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Related Experiment Videos

Variant antibody identification by peptide mapping

M Wan1, F Y Shiau, W Gordon

  • 1Tanox Biosystems, Inc., Houston, Texas 77025, USA.

Biotechnology and Bioengineering
|January 28, 1999
PubMed
Summary
This summary is machine-generated.

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A variant heavy chain in monoclonal antibody CGP56901 was identified due to a gene crossover event. Peptide mapping proved effective for characterizing this monoclonal antibody quality.

Area of Science:

  • Biochemistry
  • Immunology
  • Protein Chemistry

Background:

  • Monoclonal antibodies (MAbs) are crucial biotherapeutics.
  • Ensuring MAb quality, including heavy chain integrity, is essential for efficacy.
  • CGP56901 is a MAb targeting a unique epitope on human IgE.

Purpose of the Study:

  • To investigate an observed minor heavy chain (H-chain) variant in CGP56901.
  • To characterize the nature and origin of the H-chain variant.
  • To evaluate the utility of peptide mapping in MAb quality control.

Main Methods:

  • Sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) to detect H-chain variants.
  • N-terminal amino acid sequencing to analyze the variant's composition.
  • Peptide mapping and amino acid sequencing to confirm gene crossover events.

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Main Results:

  • A minor H-chain variant with a lower molecular weight was detected.
  • N-terminal sequencing revealed identity with the antibody light-chain (L-chain) variable domain.
  • Peptide mapping confirmed a gene crossover between V genes, resulting in a truncated H-chain.

Conclusions:

  • A gene crossover event between antibody V genes can lead to variant H-chains.
  • Peptide mapping is a valuable initial method for characterizing MAb quality and identifying such variants.
  • Understanding these variants is critical for ensuring the consistent quality of therapeutic MAbs.