More pronounced twisting and divergence of the strands is seen for peptides containing type I′ turn nucleated β-hairpins. Superposition of the structure of the synthetic octapeptide Boc-Leu-Phe-Val-Aib-D-Ala-Leu-Phe-Val-OMe (black) with that of a peptide with the same strand residues but a type II′ turn nucleated β-hairpin (gray) illustrates the flattened nature of the latter. Aib=aminoisobutyric, Boc=tert-butoxycarbonyl.
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Aravinda et al. (2002) studied this question.