title: Purification and characterization of a protein that binds to the recombination signal sequence of the immunoglobulin J kappa segment.
abstract: A protein that binds to the recombination signal sequence (RS) of the immunoglobulin J kappa segment was purified almost to homogeneity from the nuclear extract of a murine pre-B cell line 38B9. A similar binding protein was found in lymphoid cell lines but not in non-lymphoid cell lines. The binding activity was associated with a polypeptide with a molecular weight of 60,000. DNase I footprinting analysis demonstrated that this binding protein interacted with the heptamer and several 3' bases close to the heptamer. The Kd value of the J kappa RS binding protein to the J kappa RS was 1 nM. One base substitution in the heptamer of the J kappa RS greatly reduced the affinity of the J kappa RS binding protein. The high specificity of the binding site of the J kappa RS binding protein suggests that this protein may be involved in V-J recombination.
authors.affiliation: Department of Medical Chemistry, Kyoto University Faculty of Medicine, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Hamaguchi
authors.forename: N
authors.initials: N
authors.lastname: Matsunami
authors.forename: Y
authors.initials: Y
authors.lastname: Yamamoto
authors.forename: T
authors.initials: T
authors.lastname: Honjo
mesh_terms: D000818:Animals; D001402:B-Lymphocytes / Q000276:immunology; D001483:Base Sequence; D002460:Cell Line; D002467:Cell Nucleus / Q000378:metabolism; D002846:Chromatography, Affinity; D015342:DNA Probes; D004268:DNA-Binding Proteins / Q000302:isolation & purification / Q000378:metabolism*; D003850:Deoxyribonuclease I; D005803:Genes, Immunoglobulin; D007144:Immunoglobulin J-Chains / Q000235:genetics*; D007145:Immunoglobulin kappa-Chains / Q000235:genetics*; D007700:Kinetics; D051379:Mice; D008969:Molecular Sequence Data; D021382:Protein Sorting Signals / Q000235:genetics / Q000378:metabolism*; D011995:Recombination, Genetic
chemical_list: D015342:DNA Probes; D004268:DNA-Binding Proteins; D007144:Immunoglobulin J-Chains; D007145:Immunoglobulin kappa-Chains; D021382:Protein Sorting Signals; D003850:Deoxyribonuclease I