title: Cyanogen bromide splitting of human immunoglobulin M.
abstract: Human Waldenstrdm IgM (kappa) (Dau), its polypeptide chains and its F(c)5 micro and Fab micro fragments were split by cyanogen bromide (CNBr). The fragments formed by CNBr were fractionated by gel filtration, ion exchange chromatography and paper electrophoresis. They were characterized in terms of polyacrylamide disc electrophoresis, peptide maps, amino acid composition, end group determinations and limited primary structure determination. Two CNBr fragments were formed from the kappa chain, consistent with the presence of one methionine residue. Five fragments were isolated from the partially S-sulfonated micro chain. Three additional fragments were released after destruction of all disulfide bonds. The present data are unclear as to whether there are eight or nine CNBr fragments released. The comparison of CNBr pieces from the IgM, mu chain, F(c)5mu and Fab mu affords a tentative arrangement of their order, as well as the relative location of the disulfide bonds within the molecule.
authors.affiliation: Division of Clinical Immunology and Rheumatology, Department of Medicine, University of Alabama in Birmingham, University Station, Birmingham, Ala. 35294 USA.
authors.forename: J
authors.initials: J
authors.lastname: Zikán
authors.forename: J C
authors.initials: JC
authors.lastname: Bennett
mesh_terms: D000596:Amino Acids / Q000737:chemistry; D002845:Chromatography / Q000379:methods; D002850:Chromatography, Gel / Q000379:methods; D002852:Chromatography, Ion Exchange / Q000379:methods; D003488:Cyanogen Bromide / Q000494:pharmacology*; D004220:Disulfides / Q000737:chemistry; D004591:Electrophoresis, Polyacrylamide Gel; D006801:Humans; D007122:Immunoelectrophoresis; D007140:Immunoglobulin Fab Fragments / Q000302:isolation & purification; D007075:Immunoglobulin M / Q000737:chemistry / Q000378:metabolism*; D010100:Oxygen / Q000737:chemistry; D010455:Peptides / Q000737:chemistry
chemical_list: D000596:Amino Acids; D004220:Disulfides; D007140:Immunoglobulin Fab Fragments; D007075:Immunoglobulin M; D010455:Peptides; D003488:Cyanogen Bromide; D010100:Oxygen