Abstract
We report coupled cluster, MP2 and DFT data on the relative energy and geometry of α-sheet and β-strand conformations of model peptides. We show that ionic effects have a strong effect on energy balance through formation of multiple cation-oxygen contacts in the α-sheet form. Such effects are markedly dependent on both sequence and ion: two peptides considered favour α-sheet in the presence of cations, whereas a third, non-polar one favours β-strand in the same conditions.
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