title: Affinity labeling of the heavy and light chains of a myeloma protein with anti-2,4-dinitrophenyl activity.
abstract: A mouse myeloma protein with high affinity for 2,4-dinitrophenyl (Dnp) ligands was reacted with the bromoacetyl derivatives of N-Dnp-ethylenediamine and (epsilon)-N-Dnp-L-lysine. Up to 1.4 sites per protein molecule were covalently labeled. The labeling reactions were essentially completely blocked by a large excess of Dnp ligands that do not combine covalently (e.g., (epsilon)-Dnp-L-lysine). Analyses of the labeled protein revealed that the bromoacetyl derivative of N-Dnp-ethylenediamine reacted exclusively with tyrosyl in the light chain, while the derivative of (epsilon)-Dnp-L-lysine reacted exclusively with lysyl in the heavy chain. The findings support the conclusion that chains are involved in forming specific combining sites.
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001345:Autoradiography; D001665:Binding Sites; D002247:Carbon Isotopes; D004140:Dinitrophenols; D004586:Electrophoresis; D000939:Epitopes; D005029:Ethylenediamines; D007136:Immunoglobulins / Q000032:analysis; D008239:Lysine; D051379:Mice; D010455:Peptides; D010954:Plasmacytoma / Q000378:metabolism*; D014443:Tyrosine; D005719:gamma-Globulins
chemical_list: D002247:Carbon Isotopes; D004140:Dinitrophenols; D000939:Epitopes; D005029:Ethylenediamines; D007136:Immunoglobulins; D010455:Peptides; D005719:gamma-Globulins; D014443:Tyrosine; D008239:Lysine