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| | <StructureSection load='2c3q' size='340' side='right'caption='[[2c3q]], [[Resolution|resolution]] 1.85Å' scene=''> | | <StructureSection load='2c3q' size='340' side='right'caption='[[2c3q]], [[Resolution|resolution]] 1.85Å' scene=''> |
| | == Structural highlights == | | == Structural highlights == |
| - | <table><tr><td colspan='2'>[[2c3q]] is a 4 chain structure with sequence from [https://en.wikipedia.org/wiki/Human Human]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2C3Q OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2C3Q FirstGlance]. <br> | + | <table><tr><td colspan='2'>[[2c3q]] is a 4 chain structure with sequence from [https://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2C3Q OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2C3Q FirstGlance]. <br> |
| - | </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>, <scene name='pdbligand=IOD:IODIDE+ION'>IOD</scene></td></tr> | + | </td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 1.85Å</td></tr> |
| - | <tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat"><div style='overflow: auto; max-height: 3em;'>[[2c3n|2c3n]], [[2c3t|2c3t]]</div></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>, <scene name='pdbligand=IOD:IODIDE+ION'>IOD</scene></td></tr> |
| - | <tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[https://en.wikipedia.org/wiki/Glutathione_transferase Glutathione transferase], with EC number [https://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.5.1.18 2.5.1.18] </span></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=2c3q FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2c3q OCA], [https://pdbe.org/2c3q PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2c3q RCSB], [https://www.ebi.ac.uk/pdbsum/2c3q PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2c3q ProSAT]</span></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=2c3q FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2c3q OCA], [https://pdbe.org/2c3q PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2c3q RCSB], [https://www.ebi.ac.uk/pdbsum/2c3q PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2c3q ProSAT]</span></td></tr> |
| | </table> | | </table> |
| | + | == Function == |
| | + | [https://www.uniprot.org/uniprot/GSTT1_HUMAN GSTT1_HUMAN] Conjugation of reduced glutathione to a wide number of exogenous and endogenous hydrophobic electrophiles. Acts on 1,2-epoxy-3-(4-nitrophenoxy)propane, phenethylisothiocyanate 4-nitrobenzyl chloride and 4-nitrophenethyl bromide. Displays glutathione peroxidase activity with cumene hydroperoxide.<ref>PMID:16298388</ref> <ref>PMID:20097269</ref> |
| | == Evolutionary Conservation == | | == Evolutionary Conservation == |
| | [[Image:Consurf_key_small.gif|200px|right]] | | [[Image:Consurf_key_small.gif|200px|right]] |
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| | __TOC__ | | __TOC__ |
| | </StructureSection> | | </StructureSection> |
| - | [[Category: Glutathione transferase]] | + | [[Category: Homo sapiens]] |
| - | [[Category: Human]]
| + | |
| | [[Category: Large Structures]] | | [[Category: Large Structures]] |
| - | [[Category: Kleywegt, G J]] | + | [[Category: Kleywegt GJ]] |
| - | [[Category: Larsson, A K]] | + | [[Category: Larsson A-K]] |
| - | [[Category: Mannervik, B]] | + | [[Category: Mannervik B]] |
| - | [[Category: Olin, B]] | + | [[Category: Olin B]] |
| - | [[Category: Shokeer, A]] | + | [[Category: Shokeer A]] |
| - | [[Category: Tars, K]] | + | [[Category: Tars K]] |
| - | [[Category: Glutathione]]
| + | |
| - | [[Category: Polymorphism]]
| + | |
| - | [[Category: T1-1]]
| + | |
| - | [[Category: Transferase]]
| + | |
| Structural highlights
Function
GSTT1_HUMAN Conjugation of reduced glutathione to a wide number of exogenous and endogenous hydrophobic electrophiles. Acts on 1,2-epoxy-3-(4-nitrophenoxy)propane, phenethylisothiocyanate 4-nitrobenzyl chloride and 4-nitrophenethyl bromide. Displays glutathione peroxidase activity with cumene hydroperoxide.[1] [2]
Evolutionary Conservation
Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.
Publication Abstract from PubMed
The crystal structures of wild-type human theta class glutathione-S-transferase (GST) T1-1 and its W234R mutant, where Trp234 was replaced by Arg, were solved both in the presence and absence of S-hexyl-glutathione. The W234R mutant was of interest due to its previously observed enhanced catalytic activity compared to the wild-type enzyme. GST T1-1 from rat and mouse naturally contain Arg in position 234, with correspondingly high catalytic efficiency. The overall structure of GST T1-1 is similar to that of GST T2-2, as expected from their 53% sequence identity at the protein level. Wild-type GST T1-1 has the side-chain of Trp234 occupying a significant portion of the active site. This bulky residue prevents efficient binding of both glutathione and hydrophobic substrates through steric hindrance. The wild-type GST T1-1 crystal structure, obtained from co-crystallization experiments with glutathione and its derivatives, showed no electron density for the glutathione ligand. However, the structure of GST T1-1 mutant W234R showed clear electron density for S-hexyl-glutathione after co-crystallization. In contrast to Trp234 in the wild-type structure, the side-chain of Arg234 in the mutant does not occupy any part of the substrate-binding site. Instead, Arg234 is pointing in a different direction and, in addition, interacts with the carboxylate group of glutathione. These findings explain our earlier observation that the W234R mutant has a markedly improved catalytic activity with most substrates tested to date compared to the wild-type enzyme. GST T1-1 catalyzes detoxication reactions as well as reactions that result in toxic products, and our findings therefore suggest that humans have gained an evolutionary advantage by a partially disabled active site.
Structural basis of the suppressed catalytic activity of wild-type human glutathione transferase T1-1 compared to its W234R mutant.,Tars K, Larsson AK, Shokeer A, Olin B, Mannervik B, Kleywegt GJ J Mol Biol. 2006 Jan 6;355(1):96-105. Epub 2005 Nov 8. PMID:16298388[3]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
See Also
References
- ↑ Tars K, Larsson AK, Shokeer A, Olin B, Mannervik B, Kleywegt GJ. Structural basis of the suppressed catalytic activity of wild-type human glutathione transferase T1-1 compared to its W234R mutant. J Mol Biol. 2006 Jan 6;355(1):96-105. Epub 2005 Nov 8. PMID:16298388 doi:10.1016/j.jmb.2005.10.049
- ↑ Shokeer A, Mannervik B. Residue 234 is a master switch of the alternative-substrate activity profile of human and rodent theta class glutathione transferase T1-1. Biochim Biophys Acta. 2010 Apr;1800(4):466-73. PMID:20097269 doi:10.1016/j.bbagen.2010.01.003
- ↑ Tars K, Larsson AK, Shokeer A, Olin B, Mannervik B, Kleywegt GJ. Structural basis of the suppressed catalytic activity of wild-type human glutathione transferase T1-1 compared to its W234R mutant. J Mol Biol. 2006 Jan 6;355(1):96-105. Epub 2005 Nov 8. PMID:16298388 doi:10.1016/j.jmb.2005.10.049
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