Polymorphism of β2-microglobulin amyloid fibrils manifested by ultrasonication-enhanced fibril formation in trifluoroethanol.

The Journal of Biological Chemistry
Eri ChataniYuji Goto

Abstract

The polymorphic property of amyloid structures has been focused on as a molecular basis of the presence and propagation of different phenotypes of amyloid diseases, although little is known about the molecular mechanism for expressing diverse structures from only one protein sequence. Here, we have found that, in combination with an enhancing effect of ultrasonication on nucleation, β(2)-microglobulin, a protein responsible for dialysis-related amyloidosis, generates distinct fibril conformations in a concentration-dependent manner in the presence of 2,2,2-trifluoroethanol (TFE). Although the newly formed fibrils all exhibited a similar needle-like morphology with an extensive cross-β core, as suggested by Fourier transform infrared absorption spectra, they differed in thioflavin T intensity, extension kinetics, and tryptophan fluorescence spectra even in the same solvents, representing polymorphic structures. The hydrophobic residues seemed to be more exposed in the fibrils originating at higher concentrations of TFE, as indicated by the increased binding of 1-anilinonaphthalene-8-sulfonic acid, suggesting that the modulation of hydrophobic interactions is critical to the production of polymorphic amyloid structures. Interesti...Continue Reading

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