7nc1: Difference between revisions
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The | ==Glutathione-S-transferase GliG with partially disordered active site== | ||
<StructureSection load='7nc1' size='340' side='right'caption='[[7nc1]], [[Resolution|resolution]] 2.60Å' scene=''> | |||
== Structural highlights == | |||
<table><tr><td colspan='2'>[[7nc1]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Aspfc Aspfc]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=7NC1 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=7NC1 FirstGlance]. <br> | |||
</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></td></tr> | |||
<tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat"><div style='overflow: auto; max-height: 3em;'>[[7nc3|7nc3]]</div></td></tr> | |||
<tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">AFUB_075740 ([https://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=451804 ASPFC])</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=7nc1 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=7nc1 OCA], [https://pdbe.org/7nc1 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=7nc1 RCSB], [https://www.ebi.ac.uk/pdbsum/7nc1 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=7nc1 ProSAT]</span></td></tr> | |||
</table> | |||
<div style="background-color:#fffaf0;"> | |||
== Publication Abstract from PubMed == | |||
Glutathione-S-transferases (GSTs) usually detoxify xenobiotics. The human pathogenic fungus Aspergillus fumigatus however uses the exceptional GST GliG to incorporate two sulphur atoms into its virulence factor gliotoxin. Because these sulphurs are essential for biological activity, glutathionylation is a key step of gliotoxin biosynthesis. Yet, the mechanism of carbon-sulphur linkage formation from a bis-hydroxylated precursor is unresolved. Here, we report structures of GliG with glutathione (GSH) and its reaction product cyclo[-l-Phe-l-Ser]-bis-glutathione, which has been purified from a genetically modified A. fumigatus strain. The structures argue for stepwise processing of first the Phe and second the Ser moiety. Enzyme-mediated dehydration of the substrate activates GSH and a helix dipole stabilizes the resulting anion via a water molecule for the nucleophilic attack. Activity assays with mutants validate the interactions of GliG with the ligands and enrich our knowledge about enzymatic C-S bond formation in gliotoxin and epipolythiodioxopiperazine (ETP) natural compounds in general. | |||
Structural and mechanistic insights into C-S bond formation in gliotoxin.,Scherlach K, Kuttenlochner W, Scharf DH, Brakhage AA, Hertweck C, Groll M, Huber E Angew Chem Int Ed Engl. 2021 Apr 28. doi: 10.1002/anie.202104372. PMID:33909314<ref>PMID:33909314</ref> | |||
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | |||
[[Category: | </div> | ||
<div class="pdbe-citations 7nc1" style="background-color:#fffaf0;"></div> | |||
== References == | |||
<references/> | |||
__TOC__ | |||
</StructureSection> | |||
[[Category: Aspfc]] | |||
[[Category: Large Structures]] | |||
[[Category: Groll, M]] | |||
[[Category: Huber, E M]] | |||
[[Category: Aspergillus fumigatus]] | |||
[[Category: Biosynthetic protein]] | |||
[[Category: Carbon-sulphur-bond]] | |||
[[Category: Epidithiodioxopiperazine]] | |||
[[Category: Glutathione-s-transferase]] | |||
[[Category: Mycotoxin]] | |||
Latest revision as of 18:00, 17 June 2021
Glutathione-S-transferase GliG with partially disordered active siteGlutathione-S-transferase GliG with partially disordered active site
Structural highlights
Publication Abstract from PubMedGlutathione-S-transferases (GSTs) usually detoxify xenobiotics. The human pathogenic fungus Aspergillus fumigatus however uses the exceptional GST GliG to incorporate two sulphur atoms into its virulence factor gliotoxin. Because these sulphurs are essential for biological activity, glutathionylation is a key step of gliotoxin biosynthesis. Yet, the mechanism of carbon-sulphur linkage formation from a bis-hydroxylated precursor is unresolved. Here, we report structures of GliG with glutathione (GSH) and its reaction product cyclo[-l-Phe-l-Ser]-bis-glutathione, which has been purified from a genetically modified A. fumigatus strain. The structures argue for stepwise processing of first the Phe and second the Ser moiety. Enzyme-mediated dehydration of the substrate activates GSH and a helix dipole stabilizes the resulting anion via a water molecule for the nucleophilic attack. Activity assays with mutants validate the interactions of GliG with the ligands and enrich our knowledge about enzymatic C-S bond formation in gliotoxin and epipolythiodioxopiperazine (ETP) natural compounds in general. Structural and mechanistic insights into C-S bond formation in gliotoxin.,Scherlach K, Kuttenlochner W, Scharf DH, Brakhage AA, Hertweck C, Groll M, Huber E Angew Chem Int Ed Engl. 2021 Apr 28. doi: 10.1002/anie.202104372. PMID:33909314[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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