Primary structure of the variable region of an amyloidogenic Bence Jones protein NIG-77

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Abstract

The complete amino acid sequence of the variable region of a Bence Jones protein NIG-77 from an individual with myeloma-associated systemic amyloidosis has been determined. This protein represents a complete light chain consisting of 216 residues and it has a sequence characteristic of V λ I subgroup, which is closely homologous to that of another amyloidogenic V λ I Bence Jones protein NIG-51, differing by 20 of 111 residues (82% homology). In contrast, it differs by 29 residues (74% homology) to that of non-amyloidogenic Vλ I light chain NIG-64. This finding shows that, in accordance with our previous report (1), the Vλ I-related light chains can further be divided into two distinct subsubgroups, Vλ I-1 and Vλ I-2, and the latter property seems to be more prone in association with the amyloid process.

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