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Structure of HutP-L-His (PDB code: 1VEA). The L-histidine analog (L-histidine β-naphthylamide; HBN) is shown as a stick model. Different HutP monomers are shown in different colors. A yellow-colored stick model represents HBN. a Cα backbone chain presentation of the HutP hexamer and HBN, viewed along the threefold symmetry axis, b ribbon presentation of the HutP dimer and HBN, c L-His binding site in the HutP-L-His complex. Dotted lines Hydrogen bonds
