View source for 2e2q


==Crystal structure of Sulfolobus tokodaii hexokinase in complex with xylose, Mg2+, and ADP==
<StructureSection load='2e2q' size='340' side='right'caption='[[2e2q]], [[Resolution|resolution]] 2.00&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[2e2q]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Sulfurisphaera_tokodaii Sulfurisphaera tokodaii]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2E2Q OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2E2Q 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=ADP:ADENOSINE-5-DIPHOSPHATE'>ADP</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene>, <scene name='pdbligand=XYP:BETA-D-XYLOPYRANOSE'>XYP</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=2e2q FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2e2q OCA], [https://pdbe.org/2e2q PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2e2q RCSB], [https://www.ebi.ac.uk/pdbsum/2e2q PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2e2q ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/Q96Y14_SULTO Q96Y14_SULTO] 
== 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/e2/2e2q_consurf.spt"</scriptWhenChecked>
    <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview03.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=2e2q ConSurf].
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== Publication Abstract from PubMed ==
Hexokinase catalyzes the phosphorylation of glucose to glucose 6-phosphate by using ATP as a phosphoryl donor. Recently, we identified and characterized an ATP-dependent hexokinase (StHK) from the hyperthermophilic archaeon Sulfolobus tokodaii, which can phosphorylate a broad range of sugar substrates, including glucose, mannose, glucosamine, and N-acetylglucosamine. Here we present the crystal structures of StHK in four different forms: (i) apo-form, (ii) binary complex with glucose, (iii) binary complex with ADP, and (iv) quaternary complex with xylose, Mg(2+), and ADP. Forms i and iii are in the open state, and forms ii and iv are in the closed state, indicating that sugar binding induces a large conformational change, whereas ADP binding does not. The four different crystal structures of the same enzyme provide "snapshots" of the conformational changes during the catalytic cycle. StHK exhibits a core fold characteristic of the hexokinase family, but the structures of several loop regions responsible for substrate binding are significantly different from those of other known hexokinase family members. Structural comparison of StHK with human N-acetylglucosamine kinase and other hexokinases provides an explanation for the ability of StHK to phosphorylate both glucose and N-acetylglucosamine. A Mg(2+) ion and coordinating water molecules are well defined in the electron density of the quaternary complex structure. This structure represents the first direct visualization of the binding mode for magnesium to hexokinase and thus allows for a better understanding of the catalytic mechanism proposed for the entire hexokinase family.

Crystal structures of an ATP-dependent hexokinase with broad substrate specificity from the hyperthermophilic archaeon Sulfolobus tokodaii.,Nishimasu H, Fushinobu S, Shoun H, Wakagi T J Biol Chem. 2007 Mar 30;282(13):9923-31. Epub 2007 Jan 17. PMID:17229727<ref>PMID:17229727</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 2e2q" style="background-color:#fffaf0;"></div>

==See Also==
*[[Hexokinase 3D structures|Hexokinase 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Sulfurisphaera tokodaii]]
[[Category: Fushinobu S]]
[[Category: Nishimasu H]]
[[Category: Shoun H]]
[[Category: Wakagi T]]