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Related Experiment Videos

Amino acid substitutions determining G3m(g5).

S Ito1, K Suzuki, T Miyazaki

  • 1Department of Legal Medicine, Osaka Medical School, Japan.

Experimental and Clinical Immunogenetics
|January 1, 1990
PubMed
Summary

Amino acid substitutions at positions 435 and 436 determine the G3m(g5) allotypic marker specificity in immunoglobulin G3 (IgG3). Tyrosine at position 436, interacting with phenylalanine 124, is crucial for protein A binding.

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Area of Science:

  • Immunogenetics
  • Protein Chemistry

Background:

  • Immunoglobulin G3 (IgG3) allotypic markers are crucial for immune response.
  • Understanding the molecular basis of these markers aids in characterizing IgG3 variations.

Purpose of the Study:

  • To identify specific amino acid substitutions responsible for the G3m(g5) allotypic marker.
  • To elucidate the role of these substitutions in protein A interactions.

Main Methods:

  • Sequence analysis of C-terminal BrCN peptides from myeloma proteins Ba and Bu.
  • Affinity chromatography of modified IgG3 proteins using Protein A-Sepharose.

Main Results:

  • Arginine and tyrosine at positions 435 and 436, respectively, were identified as specific for the G3m(g5) marker.

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  • Tyrosine at position 436, in conjunction with phenylalanine at position 124, influences protein A binding.
  • Observed variations in Protein A-Sepharose affinity chromatography yields are explained by residue configuration and tertiary structure.

    • Conclusions:

    • Specific amino acid residues at positions 435 and 436 dictate G3m(g5) allotypic specificity.
    • The interaction between tyrosine 436 and phenylalanine 124 is vital for IgG3-protein A binding, impacting chromatographic behavior.