Amyloidal protein fibrils occur in many biological events, but their formation and structural variability are understood rather poorly. We systematically explore fibril polymorphism for polyglutamic acid (PGA), insulin and hen egg white lysozyme. The fibrils were grown in the presence of "seeds", that is fibrils of the same or different protein. The seeds in concentrations higher than about 5 % of the total protein amount fully determined the structure of the final fibrils. Fibril structure was monitored by vibrational circular dichroism (VCD) spectroscopy and other techniques. The VCD shapes significantly differ for different fibril samples. Infrared (IR) and VCD spectra of PGA were also simulated using density functional theory (DFT) and a periodic model. The simulation provides excellent basis for data interpretation and reveals that the spectral shapes and signs depend both on fibril length and twist. The understanding of fibril formation and interactions may facilitate medical treatment of protein misfolding diseases in the future.

Faculty of Mathematics and Physics Charles University Ke Karlovu 3 12116 Prague 2 Czech Republic

Institute of Organic Chemistry and Biochemistry Academy of Sciences Flemingovo náměstí 2 16610 Prague Czech Republic

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