4i72 | pdb_00004i72

Crystal structure of the Trypanosoma brucei Inosine-Adenosine-Guanosine nucleoside hydrolase in complex with Immucillin A

spinqualitylabelsall models 4i72, resolution 2.05Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 4i72 is a 2 chain structure with sequence from Tryb2. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: CA, NI, TRS, UA2 Related: 3epw, 3fz0, 4i70, 4i71, 4i73, 4i74, 4i75 Gene: Tb927.3.2960 (TRYB2) Activity: Purine nucleosidase, with EC number 3.2.2.1 Resources: FirstGlance, OCA, RCSB, PDBsum Publication Abstract from PubMed Sleeping sickness is a deadly disease that primarily affects sub-Saharan Africa and is caused by protozoan parasites of the Trypanosoma genus. Trypanosomes are purine auxotrophs and their uptake pathway has long been appreciated as an attractive target for drug design. Recently, one tight-binding competitive inhibitor of the trypanosomal purine-specific nucleoside hydrolase (IAGNH) showed remarkable trypanocidal activity in a murine model of infection. Here, the enzymatic characterization of T. brucei brucei IAGNH is presented, together with its high-resolution structures in the unliganded form and in complexes with different inhibitors, including the trypanocidal compound UAMC-00363. A description of the crucial contacts that account for the high-affinity inhibition of IAGNH by iminoribitol-based compounds is provided and the molecular mechanism underlying the conformational change necessary for enzymatic catalysis is identified. It is demonstrated for the first time that metalorganic complexes can compete for binding at the active site of nucleoside hydrolase enzymes, mimicking the positively charged transition state of the enzymatic reaction. Moreover, we show that divalent metal ions can act as noncompetitive IAGNH inhibitors, stabilizing a nonproductive conformation of the catalytic loop. These results open a path for rational improvement of the potency and the selectivity of existing compounds and suggest new scaffolds that may be used as blueprints for the design of novel antitrypanosomal compounds. Structures of purine nucleosidase from Trypanosoma brucei bound to isozyme-specific trypanocidals and a novel metalorganic inhibitor.,Giannese F, Berg M, Van der Veken P, Castagna V, Tornaghi P, Augustyns K, Degano M Acta Crystallogr D Biol Crystallogr. 2013 Aug;69(Pt 8):1553-66. doi:, 10.1107/S0907444913010792. Epub 2013 Jul 20. PMID:23897478 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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