3szu

IspH:HMBPP complex structure of E126Q mutant

spinqualitylabelsall models 3szu, resolution 1.40Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3szu is a 2 chain structure with sequence from Escherichia coli K-12. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.4Å Ligands: H6P Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function ISPH_ECOLI Converts 1-hydroxy-2-methyl-2-(E)-butenyl 4-diphosphate into isopentenyl diphosphate (IPP) and dimethylallyl diphosphate (DMAPP). Is also involved in penicillin tolerance and control of the stringent response. Seems to directly or indirectly interact with RelA to maintain it in an inactive form during normal growth. Publication Abstract from PubMed Isoprenoids derive from two universal precursors, isopentenyl diphosphate and dimethylallyl diphosphate, which in most human pathogens are synthesized in the deoxyxylulose phosphate pathway. The last step of this pathway is the conversion of (E)-1-hydroxy-2-methylbut-2-enyl-4-diphosphate into a mixture of isopentenyl diphosphate and dimethylallyl diphosphate catalyzed by the iron-sulfur protein IspH. The crystal structures reported here of the IspH mutant proteins T167C, E126D and E126Q reveal an alternative substrate conformation compared to the wild-type structure. Thus, the previously observed alkoxide complex decomposes, and the substrate's hydroxymethyl group rotates to interact with Glu126. The carboxyl group of Glu126 then donates a proton to the hydroxyl group to enable water elimination. The structural and functional studies provide further knowledge of the IspH reaction mechanism, which opens up new routes to inhibitor design against malaria and tuberculosis. Crystal Structures of Mutant IspH Proteins Reveal a Rotation of the Substrate's Hydroxymethyl Group during Catalysis.,Span I, Grawert T, Bacher A, Eisenreich W, Groll M J Mol Biol. 2011 Nov 23. PMID:22137895 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also 4-hydroxy-3-methylbut-2-enyl diphosphate reductase 3D structures

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