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| | ==CRYSTAL STRUCTURES OF FERRIC-NO COMPLEXES OF FUNGAL NITRIC OXIDE REDUCTASE AND THEIR SER286 MUTANTS AT CRYOGENIC TEMPERATURE== | | ==CRYSTAL STRUCTURES OF FERRIC-NO COMPLEXES OF FUNGAL NITRIC OXIDE REDUCTASE AND THEIR SER286 MUTANTS AT CRYOGENIC TEMPERATURE== |
| - | <StructureSection load='1cmn' size='340' side='right' caption='[[1cmn]], [[Resolution|resolution]] 1.70Å' scene=''> | + | <StructureSection load='1cmn' size='340' side='right'caption='[[1cmn]], [[Resolution|resolution]] 1.70Å' scene=''> |
| | == Structural highlights == | | == Structural highlights == |
| - | <table><tr><td colspan='2'>[[1cmn]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/Fusox Fusox]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1CMN OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1CMN FirstGlance]. <br> | + | <table><tr><td colspan='2'>[[1cmn]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Fusarium_oxysporum Fusarium oxysporum]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1CMN OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1CMN FirstGlance]. <br> |
| - | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=HEM:PROTOPORPHYRIN+IX+CONTAINING+FE'>HEM</scene>, <scene name='pdbligand=NO:NITRIC+OXIDE'>NO</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]] 1.7Å</td></tr> |
| - | <tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[1cl6|1cl6]], [[1cmj|1cmj]]</td></tr> | + | <tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=HEM:PROTOPORPHYRIN+IX+CONTAINING+FE'>HEM</scene>, <scene name='pdbligand=NO:NITRIC+OXIDE'>NO</scene></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=1cmn FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1cmn OCA], [http://pdbe.org/1cmn PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1cmn RCSB], [http://www.ebi.ac.uk/pdbsum/1cmn PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=1cmn 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=1cmn FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1cmn OCA], [https://pdbe.org/1cmn PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1cmn RCSB], [https://www.ebi.ac.uk/pdbsum/1cmn PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1cmn ProSAT]</span></td></tr> |
| | </table> | | </table> |
| | == Function == | | == Function == |
| - | [[http://www.uniprot.org/uniprot/NOR_FUSOX NOR_FUSOX]] Nitric oxide reductase which is involved in a dissimilatory reduction of nitrite. Acts as a nitric oxide reductase. Is able to reduce nitrate and nitrite to a gaseous form of N(2)O when oxygen supply is limited or discontinued. May function as a detoxification mechanism.<ref>PMID:2040619</ref> <ref>PMID:12105197</ref> | + | [https://www.uniprot.org/uniprot/NOR_FUSOX NOR_FUSOX] Nitric oxide reductase which is involved in a dissimilatory reduction of nitrite. Acts as a nitric oxide reductase. Is able to reduce nitrate and nitrite to a gaseous form of N(2)O when oxygen supply is limited or discontinued. May function as a detoxification mechanism.<ref>PMID:2040619</ref> <ref>PMID:12105197</ref> |
| | == Evolutionary Conservation == | | == Evolutionary Conservation == |
| | [[Image:Consurf_key_small.gif|200px|right]] | | [[Image:Consurf_key_small.gif|200px|right]] |
| | Check<jmol> | | Check<jmol> |
| | <jmolCheckbox> | | <jmolCheckbox> |
| - | <scriptWhenChecked>select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/cm/1cmn_consurf.spt"</scriptWhenChecked> | + | <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/cm/1cmn_consurf.spt"</scriptWhenChecked> |
| | <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked> | | <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked> |
| | <text>to colour the structure by Evolutionary Conservation</text> | | <text>to colour the structure by Evolutionary Conservation</text> |
