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. Author manuscript; available in PMC: 2010 Oct 21.
Published in final edited form as: J Phys Chem B. 2008 Aug 20;112(37):11762–11769. doi: 10.1021/jp801110q

Figure 1.

Figure 1

Examples of conformations adopted by AP (shown here for poly-glutamic acid). (1) α-helix: a right-handed helix with (Φ, Ψ) = (-58°, -47°), and an i − i+4 hydrogen bonding pattern; (2) poly-proline II-like (PPII): a left-handed helix with (Φ, Ψ) = (-75°, +145°) which hydrogen bonds to water and does not undergo intramolecular hydrogen bonding.