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Bacterial Peptide Display for the Selection of Novel Biotinylating Enzymes
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Profiling tyrosine kinase substrate recognition using bacterial peptide display and deep sequencing.

Minhee Lee1, Neel H Shah1

  • 1Columbia University, Department of Chemistry, New York, NY 10027.

Biorxiv : the Preprint Server for Biology
|January 9, 2026
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Summary

This study presents a novel bacterial display method for rapidly measuring tyrosine kinase substrate preferences. The approach uses deep sequencing to analyze thousands of peptides, revealing distinct sequence recognition patterns for different tyrosine kinases.

Keywords:
Kinasesbacterial displaydeep sequencingsubstrate recognition

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cell Signaling

Background:

  • Tyrosine kinases are crucial regulators of cell signaling pathways.
  • Dysregulation of tyrosine kinases is implicated in various diseases, particularly cancers.
  • Understanding tyrosine kinase substrate specificity is essential for deciphering their biological roles.

Purpose of the Study:

  • To develop and validate a high-throughput method for profiling tyrosine kinase substrate sequence preferences.
  • To enable rapid measurement of phosphorylation efficiencies for numerous peptides simultaneously.
  • To investigate the utility of bacterial peptide display and deep sequencing for studying enzyme recognition.

Main Methods:

  • Utilized bacterial peptide display to generate genetically-encoded peptide libraries.
  • Employed deep sequencing to analyze the relative phosphorylation efficiencies of thousands of peptides.
  • Validated the method by comparing results with enzyme kinetics and known substrate preferences.
  • Explored compatibility with genetic code expansion for non-canonical amino acids.

Main Results:

  • The developed method allows for rapid, simultaneous measurement of phosphorylation efficiencies.
  • Results strongly correlate with quantitative enzyme kinetic measurements.
  • The assay successfully corroborates established tyrosine kinase substrate preferences.
  • New insights into tyrosine kinase substrate specificity were uncovered.

Conclusions:

  • Bacterial peptide display combined with deep sequencing offers a powerful and versatile tool for studying tyrosine kinase substrate specificity.
  • This method facilitates the efficient construction and screening of tailored peptide libraries.
  • The approach provides a cost-effective means to gain deeper understanding of kinase-substrate interactions and disease mechanisms.