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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<jats:italic>T. brucei<\/jats:italic>, 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<jats:italic>T. brucei<\/jats:italic>. 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<jats:italic>T. brucei<\/jats:italic>was expressed and the three-dimensional structure of the enzyme was solved by X-ray crystallography. In multiple crystallographic structures,<jats:italic>T. brucei<\/jats:italic>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.<\/jats:p>","DOI":"10.1107\/s2059798318009208","type":"journal-article","created":{"date-parts":[[2018,9,3]],"date-time":"2018-09-03T16:14:02Z","timestamp":1535991242000},"page":"861-876","update-policy":"https:\/\/doi.org\/10.1107\/cm_01","source":"Crossref","is-referenced-by-count":17,"title":["Structure and function of<scp>L<\/scp>-threonine-3-dehydrogenase from the parasitic protozoan<i>Trypanosoma brucei<\/i>revealed by X-ray crystallography and geometric simulations"],"prefix":"10.1107","volume":"74","author":[{"given":"Eyram","family":"Adjogatse","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Peter","family":"Erskine","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Stephen A.","family":"Wells","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"John M.","family":"Kelly","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jonathan D.","family":"Wilden","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2321-6296","authenticated-orcid":true,"given":"A. 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