79 Cross-beta structure of an amyloid-forming peptide ... - CiteSeerX

1 downloads 2 Views 656KB Size Report
The sharp 4.86Ε layer-line spacing (with no trace of a 9.72Ε spacing) ... Bragg reflections determined from the electron diffraction data indicate that the ...

Cross-beta structure of an amyloid-forming peptide studied by electron nano-crystallography Ruben Diaz-Avalos*, Chris Long, Eric Fontano, Melinda Balbirnie, Robert Grothe, David Eisenberg and Donald L.D. Caspar Institute of Molecular Biophysics, Florida State University, Tallahassee, Fl 32306. *Corresponding Author: Ruben Diaz-Avalos, Fibre Diffraction Review 11, 79-86, 2003

ABSTRACT The seven residue peptide GNNQQNY from the N-terminal region of the yeast prion protein Sup35, which forms both amyloid fibres and highly ordered microcrystals, provides a model system for characterizing the structure and stability of the elusive cross-beta amyloid conformation. Microcrystals of this peptide, which have largest dimension ~1µm in the cross-beta fibre axis direction, diffract electrons to ultra high resolution (