Amyloidosis pp 463-475 | Cite as

Structural Studies of the Variable Region of Immunoglobulin Light-Chain-Type Amyloid Fibril Proteins

  • Knut Sletten
  • Per Westermark
  • Gunnar Husby

Abstract

AL proteins, six of the k-type and ten of the λ-type, were isolated from amyloid fibrils obtained from amyloid-laden organs of patients with plasma cell dyscrasias. The AL proteins were subgroups in VkI, VkIII, VλI, VλII, VλIII, VλIV and VλVI. The molecular weight ranged from 12 to 22 kD. At least 4 of the k-type and 5 of the λ-type AL proteins contained carbohydrate. Elucidation of the primary structure of three AL-chains sub-grouped in VλI, VλII and VλIII, revealed several positions where some unique amino acid interchanges had occurred. A comparison of AL-chains and Bence Jones proteins from patients without amyloidosis, indicated that the homology between two AL-chains of the same subgroup was less than that between an AL-chain and a Bence Jones protein. Location of oligosaccharide chains were established by amino acid sequence analyses of glycopeptides. The glycosylation sites were located in the CDR 1, CDR 3 and the FR 4.

Keywords

High Performance Liquid Chromatography Urea Polypeptide Trypsin Methionine 

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Copyright information

© Plenum Press, New York 1986

Authors and Affiliations

  • Knut Sletten
    • 1
  • Per Westermark
    • 2
  • Gunnar Husby
    • 3
  1. 1.Department of BiochemistryUniversity of OsloOsloNorway
  2. 2.Institute of PathologyUniversity of UppsalaUppsalaSweden
  3. 3.Department of RheumatologyThe University Hospital of TromsøNorway

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