4mu4 | pdb_00004mu4

The form B structure of an E21Q catalytic mutant of A. thaliana IGPD2 in complex with Mn2+ and its substrate, 2R3S-IGP, to 1.41 A resolution

spinqualitylabelsall models 4mu4, resolution 1.41Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 4mu4 is a 1 chain structure with sequence from Arabidopsis thaliana. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.41Å Ligands: EDO, IYP, MN Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function HIS5B_ARATH Publication Abstract from PubMed Imidazoleglycerol-phosphate dehydratase (IGPD) catalyzes the Mn(II)-dependent dehydration of imidazoleglycerol phosphate (IGP) to 3-(1H-imidazol-4-yl)-2-oxopropyl dihydrogen phosphate during biosynthesis of histidine. As part of a program of herbicide design, we have determined a series of high-resolution crystal structures of an inactive mutant of IGPD2 from Arabidopsis thaliana in complex with IGP. The structures represent snapshots of the enzyme trapped at different stages of the catalytic cycle and show how substrate binding triggers a switch in the coordination state of an active site Mn(II) between six- and five-coordinate species. This switch is critical to prime the active site for catalysis, by facilitating the formation of a high-energy imidazolate intermediate. This work not only provides evidence for the molecular processes that dominate catalysis in IGPD, but also describes how the manipulation of metal coordination can be linked to discrete steps in catalysis, demonstrating one way that metalloenzymes exploit the unique properties of metal ions to diversify their chemistry. Crystal Structures Reveal that the Reaction Mechanism of Imidazoleglycerol-Phosphate Dehydratase Is Controlled by Switching Mn(II) Coordination.,Bisson C, Britton KL, Sedelnikova SE, Rodgers HF, Eadsforth TC, Viner RC, Hawkes TR, Baker PJ, Rice DW Structure. 2015 Jul 7;23(7):1236-45. doi: 10.1016/j.str.2015.05.012. Epub 2015, Jun 18. PMID:26095028 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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