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(A) View of the buried ligands (NAD+ in yellow and UDP-glucose in red) and water molecules (blue) within the protein (SS is the presumptive sulfur donor site). The C-terminal flap, which may open to allow access to the sugar-dinucleotide-binding site, is shown in gold. (B) Surface representation highlighting the water molecules (blue spheres) at entrances of the large (LC) and small (SC) solvent channels leading into the SQD1 binding cleft.
