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The isothermal titration calorimetry (ITC) showed a high binding affinity (dissociation constant, Kd, 3.43 μM) of NADP to the enzyme. Comparative structural analysis showed a distinct substrate-binding pocket (SBP) loop with a spacious and hydrophobic substrate-binding pocket in HaFDL, consistent with the biochemically observed promiscuous substrate specificity. Finally, based on the crystal structure, substrate modeling and structural comparison with homologs, a two-step reaction mechanism is proposed. Overall, the findings significant