title: V kappa and J kappa gene segments of A/J Ars-A antibodies: somatic recombination generates the essential arginine at the junction of the variable and joining regions.
abstract: The germ-line elements for the variable (V) and joining (J) regions of the kappa chains (V kappa-Ars, J kappa 1) that give rise to the productive allele for the A/J mouse light chains of Ars-A monoclonal antibodies (directed against the hapten p-azophenylarsonate) have been cloned and sequenced as well as a rearranged Ars-A light chain gene. Using the V kappa-Ars gene as a hybridization probe, we provide evidence that the V kappa 10 family is relatively small and that only one member gives rise to the productive allele in all Ars-A antibodies. An unusual feature of Ars-A light chains is that all contain an arginine at position 96, the V-J junctional position. We had shown by chain recombination that arginine-96 was essential for antigen binding. In the present study, an arginine codon was not found either at the 3' end of the V kappa-Ars gene segment or at the 5' end of J kappa 1. However, an arginine codon (CGG) can easily be generated by recombination between these two germ-line elements. Thus, we document that junctional diversity through intracodonic recombination can be crucial to the antibody binding function of the resulting molecule.
mesh_terms: D000483:Alleles; D000818:Animals; D000911:Antibodies, Monoclonal / Q000235:genetics*; D001120:Arginine / Q000235:genetics*; D003001:Cloning, Molecular; D004247:DNA; D005796:Genes; D006825:Hybridomas / Q000502:physiology; D007135:Immunoglobulin Variable Region; D007145:Immunoglobulin kappa-Chains / Q000235:genetics*; D051379:Mice; D008815:Mice, Inbred Strains; D009693:Nucleic Acid Hybridization; D011995:Recombination, Genetic
chemical_list: D000911:Antibodies, Monoclonal; D007135:Immunoglobulin Variable Region; D007145:Immunoglobulin kappa-Chains; D004247:DNA; D001120:Arginine