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| | ==ZN INHIBITED SULFUR OXYGENASE REDUCTASE== | | ==ZN INHIBITED SULFUR OXYGENASE REDUCTASE== |
| - | <StructureSection load='2yav' size='340' side='right' caption='[[2yav]], [[Resolution|resolution]] 1.70Å' scene=''> | + | <StructureSection load='2yav' size='340' side='right'caption='[[2yav]], [[Resolution|resolution]] 1.70Å' scene=''> |
| | == Structural highlights == | | == Structural highlights == |
| - | <table><tr><td colspan='2'>[[2yav]] is a 6 chain structure with sequence from [http://en.wikipedia.org/wiki/Acidianus_ambivalens Acidianus ambivalens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2YAV OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2YAV FirstGlance]. <br> | + | <table><tr><td colspan='2'>[[2yav]] is a 6 chain structure with sequence from [https://en.wikipedia.org/wiki/Acidianus_ambivalens Acidianus ambivalens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2YAV OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2YAV FirstGlance]. <br> |
| - | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=ACT:ACETATE+ION'>ACT</scene>, <scene name='pdbligand=CL:CHLORIDE+ION'>CL</scene>, <scene name='pdbligand=FE:FE+(III)+ION'>FE</scene>, <scene name='pdbligand=ZN:ZINC+ION'>ZN</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]] 1.701Å</td></tr> |
| - | <tr id='NonStdRes'><td class="sblockLbl"><b>[[Non-Standard_Residue|NonStd Res:]]</b></td><td class="sblockDat"><scene name='pdbligand=CSS:S-MERCAPTOCYSTEINE'>CSS</scene></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>, <scene name='pdbligand=CL:CHLORIDE+ION'>CL</scene>, <scene name='pdbligand=CSS:S-MERCAPTOCYSTEINE'>CSS</scene>, <scene name='pdbligand=FE:FE+(III)+ION'>FE</scene>, <scene name='pdbligand=ZN:ZINC+ION'>ZN</scene></td></tr> |
| - | <tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[2cb2|2cb2]], [[2y9x|2y9x]], [[2y9w|2y9w]], [[2yaw|2yaw]], [[2yax|2yax]]</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=2yav FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2yav OCA], [https://pdbe.org/2yav PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2yav RCSB], [https://www.ebi.ac.uk/pdbsum/2yav PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2yav ProSAT]</span></td></tr> |
| - | <tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Sulfur_oxygenase/reductase Sulfur oxygenase/reductase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=1.13.11.55 1.13.11.55] </span></td></tr>
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| - | <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=2yav FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2yav OCA], [http://www.rcsb.org/pdb/explore.do?structureId=2yav RCSB], [http://www.ebi.ac.uk/pdbsum/2yav PDBsum]</span></td></tr> | + | |
| | </table> | | </table> |
| | == Function == | | == Function == |
| - | [[http://www.uniprot.org/uniprot/SOR_ACIAM SOR_ACIAM]] Catalyzes the simultaneous oxidation and reduction of elemental sulfur in the presence of oxygen, with sulfite and hydrogen sulfide as products.<ref>PMID:15030315</ref> | + | [https://www.uniprot.org/uniprot/SOR_ACIAM SOR_ACIAM] Catalyzes the simultaneous oxidation and reduction of elemental sulfur in the presence of oxygen, with sulfite and hydrogen sulfide as products.<ref>PMID:15030315</ref> |
| | <div style="background-color:#fffaf0;"> | | <div style="background-color:#fffaf0;"> |
| | == Publication Abstract from PubMed == | | == Publication Abstract from PubMed == |
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| | From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | | From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> |
| | </div> | | </div> |
| | + | <div class="pdbe-citations 2yav" style="background-color:#fffaf0;"></div> |
| | == References == | | == References == |
| | <references/> | | <references/> |
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| | </StructureSection> | | </StructureSection> |
| | [[Category: Acidianus ambivalens]] | | [[Category: Acidianus ambivalens]] |
| - | [[Category: Sulfur oxygenase/reductase]] | + | [[Category: Large Structures]] |
| - | [[Category: Frazao, C]] | + | [[Category: Frazao C]] |
