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Tailoring in vitro evolution for protein affinity or stability.

L Jermutus1, A Honegger, F Schwesinger

  • 1Biochemisches Institut, Universität Zürich, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland.

Proceedings of the National Academy of Sciences of the United States of America
|January 3, 2001
PubMed
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This study presents a rapid in vitro technology to enhance protein affinity or stability. Using ribosome display and DNA shuffling, researchers improved antibody fragments, demonstrating predictable protein evolution.

Area of Science:

  • Biotechnology
  • Protein Engineering
  • Molecular Biology

Background:

  • Ligand-binding proteins like antibody fragments are crucial in diagnostics and therapeutics.
  • Existing methods for protein evolution can be time-consuming and limited in scope.
  • Optimizing protein affinity and stability is key for developing effective biologics.

Purpose of the Study:

  • To develop a rapid and versatile in vitro technology for evolving protein affinity or stability.
  • To demonstrate the efficacy of this technology using single-chain Fv antibody fragments (scFvs).
  • To explore distinct selection strategies for optimizing off-rate and thermodynamic stability.

Main Methods:

  • Combined ribosome display with in vitro DNA shuffling for protein diversification.

Related Experiment Videos

  • Employed off-rate selection to enhance binding affinity of scFvs.
  • Utilized altered redox conditions during ribosome display selection to evolve protein stability.

    • Main Results:

    • Achieved a 30-fold improvement in scFv affinity using off-rate selections.
    • Increased the thermodynamic stability of scFvs by over 2-fold (from 24 to 54 kJ/mol) by selecting for stability under reducing conditions.
    • Identified diverse residue mutation strategies employed by evolved proteins to adapt to selection pressures.

    Conclusions:

    • The described in vitro technology enables rapid and predictable evolution of protein properties.
    • This method offers a powerful platform for engineering proteins with enhanced affinity or stability.
    • The findings pave the way for designing improved protein-based therapeutics and diagnostics.