2xtb

Crystal Structure of Trypanosoma brucei rhodesiense Adenosine Kinase Complexed with Activator

spinqualitylabelsall models 2xtb, resolution 2.80Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2xtb is a 1 chain structure with sequence from Trypanosoma brucei rhodesiense. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.8Å Ligands: KRM Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function Q584S0_TRYB2 Publication Abstract from PubMed BACKGROUND: The essential purine salvage pathway of Trypanosoma brucei bears interesting catalytic enzymes for chemotherapeutic intervention of Human African Trypanosomiasis. Unlike mammalian cells, trypanosomes lack de novo purine synthesis and completely rely on salvage from their hosts. One of the key enzymes is adenosine kinase which catalyzes the phosphorylation of ingested adenosine to form adenosine monophosphate (AMP) utilizing adenosine triphosphate (ATP) as the preferred phosphoryl donor. METHODS AND FINDINGS: Here, we present the first structures of Trypanosoma brucei rhodesiense adenosine kinase (TbrAK): the structure of TbrAK in complex with the bisubstrate inhibitor P(1),P(5)-di(adenosine-5')-pentaphosphate (AP5A) at 1.55 A, and TbrAK complexed with the recently discovered activator 4-[5-(4-phenoxyphenyl)-2H-pyrazol-3-yl]morpholine (compound 1) at 2.8 A resolution. CONCLUSIONS: The structural details and their comparison give new insights into substrate and activator binding to TbrAK at the molecular level. Further structure-activity relationship analyses of a series of derivatives of compound 1 support the observed binding mode of the activator and provide a possible mechanism of action with respect to their activating effect towards TbrAK. Crystal Structures of T. b. rhodesiense Adenosine Kinase Complexed with Inhibitor and Activator: Implications for Catalysis and Hyperactivation.,Kuettel S, Greenwald J, Kostrewa D, Ahmed S, Scapozza L, Perozzo R PLoS Negl Trop Dis. 2011 May;5(5):e1164. Epub 2011 May 24. PMID:21629723 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Adenosine kinase 3D structures

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