Abstract
Saturation transfer difference (STD) NMR experiments reveal the binding epitopes of UDP-Gal and UDP-Glc bound to the glycosyltransferase β4Gal-T1. Whereas the enzyme recognizes the galactose residue in UDP-Gal, it does not make any close contacts with the glucose residue in UDP-Glc. This observation explains why β4Gal-T1 binds to UDP-Glc but is unable to transfer glucose to an acceptor substrate.
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