Formation of amyloid oligomers by AChE_586-599 and AChE_586-599 mutants.

Oligomers of AChE_586-599 and AChE_586-599 mutants (12 µM) were cross-linked by photo-induced cross-linking. Cross-linked products were resolved (16.5% Tris-Tricine SDS-PAGE), electro-blotted onto nitrocellulose and probed with Mab 105A (specific for AChE_586-599 in β-sheet conformation). Marker proteins are indicated. Arrows indicate low abundance oligomeric species. Due to the strength of the signal for the oligomeric species, Y₉/A was loaded at a third of the amount of the other peptides (Y₉/A*). The signal resulting from loading equal amount to the other peptides can be seen on the individual lane on the right hand side of the top panel (Y₉/A). On the right hand side of the bottom panel, an overexposure of the signal for W₁₃/A shows multiple oligomeric species not seen at normal exposure.