1m9b

<table><tr><td colspan='2'>[[1m9b]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/Blood_fluke Blood fluke]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1M9B OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1M9B FirstGlance]. <br>

</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=IBG:GAMMA-GLUTAMYL[S-(2-IODOBENZYL)CYSTEINYL]GLYCINE'>IBG</scene></td></tr>

<tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[1gta|1gta]], [[1gtb|1gtb]], [[1gne|1gne]], [[1m99|1m99]], [[1m9a|1m9a]]</td></tr>

<tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Glutathione_transferase Glutathione transferase], with EC number [http://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'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1m9b FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1m9b OCA], [http://pdbe.org/1m9b PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1m9b RCSB], [http://www.ebi.ac.uk/pdbsum/1m9b PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=1m9b ProSAT]</span></td></tr>

[[http://www.uniprot.org/uniprot/GST26_SCHJA GST26_SCHJA]] Conjugation of reduced glutathione to a wide number of exogenous and endogenous hydrophobic electrophiles. GST isoenzymes appear to play a central role in the parasite detoxification system. Other functions are also suspected including a role in increasing the solubility of haematin in the parasite gut.

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== Publication Abstract from PubMed ==

The 26-kDa glutathione S-transferase from Schistosoma japonicum (Sj26GST), a helminth worm that causes schistosomiasis, catalyzes the conjugation of glutathione with toxic secondary products of membrane lipid peroxidation. Crystal structures of Sj26GST in complex with glutathione sulfonate (Sj26GSTSLF), S-hexyl glutathione (Sj26GSTHEX), and S-2-iodobenzyl glutathione (Sj26GSTIBZ) allow characterization of the electrophile binding site (H site) of Sj26GST. The S-hexyl and S-2-iodobenzyl moieties of these product analogs bind in a pocket defined by side-chains from the beta1-alpha1 loop (Tyr7, Trp8, Ile10, Gly12, Leu13), helix alpha4 (Arg103, Tyr104, Ser107, Tyr111), and the C-terminal coil (Gln204, Gly205, Trp206, Gln207). Changes in the Ser107 and Gln204 dihedral angles make the H site more hydrophobic in the Sj26GSTHEX complex relative to the ligand-free structure. These structures, together with docking studies, indicate a possible binding mode of Sj26GST to its physiologic substrates 4-hydroxynon-2-enal (4HNE), trans-non-2-enal (NE), and ethacrynic acid (EA). In this binding mode, hydrogen bonds of Tyr111 and Gln207 to the carbonyl oxygen atoms of 4HNE, NE, and EA could orient the substrates and enhance their electrophilicity to promote conjugation with glutathione.

Characterization of the electrophile binding site and substrate binding mode of the 26-kDa glutathione S-transferase from Schistosoma japonicum.,Cardoso RM, Daniels DS, Bruns CM, Tainer JA Proteins. 2003 Apr 1;51(1):137-46. PMID:12596270<ref>PMID:12596270</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>

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== References ==

<references/>

[[Category: Blood fluke]]

[[Category: Glutathione transferase]]

[[Category: Bruns, C M]]

[[Category: Cardoso, R M.F]]

[[Category: Daniels, D S]]

[[Category: Tainer, J A]]

[[Category: Antigen]]

[[Category: Transferase]]