1nrx

Crystal structure of 3-dehydroquinate synthase (DHQS) in complex with ZN2+ and NAD

spinqualitylabelsall models 1nrx, resolution 2.90Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1nrx is a 2 chain structure with sequence from Aspergillus nidulans. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.9Å Ligands: CL, NAD, ZN Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function ARO1_EMENI The AROM polypeptide catalyzes 5 consecutive enzymatic reactions in prechorismate polyaromatic amino acid biosynthesis.[HAMAP-Rule:MF_03143] Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMed In order to investigate systematically substrate and cofactor-induced conformational changes in the enzyme dehydroquinate synthase (DHQS), eight structures representing a series of differently liganded states have been determined in a total of six crystal forms. DHQS in the absence of the substrate analogue carbaphosphonate, either unliganded or in the presence of NAD or ADP, is in an open form where a relative rotation of 11-13 degrees between N and C-terminal domains occurs.Analysis of torsion angle difference plots between sets of structures reveals eight rearrangements that appear relevant to domain closure and a further six related to crystal packing. Overlapping 21 different copies of the individual N and C-terminal DHQS domains further reveals a series of pivot points about which these movements occur and illustrates the way in which widely separated secondary structure elements are mechanically inter-linked to form "composite elements", which propagate structural changes across large distances.This analysis has provided insight into the basis of DHQS ligand-initiated domain closure and gives rise to the proposal of an ordered sequence of events involving substrate binding, and local rearrangements within the active site that are propagated to the hinge regions, leading to closure of the active-site cleft. Ligand-induced conformational changes and a mechanism for domain closure in Aspergillus nidulans dehydroquinate synthase.,Nichols CE, Ren J, Lamb HK, Hawkins AR, Stammers DK J Mol Biol. 2003 Mar 14;327(1):129-44. PMID:12614613 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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