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X-Prolyl dipeptidyl aminopeptidase PepX, N-terminal This N-terminal domain adopts a secondary structure consisting of a helical bundle of eight alpha helices and three beta strands, with the last alpha helix connecting to the first strand of the catalytic domain. The first strand of the N-terminus also forms a small parallel beta sheet with strand five of the catalytic domain. This domain mediates dimerisation of the protein, with two proline residues present in the domain being critical for interaction.
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Jiyao W et al.(2023). "The conserved domain database in 2023.",