1.1.1.265 crystal structures in an apo-form at 2.00 A and NADPH-complexed form at 2.40 A resolution. Gre2 forms a homodimer, each subunit of which contains an N-terminal Rossmann-fold domain and a variable C-terminal domain, which participates in substrate recognition. The induced fit upon binding to the cofactor NADPH makes the two domains shift toward each other, producing an interdomain cleft that better fits the substrate 1.1.1.265 in complex with NADP, to 3.2 A resolution. Monoclinic space group P21, two Gre2 protomers per asymmetric unit