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Unformatted text preview: atom attached to the nitrogen of one peptide linkage to the oxygen of the carbonyl group of the 4th amino acid behind it. -- max binding and stability. Energetically most feasible form. Each peptide bond in chain participates in hydrogen bonding. . chain is thus maximally hydrogen bonded.-correlates with alpha keratin-- known as fibrous proteins-- component of hair and nails. peptide chains are expected to form alpha helixes spontaneously because it form is the most stable and has the least free energy. exception: if proline is present it interrupts the alpha helix to create a bend. .. since its too rigid. an alpha helix cannot form if there are opposing interactions of the R groups or solvent. ex. polylysine cannot form an alpha helix at ph 7 because of its R group have a positive charge....
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- Fall '08