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Data are reported on the genetic control and structure of antigen-specific suppressive molecules obtained from azobenzenearsonate (ABA)-specific suppressor T cells (Ts). Ts-derived suppressor factors (TsFs) were previously shown to bear determinants encoded by genes of the I-J subregion of the H-3 major histocompatibility complex and structures encoded by VH (variable region of heavy chains) genes linked to the Igh locus. To further characterize TsF we have made use of a K light (L) chain variable region (VK) genetic marker linked to the locus governing expression of a crossreactive idiotype on anti-ABA antibodies. The experiments evaluated the possible contribution to TsF of structures under control of the VK locus. TsF was prepared in strains of mice with known Igh and VK genes. Mice carrying Igh-1e genes produced TsF that was retained by an immunoadsorbent containing bound anti-idiotype antibodies; the genetic constitution at the VK locus was not relevant. By using a panel of anti-idiotypic antibodies prepared against the antigen-binding site of antibody carrying the idiotype, against determinants outside the site or against VH structures, we determined that idiotypic structures on the TsF are associated with V-region elements associated with the H chain and not with the binding site formed by a VH-BL combination.

proceedings of the national academy of sciences of the united states of america

Genetic and serological analysis of the expression of crossreactive idiotypic determinants on anti-p-azobenzenarsonate antibodies and p-azobenzenarsonate-specific suppressor T cell factors.