| - | [[Category: Kletzin, A]] | + | [[Category: Kletzin A]] |
| - | [[Category: Protze, J]] | + | [[Category: Protze J]] |
| - | [[Category: Seyfarth, K]] | + | [[Category: Seyfarth K]] |
| - | [[Category: Urich, T]] | + | [[Category: Urich T]] |
| - | [[Category: Veith, A]] | + | [[Category: Veith A]] |
| - | [[Category: Biogeochemical sulfur cycle]]
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| - | [[Category: Cysteine persulphide]]
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| - | [[Category: Icosatetramer]]
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| - | [[Category: Mononuclear non- heme iron]]
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| - | [[Category: Oxidoreductase]]
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| - | [[Category: Thermophilic]]
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| Structural highlights
2yav is a 6 chain structure with sequence from Acidianus ambivalens. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
| | Method: | X-ray diffraction, Resolution 1.701Å |
| Ligands: | , , , , |
| Resources: | FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT |
Function
SOR_ACIAM Catalyzes the simultaneous oxidation and reduction of elemental sulfur in the presence of oxygen, with sulfite and hydrogen sulfide as products.[1]
Publication Abstract from PubMed
Background: The sulfur oxygenase reductase (SOR) is the initial enzyme of the sulfur oxidation pathway in the thermoacidophilic Archaeon Acidianus ambivalens. The SOR catalyzes an oxygen-dependent sulfur disproportionation to H(2)S, sulfite and thiosulfate. The spherical, hollow, cytoplasmic enzyme is composed of 24 identical subunits with an active site pocket each comprising a mononuclear non-heme iron site and a cysteine persulfide. Substrate access and product exit occur via apolar chimney-like protrusions at the fourfold symmetry axes, via narrow polar pores at the threefold symmetry axes and via narrow apolar pores within in each subunit. In order to investigate the function of the pores we performed site-directed mutagenesis and inhibitor studies. Results: Truncation of the chimney-like protrusions resulted in an up to sevenfold increase in specific enzyme activity compared to the wild type. Replacement of the salt bridge-forming Arg(99) residue by Ala at the threefold symmetry axes doubled the activity and introduced a bias toward reduced reaction products. Replacement of Met(296) and Met(297), which form the active site pore, lowered the specific activities by 25-55% with the exception of an M(296)V mutant. X-ray crystallography of SOR wild type crystals soaked with inhibitors showed that Hg(2+) and iodoacetamide (IAA) bind to cysteines within the active site, whereas Zn(2+) binds to a histidine in a side channel of the enzyme. The Zn(2+) inhibition was partially alleviated by mutation of the His residue. Conclusions: The expansion of the pores in the outer shell led to an increased enzyme activity while the integrity of the active site pore seems to be important. Hg(2+) and IAA block cysteines in the active site pocket, while Zn(2+) interferes over a distance, possibly by restriction of protein flexibility or substrate access or product exit.
Substrate pathways and mechanisms of inhibition in the sulfur oxygenase reductase of acidianus ambivalens.,Veith A, Urich T, Seyfarth K, Protze J, Frazao C, Kletzin A Front Microbiol. 2011;2:37. Epub 2011 Mar 7. PMID:21747782[2]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
References
- ↑ Urich T, Bandeiras TM, Leal SS, Rachel R, Albrecht T, Zimmermann P, Scholz C, Teixeira M, Gomes CM, Kletzin A. The sulphur oxygenase reductase from Acidianus ambivalens is a multimeric protein containing a low-potential mononuclear non-haem iron centre. Biochem J. 2004 Jul 1;381(Pt 1):137-46. PMID:15030315 doi:http://dx.doi.org/10.1042/BJ20040003
- ↑ Veith A, Urich T, Seyfarth K, Protze J, Frazao C, Kletzin A. Substrate pathways and mechanisms of inhibition in the sulfur oxygenase reductase of acidianus ambivalens. Front Microbiol. 2011;2:37. Epub 2011 Mar 7. PMID:21747782 doi:http://dx.doi.org/10.3389/fmicb.2011.00037
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