4mu4: Difference between revisions
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==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== | ==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== | ||
<StructureSection load='4mu4' size='340' side='right' caption='[[4mu4]], [[Resolution|resolution]] 1.41Å' scene=''> | <StructureSection load='4mu4' size='340' side='right'caption='[[4mu4]], [[Resolution|resolution]] 1.41Å' scene=''> | ||
== Structural highlights == | == Structural highlights == | ||
<table><tr><td colspan='2'>[[4mu4]] is a 1 chain structure with sequence from [ | <table><tr><td colspan='2'>[[4mu4]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Arabidopsis_thaliana Arabidopsis thaliana]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4MU4 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4MU4 FirstGlance]. <br> | ||
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=EDO:1,2-ETHANEDIOL'>EDO</scene>, <scene name='pdbligand=IYP:(2R,3S)-2,3-DIHYDROXY-3-(1H-IMIDAZOL-5-YL)PROPYL+DIHYDROGEN+PHOSPHATE'>IYP</scene>, <scene name='pdbligand=MN:MANGANESE+(II)+ION'>MN</scene | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=EDO:1,2-ETHANEDIOL'>EDO</scene>, <scene name='pdbligand=IYP:(2R,3S)-2,3-DIHYDROXY-3-(1H-IMIDAZOL-5-YL)PROPYL+DIHYDROGEN+PHOSPHATE'>IYP</scene>, <scene name='pdbligand=MN:MANGANESE+(II)+ION'>MN</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=4mu4 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4mu4 OCA], [https://pdbe.org/4mu4 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4mu4 RCSB], [https://www.ebi.ac.uk/pdbsum/4mu4 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4mu4 ProSAT]</span></td></tr> | |||
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[ | |||
</table> | </table> | ||
== Function == | |||
[https://www.uniprot.org/uniprot/HIS5B_ARATH HIS5B_ARATH] | |||
<div style="background-color:#fffaf0;"> | <div style="background-color:#fffaf0;"> | ||
== Publication Abstract from PubMed == | == Publication Abstract from PubMed == | ||
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__TOC__ | __TOC__ | ||
</StructureSection> | </StructureSection> | ||
[[Category: | [[Category: Arabidopsis thaliana]] | ||
[[Category: | [[Category: Large Structures]] | ||
[[Category: Baker | [[Category: Baker PJ]] | ||
[[Category: Bisson | [[Category: Bisson C]] | ||
[[Category: Britton | [[Category: Britton KL]] | ||
[[Category: Rice | [[Category: Rice DW]] | ||
[[Category: Sedelnikova | [[Category: Sedelnikova SE]] | ||
Revision as of 13:09, 28 December 2022
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 resolutionThe 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
Structural highlights
FunctionPublication Abstract from PubMedImidazoleglycerol-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[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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