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(a) Overall structure of the NAL variant E192N homotetramer showing each chain of the NAL variant E192N as a coloured ribbon. In the green-coloured monomer both the Schiff-base complex between Lys165 and pyruvate and the mutated residue E192N are shown as sticks coloured by atom type. (b) View of a single NAL monomer, showing the location of the lysine–pyruvate Schiff base and the E192N mutation within the α/β barrel. This figure was generated using PyMOL v.0.99 (DeLano, 2002 ▶).
