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Related Experiment Videos

Phages Displaying Peptides with beta Turn Conformation.

Jia-Da Li1, Wei-Gang Tang, Ke-Yi Wang

  • 1Institute of Biochemistry and Cell Biology, Shanghai Institutes for Biological Sciences, the Chinese Academy of Sciences, Shanghai 200031, China. kyw0717@sunm.shcnc.ac.cn

Sheng Wu Hua Xue Yu Sheng Wu Wu Li Xue Bao Acta Biochimica Et Biophysica Sinica
|June 7, 2002
PubMed
Summary

Phage display technology was used to create a peptide library targeting a specific antibody. Researchers successfully enriched and identified phage clones that specifically bind to the antibody's antigen-binding site, confirming conformational dependence.

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Area of Science:

  • Molecular Biology
  • Immunology
  • Biotechnology

Background:

  • Peptide libraries are crucial for identifying molecules that interact with biological targets.
  • Phage display is a powerful technique for generating and screening large peptide libraries.
  • Beta turn conformations are important structural motifs in peptide-protein interactions.

Purpose of the Study:

  • To construct and screen a phage display library of peptides designed to adopt a beta turn conformation.
  • To identify specific peptide sequences that bind to a monoclonal antibody (12CA5).
  • To validate the binding specificity and conformational dependence of the selected peptides.

Main Methods:

  • Construction of a filamentous phage display library by fusing a peptide sequence (CX(2)GPX(4)C) to the N-terminus of the g3p minor coat protein.

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  • Screening of the library using three rounds of enrichment with monoclonal antibody 12CA5.
  • Characterization of selected phage clones using phage ELISA, competitive ELISA, and conformational disruption assays.

    • Main Results:

    • A phage library with a diversity of 1.04x10^8 was successfully generated.
    • After three rounds of screening, significant enrichment of specific phage clones was observed.
    • Phage clones from the third round showed specific binding to the antigen-binding site of antibody 12CA5, which was dependent on peptide conformation.

    Conclusions:

    • Phage display is effective for selecting conformationally constrained peptides that bind specific antibodies.
    • The selected peptides specifically interact with the antigen-binding site of monoclonal antibody 12CA5.
    • The binding is conformation-dependent, highlighting the importance of the beta turn structure.