Modifiable chemical inducers of proximity and methods of using the same
Methods of reversibly inducing proximity of first and second target molecules in a sample are provided. Aspects of the methods include contacting the sample with a modifiable chemical inducer of proximity (MCIP) that reversibly induces proximity of the first and second target molecules, upon application of a stimulus that modifies the MCIP. Aspects of the invention further include methods for regulating a biological process in a cell. Aspects of the invention further include compositions, e.g., compounds and kits, etc., that find use in methods of the invention.
1. A method of reversibly inducing proximity of first and second target biomolecules in a sample, the method comprising:
(a) contacting the sample with a modifiable chemical inducer of proximity (MCIP) comprising a cleavable group and first and second binding moieties under conditions by which the first and second target biomolecules specifically non-covalently bind to the first and second binding moieties of the MCIP thereby inducing proximity of the first and second target biomolecules; and
(b) after proximity of the first and second target molecules is induced, applying a stimulus to the contacted sample to cleave the cleavable group to produce a modified MCIP that is no longer capable of maintaining proximity of the first and second target biomolecules thereby reversing the induction of proximity of the first and second target biomolecules,
wherein the first target biomolecule is a chimeric protein comprising a first ligand binding domain and a heterologous first protein domain, and the second target biomolecule is a chimeric protein comprising a second ligand binding domain and a heterologous second protein domain, wherein the first ligand binding domain is a FK506-binding protein (FKBP) domain, the second ligand binding domain is a FKBP-rapamycin-binding protein (FRB) domain, and the MCIP comprises a cleavable rapamycin analog.
2. The method of claim 1 , wherein the stimulus is a photon.
3. The method of claim 2 , wherein the cleavable group is photocleavable.
4. The method of claim 1 , wherein the stimulus is a chemical agent.
5. The method of claim 1 , wherein the stimulus is contact with an enzyme.
6. The method of claim 1 , further comprising evaluating the sample for proximity of the first and second target molecules.
7. The method of claim 6 , wherein the evaluating step is performed prior to the applying step.
8. The method of claim 1 , wherein the MCIP mediates direct binding of the first target protein with the second target protein.
9. The method of claim 1 , wherein the MCIP mediates indirect binding of the first target protein with the second target protein.
10. The method of claim 8 , wherein applying the stimulus dissociates the first target biomolecule from the second target biomolecule.
11. The method of claim 1 , wherein the modified MCIP has significantly reduced affinity for at least one of the first and second target biomolecules.
12. The method of claim 1 , wherein the sample is a cell comprising the first target biomolecule and the second target biomolecule.
13. A method for regulating a biological process in a cell, the method comprising:
(a) contacting a cell comprising a first target biomolecule and a second target biomolecule with a MCIP comprising a cleavable group and first and second binding moieties under conditions by which the first and second target biomolecules specifically non-covalently bind to the first and second binding moieties of the MCIP to induce a biological process in the cell; and
(b) after proximity of the first and second target molecules is induced, applying a stimulus to cleave the cleavable group to produce a modified MCIP that is no longer capable of maintaining proximity of the first and second target biomolecules thereby reversing the induction of proximity of the first and second target biomolecules;
to regulate the biological process in the cell,
wherein the first target biomolecule is a chimeric protein comprising a first ligand binding domain and a heterologous first protein domain, and the second target biomolecule is a chimeric protein comprising a second ligand binding domain and a heterologous second protein domain, wherein the first ligand binding domain is a FK506-binding protein (FKBP) domain, the second ligand binding domain is a FKBP-rapamycin-binding protein (FRB) domain, and the MCIP comprises a cleavable rapamycin analog.
14. The method of claim 13 , wherein the first and second target molecules are expressed by the cell.
15. The method of claim 13 , wherein the stimulus is a photon.
16. The method of claim 15 , wherein the cleavable group is photocleavable.
17. The method of claim 13 , wherein the stimulus is a chemical agent.
18. The method of claim 13 , wherein the stimulus is contact with an enzyme.