View source for 3g7j


==Crystal Structure of a Genetically Modified Delta Class GST (adGSTD4-4) from Anopheles dirus, Y119E, in Complex with S-Hexyl Glutathione==
<StructureSection load='3g7j' size='340' side='right'caption='[[3g7j]], [[Resolution|resolution]] 2.20&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[3g7j]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Anopheles_dirus Anopheles dirus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3G7J OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=3G7J 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]] 2.2&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=GTX:S-HEXYLGLUTATHIONE'>GTX</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=3g7j FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3g7j OCA], [https://pdbe.org/3g7j PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=3g7j RCSB], [https://www.ebi.ac.uk/pdbsum/3g7j PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=3g7j ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/Q9GN60_9DIPT Q9GN60_9DIPT] 
== 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/g7/3g7j_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=3g7j ConSurf].
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== Publication Abstract from PubMed ==
GST (glutathione transferase) is a dimeric enzyme recognized for biotransformation of xenobiotics and endogenous toxic compounds. In the present study, residues forming the hydrophobic substrate-binding site (H-site) of a Delta class enzyme were investigated in detail for the first time by site-directed mutagenesis and crystallographic studies. Enzyme kinetics reveal that Tyr111 indirectly stabilizes GSH binding, Tyr119 modulates hydrophobic substrate binding and Phe123 indirectly modulates catalysis. Mutations at Tyr111 and Phe123 also showed evidence for positive co-operativity for GSH and 1-chloro-2,4-dinitrobenzene respectively, strongly suggesting a role for these residues in manipulating subunit-subunit communication. In the present paper we report crystal structures of the wild-type enzyme, and two mutants, in complex with S-hexylglutathione. This study has identified an aromatic 'zipper' in the H-site contributing a network of aromatic pi-pi interactions. Several residues of the cluster directly interact with the hydrophobic substrate, whereas others indirectly maintain conformational stability of the dimeric structure through the C-terminal domain (domain II). The Y119E mutant structure shows major main-chain rearrangement of domain II. This reorganization is moderated through the 'zipper' that contributes to the H-site remodelling, thus illustrating a role in co-substrate binding modulation. The F123A structure shows molecular rearrangement of the H-site in one subunit, but not the other, explaining weakened hydrophobic substrate binding and kinetic co-operativity effects of Phe123 mutations. The three crystal structures provide comprehensive evidence of the aromatic 'zipper' residues having an impact upon protein stability, catalysis and specificity. Consequently, 'zipper' residues appear to modulate and co-ordinate substrate processing through permissive flexing.

Structural contributions of delta class glutathione transferase active-site residues to catalysis.,Wongsantichon J, Robinson RC, Ketterman AJ Biochem J. 2010 Apr 28;428(1):25-32. PMID:20196771<ref>PMID:20196771</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 3g7j" style="background-color:#fffaf0;"></div>

==See Also==
*[[Glutathione S-transferase 3D structures|Glutathione S-transferase 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Anopheles dirus]]
[[Category: Large Structures]]
[[Category: Ketterman AJ]]
[[Category: Robinson RC]]
[[Category: Wongsantichon J]]