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The active center of SQD1. (A) Stereoview showing the bound NAD+ (aqua), UDP-glucose (red), and Wat2 (arrowhead) with respect to presumed catalytic residues of SQD1 active site. (B) A close-up view of the tightly bound water Wat2 and its interactions with Thr-145 and the hexose ring. All hydrogen bonds (dotted lines) involving Thr-145 and bound water are 2.4 Å. The figure was generated by using setor (48).
