of Ser. No. 09/024,592, filed on Feb. 17, 1998, now U.S. Pat. No. 6,207,861, which claims priority from provisional application No. 60/070,456, filed on Jan. 5, 1998, the contents of each of which are incorporated herein by reference.
Provisional Applications (1)
|
Number |
Date |
Country |
|
60070456 |
Jan 1998 |
US |
Divisions (2)
|
Number |
Date |
Country |
Parent |
09373018 |
Aug 1999 |
US |
Child |
10131145 |
Apr 2002 |
US |
Parent |
09024592 |
Feb 1998 |
US |
Child |
09373018 |
Aug 1999 |
US |