Abstract

Abstract The complete amino acid sequence of a type L Bence-Jones protein (an immunoglobulin λ light chain) has been determined, including the location of the disulfide bridges. λ light chains, like k light chains, are subject to extensive variation in primary structure in the NH2-terminal half, but the COOH-terminal portion appears to be invariant. When aligned to achieve maximum homology, about 40% of the amino acid residues are identical in the sequence of human k and λ chains. Genetic conservation of the main polypeptide chain conformation is reflected in the similar location of the disulfide bridges of k and λ chains and in the similarity in sequence around the half-cystine residues and throughout the entire molecule.

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