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Semisynthetic Phage Display Library Construction: Generation of Single-Chain Variable Fragment Secondary Libraries.

Juan C Almagro1, Mary Ann Pohl2

  • 1GlobalBio, Inc., Cambridge, Massachusetts 02138, USA juan.c.almagro@globalbioinc.com.

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|October 16, 2024
PubMed
Summary

This study details the final step in creating therapeutic antibody discovery libraries using phage display. The method enhances antibody diversity by incorporating natural heavy chain CDR3 regions into semisynthetic libraries for robust antibody discovery.

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Area of Science:

  • Biotechnology
  • Immunology
  • Molecular Biology

Background:

  • Phage display is a key technique for identifying antibodies.
  • Antibody fragments displayed on M13 bacteriophages aid in target binding discovery.
  • Previous steps involved primary and filtered library construction.

Purpose of the Study:

  • To describe the third and final step in constructing Antibody Libraries for Therapeutic Antibody Discovery (ALTHEA) Libraries.
  • To enhance antibody diversity in the final library construction phase.
  • To establish a robust platform for therapeutic antibody discovery.

Main Methods:

  • Nucleotide sequences for single-chain variable fragments (scFvs) from filtered libraries (FLs) were amplified via PCR.
  • Natural heavy chain CDR3 (HCDR3) and joining (H3J) fragments were obtained from a diverse donor pool.
  • PCR-amplified scFvs were combined with natural H3J fragments, replacing neutral H3J fragments in FLs to create semisynthetic secondary libraries (SLs).
  • Library quality was assessed by random clone sequencing.

Main Results:

  • Successfully generated semisynthetic secondary libraries (SLs) with maximized diversity.
  • Incorporated natural H3J fragments, capturing over 95% of the natural H3J repertoire.
  • Validated library quality through sequencing of randomly selected clones.

Conclusions:

  • The described method represents the final step in the ALTHEA library construction.
  • The resulting semisynthetic secondary libraries are robust and ready for phage selection.
  • This approach provides a powerful platform for therapeutic antibody discovery.