Collagen is characterised by a right-handed triple helix formed from three left-handed polyproline II helical chains. Each chain follows a Gly-X-Y repeating motif, in which glycine occupies the ...
Oligoprolines, short peptides made up only of the amino acid proline, form polyproline II (PPII) helices, the third-most-common peptide and protein secondary structure after α-helices and β-sheets.
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