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Updated: Oct 21, 2026

Antibody Binding Specificity for Kappa (Vκ) Light Chain-containing Human (IgM) Antibodies: Polysialic Acid (PSA) Attached to NCAM as a Case Study
Published on: June 29, 2016
The amino-acid sequence of the variable region of a carbohydrate-containing amyloid fibril protein EPS
Abstract:
The amino-acid sequence of the variable region of a carbohydrate-containing amyloid fibril protein EPS of immunoglobulin lambda light chain origin has been elucidated. The protein was isolated from the liver of a patient (EPS) with an immunocyte dyscrasia of the IgM type. The molecular mass of this protein was found to be about 20 kDa including an oligosaccharide chain linked to it. The amino-acid sequence determination involved automatic Edman degradation of polypeptides obtained after cleaving the protein with BNPS-skatole, trypsin and thermolysin. The proposed sequence of the variable region of the protein showed that it may be assigned to the V lambda I subgroup. A tryptic and a thermolysinolytic peptide both containing the carbohydrate were isolated and characterized, and the localization of an oligosaccharide chain linked to asparagine was established.
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