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Mismatch Repair01:20

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Organisms are capable of detecting and fixing nucleotide mismatches that occur during DNA replication. This sophisticated process requires identifying the new strand and replacing the erroneous bases with correct nucleotides. Mismatch repair is coordinated by many proteins in both prokaryotes and eukaryotes.
The Mutator Protein Family Plays a Key Role in DNA Mismatch Repair
The human genome has more than 3 billion base pairs of DNA per cell. Prior to cell division, that vast amount of genetic...
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Related Experiment Video

Updated: Oct 9, 2025

Procedure for Adaptive Laboratory Evolution of Microorganisms Using a Chemostat
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EASINESS: E. coli Assisted Speedy affINity-maturation Evolution SyStem.

Hai-Nan Zhang1, Jun-Biao Xue1, Aru Ze-Ling Wang2

  • 1Shanghai Center for Systems Biomedicine, Key Laboratory of Systems Biomedicine (Ministry of Education), Shanghai Jiao Tong University, Shanghai, China.

Frontiers in Immunology
|December 20, 2021
PubMed
Summary
This summary is machine-generated.

We developed EASINESS, a novel system for rapid antibody affinity maturation. This method significantly improved a therapeutic antibody

Keywords:
18A4Huantibody affinity improvementdirected evolutionerror-prone DNA polymerase Iprotein-fragment complementation assay

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Area of Science:

  • Biotechnology and Molecular Biology
  • Immunology and Antibody Engineering

Background:

  • Antibodies are crucial biomolecules in clinical research and therapeutics.
  • Antibody affinity is critical for biological activity and therapeutic efficacy.
  • Improving antibody affinity remains a significant challenge in antibody engineering.

Purpose of the Study:

  • To develop a novel system for continuous directed evolution of antibody-antigen interactions.
  • To enhance the affinity of therapeutic antibodies efficiently and rapidly.

Main Methods:

  • Development of the *E. coli* Assisted Speed affINity-maturation Evolution SyStem (EASINESS).
  • Utilized a modified error-prone DNA polymerase I (Pol I) mutation system for plasmid mutation.
  • Employed a split mDHFR protein-protein interaction selection system for affinity screening.
  • Verified system feasibility using a GCN4 variant and demonstrated its application on antibody 18A4Hu.

Main Results:

  • The EASINESS system achieved a 12-fold affinity improvement for antibody 18A4Hu against its target ARG2 within 7 days.
  • The process required minimal hands-on time, demonstrating high efficiency.
  • Improved antibody variants showed significant efficacy in inhibiting melanoma pulmonary metastasis in a mouse model.

Conclusions:

  • EASINESS provides an effective and rapid platform for antibody affinity maturation.
  • The system holds promise for developing enhanced therapeutic antibodies.
  • The improved antibody variants demonstrate potential for cancer therapy applications.