Granted Patent
B2
US 12,195,730 · App. 17/899,860 · Granted Jan 14, 2025
High-throughput screening methods to identify small molecule targets
Inventors:
David Younger (Seattle, WA); Randolph Lopez (Seattle, WA); Arpita Sen (Seattle, WA); Ryan Emerson (Seattle, WA)
Assignee:
A-Alpha Bio, Inc.
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Abstract
Provided herein are methods for identifying pairs of protein binding partners, mutations of which may inform the discovery of pharmaceutically useful small molecules. The methods disclosed herein may allow for the adaptation of the native protein degradation system to modulate specific disease targets at the protein level, in particular, for targets that have long been considered undruggable.
Claims (17)
1. A method for assaying protein-protein interactions, the method comprising:
providing a plurality of polypeptide ubiquitin ligase species expressed and displayed on the surface of a first plurality of recombinant haploid yeast cells, wherein the first plurality of polypeptides ubiquitin ligase species comprises a library of wild- type polypeptide ubiquitin ligase species and mutant polypeptide ubiquitin ligase species that have been modified at one or more amino acid residue positions by mutagenesis;
providing a plurality of polypeptide substrate species expressed and displayed on the surface of a second plurality of recombinant haploid yeast cells, wherein the plurality of polypeptide substrate species comprises a library of wild-type polypeptide substrate species and mutant polypeptide substrates species that have been modified at one or more amino acid residue positions by mutagenesis;
combining the first plurality of recombinant haploid yeast cells and the second plurality of recombinant haploid yeast cells in a liquid medium to produce a culture;
growing the culture for a time and under conditions such that one or more interactions between one or more of the plurality of polypeptide ubiquitin ligase species and one or more of the plurality of polypeptide substrate species mediates one or more mating events between one or more of the first plurality of recombinant haploid yeast cells and one or more of the second plurality of recombinant haploid yeast cells to produce one or more diploid yeast cells;
determining, based on the number of mating events in the culture, the strength of the interactions between one or more of the plurality of polypeptide ubiquitin ligase species and one or more of the plurality of polypeptide substrate species; and
identifying pairs of polypeptides wherein one or both of one of the polypeptide ubiquitin ligase species and one of the polypeptide substrate species have been modified at one or more amino acid residue positions by mutagenesis and the strength of the interaction (K D ) between the polypeptide ubiquitin ligase species and the polypeptide substrate species is stronger or weaker than the interaction between the corresponding wild-type polypeptide species by at least 10%.
2. The method of claim 1 , wherein the strength of the interaction (K D ) between the polypeptide ubiquitin ligase species and the polypeptide substrate species is stronger or weaker than the interaction between the corresponding wild-type polypeptide species by at least 25%.
3. The method of claim 1 , wherein the one or more polypeptide ubiquitin ligase species are E3 ubiquitin ligase species.
4. The method of claim 1 wherein the one or more polypeptide substrate species comprise a known or predicted degron motif.
5. The method of claim 1 , wherein one or more of the first plurality of polypeptides have been modified at one or more amino acid residue positions by mutagenesis to introduce steric bulk to a domain of the polypeptide.
6. The method of claim 1 , wherein the method further comprises:
computationally modeling the interface between the polypeptide ubiquitin ligase species and the polypeptide substrate species that have been modified at one or more amino acid residue positions by mutagenesis in order to determine the structure of the interface between the polypeptide ubiquitin ligase species and the polypeptide substrate species.
7. The method of claim 1 , wherein the growing step further comprises growing the culture in the presence of one or more small molecules, proteins, peptides, pharmaceutical compound, or other chemical entities.
8. The method of claim 7 , wherein the identifying step further comprises identifying pairs of polypeptides wherein the strength of the interaction (K D ) between the polypeptide ubiquitin ligase species and the polypeptide substrate species is stronger or weaker in the presence of one or more small molecules, proteins, peptides, pharmaceutical compound, or other chemical entities than the interaction between the polypeptide ubiquitin ligase species and the polypeptide substrate species in the absence of the one or more small molecules, proteins, peptides, pharmaceutical compound, or other chemical entities by at least 10%.
9. The method of claim 1 , wherein the plurality of polypeptides ubiquitin ligase species are wild-type ubiquitin ligase species and the plurality of polypeptide substrate species are wild type polypeptide substrate species.
10. The method of claim 7 , wherein an interaction between one of the plurality of polypeptides ubiquitin ligase species and one of the plurality of polypeptide substrate species is detected in the presence of one or more small molecules, proteins, peptides, pharmaceutical compound while no interaction is detected between one of the plurality of polypeptides ubiquitin ligase species and one of the plurality of polypeptide substrate species in the absence of the small molecule, protein, peptide, pharmaceutical compound, or other chemical entity.
Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST
Recorded Jan 18, 2024
From: YOUNGER, DAVID; LOPEZ, RANDOLPH; SEN, ARPITA; EMERSON, RYAN
To: A-ALPHA BIO, INC.
Reel/Frame 066172/0632 →
Continuity (4)
Continuation
17607801
Provisional Application
63023181
· May 11, 2020
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Non-Final Office Action issued in related U.S. Appl. No. 17/516,237 dated Mar. 31, 2022.
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