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Published on: April 17, 2017
Antigen Identification for Cell-Binding Antibodies Using Ligand-Directed Crosslinking and Biotin Transfer
Tammy-Lynn Tremblay1, Jennifer J Hill2
1Human Health Therapeutics, National Research Council Canada, Ottawa, ON, Canada.
This study introduces a new method using ligand-directed crosslinking and proteomic analysis to identify unknown cellular receptors for orphan ligands. The protocol helps pinpoint specific cell surface targets for antibodies identified through antibody library panning.
Area of Science:
- Biochemistry
- Proteomics
- Molecular Biology
Background:
- Antibody libraries often yield antibodies with unknown cellular targets.
- Identifying these cellular receptors is crucial for understanding antibody binding and function.
Purpose of the Study:
- To present a novel protocol for identifying unknown cellular receptors of orphan ligands.
- To enable the characterization of cell surface targets for antibodies generated via antibody library panning.
Main Methods:
- Synthesis and application of the aminooxy-sulfhydryl-biotin (ASB) trifunctional crosslinker.
- Ligand labeling with ASB, followed by cell binding assays.
- Biotin affinity purification and subsequent proteomic analysis of crosslinked cell surface proteins.
Main Results:
- Successful identification of cellular receptors for orphan ligands using the described method.
- Detailed protocol steps and optimization tips for proteomic analysis of crosslinked samples.
Conclusions:
- The presented protocol provides a robust approach for identifying unknown cellular receptors.
- This method facilitates the characterization of antibody-target interactions and advances orphan ligand research.
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