2d5c: Difference between revisions
New page: left|200px<br /><applet load="2d5c" size="350" color="white" frame="true" align="right" spinBox="true" caption="2d5c, resolution 1.65Å" /> '''Crystal Structure of... |
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== | ==Crystal Structure of Shikimate 5-Dehydrogenase (AroE) from Thermus Thermophilus HB8 in complex with shikimate== | ||
Shikimate dehydrogenase (EC 1.1.1.25) catalyses the fourth step of the | <StructureSection load='2d5c' size='340' side='right'caption='[[2d5c]], [[Resolution|resolution]] 1.65Å' scene=''> | ||
== Structural highlights == | |||
<table><tr><td colspan='2'>[[2d5c]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Thermus_thermophilus_HB8 Thermus thermophilus HB8]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2D5C OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2D5C 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]] 1.65Å</td></tr> | |||
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=SKM:(3R,4S,5R)-3,4,5-TRIHYDROXYCYCLOHEX-1-ENE-1-CARBOXYLIC+ACID'>SKM</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</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=2d5c FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2d5c OCA], [https://pdbe.org/2d5c PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2d5c RCSB], [https://www.ebi.ac.uk/pdbsum/2d5c PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2d5c ProSAT], [https://www.topsan.org/Proteins/RSGI/2d5c TOPSAN]</span></td></tr> | |||
</table> | |||
== Function == | |||
[https://www.uniprot.org/uniprot/AROE_THET8 AROE_THET8] Involved in the biosynthesis of the chorismate, which leads to the biosynthesis of aromatic amino acids. Catalyzes the reversible NADPH linked reduction of 3-dehydroshikimate (DHSA) to yield shikimate (SA).[HAMAP-Rule:MF_00222] | |||
== 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/d5/2d5c_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=2d5c ConSurf]. | |||
<div style="clear:both"></div> | |||
<div style="background-color:#fffaf0;"> | |||
== Publication Abstract from PubMed == | |||
Shikimate dehydrogenase (EC 1.1.1.25) catalyses the fourth step of the shikimate pathway which is required for the synthesis of the aromatic amino acids and other aromatic compounds in bacteria, microbial eukaryotes, and plants. The crystal structures of the shikimate dehydrogenase AroE from Thermus thermophilus HB8 in its ligand-free form, binary complexes with cofactor NADP+ or substrate shikimate, and the ternary complex with both NADP(H) and shikimate were determined by X-ray diffraction method at atomic resolutions. The crystals are nearly isomorphous with the asymmetric unit containing a dimer, each subunit of which has a bi-domain structure of compact alpha/beta sandwich folds. The two subunits of the enzyme display asymmetry in the crystals due to different relative orientations between the N- and C-terminal domains resulting in a slightly different closure of the interdomain clefts. NADP(H) is bound to the more closed form only. This closed conformation with apparent higher affinity to the cofactor is also observed in the unliganded crystal form, indicating that the NADP(H) binding to TtAroE may follow the selection mode where the cofactor binds to the subunit that happens to be in the closed conformation in solution. Crystal structures of the closed subunits with and without NADP(H) show no significant structural difference, suggesting that the cofactor binding to the closed subunit corresponds to the lock-and-key model in TtAroE. On the other hand, shikimate binds to both open and closed subunit conformers of both apo and NADP(H)-liganded holo enzyme forms. The ternary complex TtAroE:NADP(H):shikimate allows unambiguous visualization of the SDH permitting elucidation of the roles of conserved residues Lys64 and Asp100 in the hydride ion transfer between NADP(H) and shikimate. | |||
Crystal structures of shikimate dehydrogenase AroE from Thermus thermophilus HB8 and its cofactor and substrate complexes: insights into the enzymatic mechanism.,Bagautdinov B, Kunishima N J Mol Biol. 2007 Oct 19;373(2):424-38. Epub 2007 Aug 21. PMID:17825835<ref>PMID:17825835</ref> | |||
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | |||
</div> | |||
<div class="pdbe-citations 2d5c" style="background-color:#fffaf0;"></div> | |||
==See Also== | |||
*[[Shikimate dehydrogenase 3D structures|Shikimate dehydrogenase 3D structures]] | |||
== References == | |||
<references/> | |||
__TOC__ | |||
</StructureSection> | |||
[[Category: Large Structures]] | |||
[[Category: Thermus thermophilus HB8]] | |||
[[Category: Bagautdinov B]] | |||
[[Category: Kunishima N]] | |||
