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Cyanogen bromide splitting of human immunoglobulin M

J Zikán1, J C Bennett

  • 1Division of Clinical Immunology and Rheumatology, Department of Medicine, University of Alabama in Birmingham, University Station, Birmingham, Ala. 35294 USA.

Biochimica Et Biophysica Acta
|December 17, 2009
PubMed

Insights

Researchers fragmented human Waldenstrom

Area of Science:

  • Immunology
  • Biochemistry

Background:

  • Waldenstrom macroglobulinemia is a B-cell lymphoproliferative disorder characterized by the overproduction of IgM paraproteins.
  • Understanding the structure of IgM is crucial for developing targeted therapies.

Purpose of the Study:

  • To elucidate the primary structure of human Waldenstrom IgM (kappa) (Dau).
  • To map the cyanogen bromide (CNBr) fragments of IgM, its mu chain, and its F(c)5mu and Fab micro fragments.

Main Methods:

  • Cyanogen bromide (CNBr) cleavage of IgM and its fragments.
  • Fractionation using gel filtration, ion exchange chromatography, and paper electrophoresis.
  • Characterization via polyacrylamide disc electrophoresis, peptide mapping, amino acid composition, and primary structure determination.

Main Results:

  • Two CNBr fragments were generated from the kappa chain, indicating one methionine residue.
  • Five fragments were isolated from the S-sulfonated mu chain.
  • The total number of CNBr fragments was determined to be eight or nine.
  • A tentative arrangement of fragment order and disulfide bond locations was proposed.

Conclusions:

  • The study provides insights into the primary structure of human Waldenstrom IgM.
  • The fragmentation and characterization of CNBr pieces offer a framework for understanding IgM molecular architecture and disulfide bond organization.

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