Abstract
In the variant rabbit strain BASILEA, immunoglobulin G were shown to contain two distinct populations of IgG molecules whose light (L) chains belonged to the known lambda isotype and to a new kappa-like type. These two L chains differed from each other by electrophoretic, chemical, and antigenic properties. The kappa-like L chain fraction showed (i) an acid-labile Asp-Pro bond at the end of the joining region and (ii) a tryptic peptide, whose amino acid sequence of the NH2-terminal 15 residues was identical to the homologous constant (C) region sequence of b9 kappa chain with the exception of the residue in position 70, which is asparagine in the kappa-like chain instead of the characteristic half-cystine residue in all L chains of kappa B type expressing b4, b5, b6, or b9 allotypes. The data suggest that the kappa-like L chain component does not contain the C region half-cystine residue involved in the formation of the extra variable (V) region-C region disulfide bridge in L chains of the kappa B [Rejnek, J., Appella, E., Mage, R. G. & Reisfeld, R. A. (1969) Biochemistry 8, 2712-2718]. The partial NH2-terminal amino acid sequence of the C region of the kappa-like L chain was shown to be markedly different from b4, b6, or b9 region sequences and from rabbit lambda C region sequence. Taken together, the chemical data suggest that the kappa bas component represents a new subtype of kappa chain. A rabbit alloantiserum made against bas IgG and adsorbed with IgG fractions showing b4, b5, b6, b95, and b96 L chain allotypes appeared to be directed against the kappa-like L chain component of BASILEA IgG exclusively. All BASILEA animals expressed IgG molecules containing kappa-like chains; in contrast, IgG molecules derived from the standard domestic rabbit did not react with this antiserum.
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