5k4u

Three-dimensional structure of L-threonine 3-dehydrogenase from Trypanosoma brucei showing different active site loop conformations between dimer subunits, refined to 1.9 angstroms

spinqualitylabelsall models 5k4u, resolution 1.90Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 5k4u is a 2 chain structure with sequence from Trypanosoma (trypanozoon) brucei. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: ACT, GOL, NAD Activity: L-threonine 3-dehydrogenase, with EC number 1.1.1.103 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed Two of the world's most neglected tropical diseases, human African trypanosomiasis (HAT) and Chagas disease, are caused by protozoan parasites of the genus Trypanosoma. These organisms possess specialized metabolic pathways, frequently distinct from those in humans, which have potential to be exploited as novel drug targets. This study elucidates the structure and function of L-threonine-3-dehydrogenase (TDH) from T. brucei, the causative pathogen of HAT. TDH is a key enzyme in the metabolism of L-threonine, and an inhibitor of TDH has been shown to have trypanocidal activity in the procyclic form of T. brucei. TDH is a nonfunctional pseudogene in humans, suggesting that it may be possible to rationally design safe and specific therapies for trypanosomiasis by targeting this parasite enzyme. As an initial step, the TDH gene from T. brucei was expressed and the three-dimensional structure of the enzyme was solved by X-ray crystallography. In multiple crystallographic structures, T. brucei TDH is revealed to be a dimeric short-chain dehydrogenase that displays a considerable degree of conformational variation in its ligand-binding regions. Geometric simulations of the structure have provided insight into the dynamic behaviour of this enzyme. Furthermore, structures of TDH bound to its natural substrates and known inhibitors have been determined, giving an indication of the mechanism of catalysis of the enzyme. Collectively, these results provide vital details for future drug design to target TDH or related enzymes. Structure and function of L-threonine-3-dehydrogenase from the parasitic protozoan Trypanosoma brucei revealed by X-ray crystallography and geometric simulations.,Adjogatse E, Erskine P, Wells SA, Kelly JM, Wilden JD, Chan AWE, Selwood D, Coker A, Wood S, Cooper JB Acta Crystallogr D Struct Biol. 2018 Sep 1;74(Pt 9):861-876. doi:, 10.1107/S2059798318009208. Epub 2018 Sep 3. PMID:30198897 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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