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== | ==Crystal structure of 3-dehydroquinate synthase (DHQS) in complex with ZN2+ and NAD== | ||
<StructureSection load='1nrx' size='340' side='right'caption='[[1nrx]], [[Resolution|resolution]] 2.90Å' scene=''> | |||
== Structural highlights == | |||
<table><tr><td colspan='2'>[[1nrx]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Aspergillus_nidulans Aspergillus nidulans]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1NRX OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1NRX FirstGlance]. <br> | |||
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.9Å</td></tr> | |||
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CL:CHLORIDE+ION'>CL</scene>, <scene name='pdbligand=NAD:NICOTINAMIDE-ADENINE-DINUCLEOTIDE'>NAD</scene>, <scene name='pdbligand=ZN:ZINC+ION'>ZN</scene></td></tr> | |||
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=1nrx FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1nrx OCA], [https://pdbe.org/1nrx PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1nrx RCSB], [https://www.ebi.ac.uk/pdbsum/1nrx PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1nrx ProSAT]</span></td></tr> | |||
</table> | |||
== Function == | |||
[https://www.uniprot.org/uniprot/ARO1_EMENI ARO1_EMENI] The AROM polypeptide catalyzes 5 consecutive enzymatic reactions in prechorismate polyaromatic amino acid biosynthesis.[HAMAP-Rule:MF_03143] | |||
== Evolutionary Conservation == | |||
[[Image:Consurf_key_small.gif|200px|right]] | |||
Check<jmol> | |||
<jmolCheckbox> | |||
<scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/nr/1nrx_consurf.spt"</scriptWhenChecked> | |||
<scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked> | |||
<text>to colour the structure by Evolutionary Conservation</text> | |||
</jmolCheckbox> | |||
</jmol>, as determined by [http://consurfdb.tau.ac.il/ ConSurfDB]. You may read the [[Conservation%2C_Evolutionary|explanation]] of the method and the full data available from [http://bental.tau.ac.il/new_ConSurfDB/main_output.php?pdb_ID=1nrx ConSurf]. | |||
<div style="clear:both"></div> | |||
<div style="background-color:#fffaf0;"> | |||
== 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. | 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<ref>PMID:12614613</ref> | |||
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | |||
</div> | |||
<div class="pdbe-citations 1nrx" style="background-color:#fffaf0;"></div> | |||
[[Category: | == References == | ||
[[Category: | <references/> | ||
[[Category: Hawkins | __TOC__ | ||
[[Category: Lamb | </StructureSection> | ||
[[Category: Nichols | [[Category: Aspergillus nidulans]] | ||
[[Category: Ren | [[Category: Large Structures]] | ||
[[Category: Stammers | [[Category: Hawkins AR]] | ||
[[Category: Lamb HK]] | |||
[[Category: Nichols CE]] | |||
[[Category: Ren J]] | |||
[[Category: Stammers DK]] | |||
Latest revision as of 10:20, 25 October 2023
Crystal structure of 3-dehydroquinate synthase (DHQS) in complex with ZN2+ and NADCrystal structure of 3-dehydroquinate synthase (DHQS) in complex with ZN2+ and NAD
Structural highlights
FunctionARO1_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 PubMedIn 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[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References |
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