Amyloid fibril formation from full-length and fragments of amylin

C. Goldsbury, K. Goldie, J. Pellaud, J. Seelig, P. Frey, S. A. Müller, J. Kistler, Garth Cooper, U. Aebi

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Amyloid deposits of fibrillar human amylin (hA) in the pancreas may be a causative factor in type-2 diabetes. A detailed comparison of in vitro fibril formation by full-length hA(1-37) versus fragments of this peptide - hA(8-37) and hA(20-29) - is presented. Circular dichroism spectroscopy revealed that fibril formation was accompanied by a conformational change: Random coil to β-sheet/α-helical structure. Fibril morphologies were visualized by electron microscopy and displayed a remarkable diversity. hA(20-29) formed flat ribbons consisting of numerous 3.6-nm-wide protofibrils. In contrast, hA(1-37) and hA(8-37) formed polymorphic higher order fibrils by lateral association and/or coiling together of 5.0-nm-wide protofibril subunits. For full-length hA(1-37), the predominant fibril type contained three protofibrils and for hA(8-37), the predominant type contained two protofibrils. Polymerization was also monitored with the thioflavin-T binding assay, which revealed different kinetics of assembly for hA(1-37) and hA(8-37) fibrils. hA(20-29) fibrils did not bind thioflavin-T. Together the results demonstrate that the N-terminal region of the hA peptide influences the relative frequencies of the various higher order fibril types and thereby the overall kinetics of fibril formation. Furthermore, while residues 20-29 contribute to the fibrils' β-sheet core, the flanking C- and N-terminal regions of the hA peptide determine the interactions involved in the formation of higher order coiled polymorphic superstructures. (C) 2000 Academic Press.
Original languageEnglish
Pages (from-to)352-362
Number of pages10
JournalJournal of Structural Biology
Issue number2-3
Publication statusPublished - 2000


  • Amylin
  • Amyloid
  • Circular dichroism spectroscopy
  • Diabetes mellitus
  • Fibril structure
  • IAPP
  • Polymorphism
  • Scanning transmission electron microscopy (STEM)
  • Transmission electron microscopy (TEM)


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