View source for 2wxb


==Acetylglutamate kinase from Escherichia coli free of substrates==
<StructureSection load='2wxb' size='340' side='right'caption='[[2wxb]], [[Resolution|resolution]] 2.00&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[2wxb]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Escherichia_coli_BL21(DE3) Escherichia coli BL21(DE3)]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2WXB OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2WXB 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&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=ACT:ACETATE+ION'>ACT</scene>, <scene name='pdbligand=DTU:(2R,3S)-1,4-DIMERCAPTOBUTANE-2,3-DIOL'>DTU</scene>, <scene name='pdbligand=EDO:1,2-ETHANEDIOL'>EDO</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=2wxb FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2wxb OCA], [https://pdbe.org/2wxb PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2wxb RCSB], [https://www.ebi.ac.uk/pdbsum/2wxb PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2wxb ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/ARGB_ECOLI ARGB_ECOLI] 
== 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/wx/2wxb_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=2wxb ConSurf].
<div style="clear:both"></div>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
N-Acetyl-L-glutamate kinase (NAGK), the paradigm enzyme of the amino acid kinase family, catalyzes the second step of arginine biosynthesis. Although substrate binding and catalysis were clarified by the determination of four crystal structures of the homodimeric Escherichia coli enzyme (EcNAGK), we now determine 2 A resolution crystal structures of EcNAGK free from substrates or complexed with the product N-acetyl-L-glutamyl-5-phosphate (NAGP) and with sulfate, which reveal a novel, very open NAGK conformation to which substrates would associate and from which products would dissociate. In this conformation, the C-domain, which hosts most of the nucleotide site, rotates approximately 24 degrees -28 degrees away from the N-domain, which hosts the acetylglutamate site, whereas the empty ATP site also exhibits some changes. One sulfate is found binding in the region where the beta-phosphate of ATP normally binds, suggesting that ATP is first anchored to the beta-phosphate site, before perfect binding by induced fit, triggering the shift to the closed conformation. In contrast, the acetylglutamate site is always well formed, although its beta-hairpin lid is found here to be mobile, being closed only in the subunit of the EcNAGK-NAGP complex that binds NAGP most strongly. Lid closure appears to increase the affinity for acetylglutamate/NAGP and to stabilize the closed enzyme conformation via lid-C-domain contacts. Our finding of NAGP bound to the open conformation confirms that this product dissociates from the open enzyme form and allows reconstruction of the active center in the ternary complex with both products, delineating the final steps of the reaction, which is shown here by site-directed mutagenesis to involve centrally the invariant residue Gly11.

Two crystal structures of Escherichia coli N-acetyl-L-glutamate kinase demonstrate the cycling between open and closed conformations.,Gil-Ortiz F, Ramon-Maiques S, Fernandez-Murga ML, Fita I, Rubio V J Mol Biol. 2010 Jun 11;399(3):476-90. Epub 2010 Apr 18. PMID:20403363<ref>PMID:20403363</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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<div class="pdbe-citations 2wxb" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Gil-Ortiz F]]
[[Category: Ramon-Maiques S]]
[[Category: Rubio V]]