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Updated: Jul 20, 2026
Scalable High Throughput Selection From Phage-displayed Synthetic Antibody Libraries
Published on: January 17, 2015
Using phage display to select antibodies recognizing post-translational modifications independently of sequence
John W Kehoe1, Nileena Velappan, Monica Walbolt
1Department of Molecular and Cell Biology, University of California, Berkeley, California 94720, and Department of Anesthesia and Pharmaceutical Chemistry, San Francisco General Hospital 94110, USA.
Researchers developed a novel antibody to detect sulfotyrosine, a crucial post-translational modification, independent of its surrounding protein sequence. This breakthrough demonstrates the potential of phage antibody libraries for creating specific reagents for studying cellular modifications.
Area of Science:
- Biochemistry
- Molecular Biology
- Immunology
Background:
- Post-translational modifications regulate cellular activities but are challenging to study due to a lack of specific reagents.
- Developing reagents that recognize modifications independently of sequence context is particularly difficult.
Purpose of the Study:
- To investigate the feasibility of using phage antibody libraries to isolate antibodies against post-translational modifications.
- To use sulfotyrosine as a model to develop sequence-independent antibodies.
Main Methods:
- Screening of a large phage antibody library (nearly 8000 clones).
- Utilized two selection strategies, including elution with tyrosine sulfate.
- Tested antibody specificity using peptides and natural proteins, and confirmed with sulfatase treatment and soluble tyrosine sulfate preincubation.
Main Results:
- Isolated a single specific single-chain variable fragment (Fv) antibody recognizing sulfotyrosine.
- The antibody demonstrated sequence-independent recognition of sulfotyrosine in various contexts.
- Specificity was confirmed by loss of reactivity upon antigen treatment with sulfatase or soluble tyrosine sulfate.
Conclusions:
- Phage antibody libraries show potential for generating reagents specific for post-translational modifications.
- The isolation of sequence-independent antibodies is possible but requires extensive screening.
- This approach offers a promising avenue for developing tools to study complex cellular signaling pathways.
