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We identify a distinctive circular dichroism (CD) signature for self-assembled 14-helical beta-peptides. Our data show that self-assembly leads to a mimimum at 205 nm, which is distinct from the well-known minimum at 214 nm for a monomeric 14-helix. The onset of assembly is indicated by [theta]205/[theta]214&gt;0.7. Our results will facilitate rapid screening for self-assembling beta-peptides and raise the possibility that far-UV CD will be useful for detecting higher-order structure for other well-folded oligoamide backbones.

Distinctive Circular Dichroism Signature for 14-Helix-Bundle Formation by β-Peptides