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- W2140602236 abstract "After 5 years of subcutaneous transfer in Balb/C mice, our MOPC 173 myeloma tumour line (originally an IgG2a,κ H 2 L 2 -producer) exclusively synthesized an unusual IgG2b,κ protein lacking inter-heavy (H) chain disulfide bonds. This protein was designated MOPC 173B. On sodium dodecyl sulfate – polyacrylamide gel electrophoresis, it migrated with an apparent molecular weight of 77 000; following complete reduction and alkylation, the mobilities of its constituent H and light (L) chains were found to differ slightly from those of MOPC 173 H 2 L 2 . MOPC 173B was serologically identical to another typical IgG2b,κ myeloma protein, MOPC 195, and peptide mapping studies showed that it possessed only the inter H–L disulfide bond characteristic of typical IgG2b,κ proteins. In a nondissociating solvent, the sedimentation coefficient of the protein was 6.3S even at concentrations as low as 0.2 mg/ml, indicating that noncovalent interactions existed between two half-molecule subunits. Since this unusual IgG myeloma protein contained only a single category of interchain disulfide bridge, the inter H–L bond, it was an ideal model system for characterization of the kinetics of formation and reduction of interchain disulfide bonds. The kinetics of the glutathione-catalyzed reoxidation of the inter H–L disulfide bridge in MOPC 173B followed an apparent second-order rate equation. In contrast, reduction of its inter H–L bridge under anaerobic conditions with dithioerythritol in excess, was strictly a first-order process and not a simple reversal of the reoxidation. These studies provide the basis for the more complex mathematical models that describe the reoxidation and reduction of typical immunoglobulin molecules." @default.
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- W2140602236 date "1979-03-01" @default.
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- W2140602236 title "The kinetics of in vitro reoxidation and reduction of the inter heavy–light chain disulfide bond in an unusual murine immunoglobulin G myeloma protein lacking inter-heavy chain disulfide bonds" @default.
- W2140602236 doi "https://doi.org/10.1139/o79-035" @default.
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