Biochemical Journal 1986-Nov
Structural studies of a carbohydrate-containing immunoglobulin-lambda-light-chain amyloid-fibril protein (AL) of variable subgroup III.
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The amino acid sequence of the variable region of a carbohydrate-containing amyloid-fibril protein MOL of immunoglobulin-light-chain type (AL) was elucidated. The sequence determination involved cleaving the protein with CNBr, BNPS-skatole, thermolysin and trypsin. The sequenced protein consisted of about 130 amino acid residues; however, gel-filtration and N-terminal analysis studies revealed AL proteins ranging in Mr from about 10,000 to 25,000. The oligosaccharide chain was found to be bound in the hypervariable region. By sequence homology to other lambda chains the AL protein MOL was shown to be of the V lambda III subgroup.