Download MendeleyTrypanosoma Brucei Udp-Galactose-4-Epimerase in Ternary Complex with Nad+ and the Substrate Analogue Udp-4-Deoxy-4-Fluoro-Alpha-D-Galactose
Alphey, M.S., Burton, A., Urbaniak, M., Boons, G.J., Ferguson, M.A.J., Hunter, W.N.(2006) Acta Crystallogr Sect F Struct Biol Cryst Commun 62: 829
- PubMed: 16946458
- DOI: https://doi.org/10.1107/S1744309106028740
- Primary Citation of Related Structures:
2CNB - PubMed Abstract:
The structure of the NAD-dependent oxidoreductase UDP-galactose-4'-epimerase from Trypanosoma brucei in complex with cofactor and the substrate analogue UDP-4-deoxy-4-fluoro-alpha-D-galactose has been determined using diffraction data to 2.7 A resolution. Despite the high level of sequence and structure conservation between the trypanosomatid enzyme and those from humans, yeast and bacteria, the binding of the 4-fluoro-alpha-D-galactose moiety is distinct from previously reported structures. Of particular note is the observation that when bound to the T. brucei enzyme, the galactose moiety of this fluoro-derivative is rotated approximately 180 degrees with respect to the orientation of the hexose component of UDP-glucose when in complex with the human enzyme. The architecture of the catalytic centre is designed to effectively bind different orientations of the hexose, a finding that is consistent with a mechanism that requires the sugar to maintain a degree of flexibility within the active site.
Organizational Affiliation:
Division of Biological Chemistry and Molecular Microbiology, School of Life Sciences, University of Dundee, Dundee DD1 5EH, Scotland.
