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Suppressor murine IgG-BF produced by the T cell hybrid (T2D4) expressing low affinity Fc gamma R (Fc gamma RII) contain four biologically active polypeptides of pI 5.2, 6.3, 7.7 and 8.3, respectively. They were fractionated by affinity chromatography on immunoadsorbents coupled with F(ab')2 fragments of the monoclonal anti-Fc gamma RII antibody 2.4G2 and by hydrophobic interaction chromatography. Both methods led to the identification of biologically active IgG-BF which react with 2.4G2 and of IgG-BF which do not react with 2.4G2. Molecules bearing the epitope recognized by 2.4G2 had an apparent pI of 5.3 while the pI of those which did not express this epitope were 6.3, 7.8 and 8.5, respectively. Therefore, one IgG-BF polypeptide of pI 5.3 is probably related to Fc gamma RII.
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