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. 1985 Apr;75(4):1138–1143. doi: 10.1172/JCI111808

Homology of the NH2-terminal amino acid sequences of the heavy and light chains of human monoclonal lupus autoantibodies containing the dominant 16/6 idiotype.

P M Atkinson, G W Lampman, B C Furie, Y Naparstek, R S Schwartz, B D Stollar, B Furie
PMCID: PMC425437  PMID: 3921567

Abstract

The NH2-terminal amino acid sequences have been determined by automated Edman degradation for the heavy and light chains of five monoclonal IgM anti-DNA autoantibodies that were produced by human-human hybridomas derived from lymphocytes of two patients with systemic lupus erythematosus. Four of the antibodies were closely related to the idiotype system 16/6, whereas the fifth antibody was unrelated idiotypically. The light chains of the 16/6 idiotype-positive autoantibodies (HF2-1/13b, HF2-1/17, HF2-18/2, and HF3-16/6) had identical amino acid sequences from residues 1 to 40. Their framework structures were characteristic of VKI light chains. The light chain of the 16/6 idiotype-negative autoantibody HF6-21/28 was characteristic of the VKII subgroup. The heavy chains of the 16/6 idiotype-positive autoantibodies had nearly identical amino acid sequences from residues 1 to 40. The framework structures were characteristic of the VHIII subgroup. In contrast, the GM4672 fusion partner of the hybridoma produced small quantities of an IgG with a VHI heavy chain and a VKI light chain. The heavy chains of the lupus autoantibodies and the light chains of those autoantibodies that were idiotypically related to the 16/6 system had marked sequence homology with WEA, a Waldenstrom IgM that binds to Klebsiella polysaccharides and expresses the 16/6 idiotype. These results indicate a striking homology in the amino termini of the heavy and light chains of the lupus autoantibodies studied and suggest that the V regions of the heavy and light chains of the 16/6 idiotype-positive DNA-binding lupus auto-antibodies are each encoded by a single germ line gene.

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Selected References

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