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| | </div> | | </div> |
| | <div class="pdbe-citations 1cmn" style="background-color:#fffaf0;"></div> | | <div class="pdbe-citations 1cmn" style="background-color:#fffaf0;"></div> |
| | + | |
| | + | ==See Also== |
| | + | *[[Cytochrome P450 3D structures|Cytochrome P450 3D structures]] |
| | == References == | | == References == |
| | <references/> | | <references/> |
| | __TOC__ | | __TOC__ |
| | </StructureSection> | | </StructureSection> |
| - | [[Category: Fusox]] | + | [[Category: Fusarium oxysporum]] |
| - | [[Category: Park, S Y]] | + | [[Category: Large Structures]] |
| - | [[Category: Shiro, Y]] | + | [[Category: Park S-Y]] |
| - | [[Category: Cytochrome p450nor]] | + | [[Category: Shiro Y]] |
| - | [[Category: Nitric oxide reductase]]
| + | |
| - | [[Category: No-liganded]]
| + | |
| - | [[Category: Oxidoreductase]]
| + | |
| Structural highlights
Function
NOR_FUSOX Nitric oxide reductase which is involved in a dissimilatory reduction of nitrite. Acts as a nitric oxide reductase. Is able to reduce nitrate and nitrite to a gaseous form of N(2)O when oxygen supply is limited or discontinued. May function as a detoxification mechanism.[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
Fungal nitric-oxide reductase (NOR) is a heme enzyme that catalyzes the reduction of NO to N(2)O through its ferric-NO complex, the first intermediate of the catalysis. Crystal structures of the ferric-NO forms of wild type (WT) fungal NOR, and of the Ser(286) --> Val and Ser(286) --> Thr mutant enzymes were determined to 1.7-A resolution at cryogenic temperature (100 K). This shows a slightly tilted and bent NO binding to the heme iron, in sharp contrast to the highly bent NO coordination found in ferrous hemoproteins. In the WT structure, a specific hydrogen-bonding network that connects the active site to the solvent was identified, H(2)O(Wat(74))-Ser(286)-H(2)O(Wat(33))-Asp(393)-solvent. Wat(74) is located 3.10 A from the iron-bound NO. Replacement of Ser(286) with Val or Thr scarcely alters the NO coordination structure but expels the water molecules, Wat(74) from the active site. The Asp(393) mutation does not influence the position of Wat(74), but disrupts the hydrogen-bonding network at Wat(33), as evidenced by enzymatic, kinetic, and spectroscopic (resonance Raman and IR) results. The structural changes observed upon the Ser(286) or the Asp(393) mutation are consistent with the dramatic loss of the enzymatic activity for the NO reduction of fungal NOR. We have conclusively identified the water molecule, Wat(74), adjacent to the iron-bound NO as a proton donor to the Fe-NO moiety. In addition, we find the hydrogen-bonding network, H(2)O(Wat(74))-Ser(286)-H(2)O(Wat(33))-Asp(393), as a proton delivery pathway in the NO reduction reaction by fungal NOR.
Proton delivery in NO reduction by fungal nitric-oxide reductase. Cryogenic crystallography, spectroscopy, and kinetics of ferric-NO complexes of wild-type and mutant enzymes.,Shimizu H, Obayashi E, Gomi Y, Arakawa H, Park SY, Nakamura H, Adachi S, Shoun H, Shiro Y J Biol Chem. 2000 Feb 18;275(7):4816-26. PMID:10671516[3]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
See Also
References
- ↑ Shoun H, Tanimoto T. Denitrification by the fungus Fusarium oxysporum and involvement of cytochrome P-450 in the respiratory nitrite reduction. J Biol Chem. 1991 Jun 15;266(17):11078-82. PMID:2040619
- ↑ Zhang L, Kudo T, Takaya N, Shoun H. The B' helix determines cytochrome P450nor specificity for the electron donors NADH and NADPH. J Biol Chem. 2002 Sep 13;277(37):33842-7. Epub 2002 Jul 8. PMID:12105197 doi:http://dx.doi.org/10.1074/jbc.M203923200
- ↑ Shimizu H, Obayashi E, Gomi Y, Arakawa H, Park SY, Nakamura H, Adachi S, Shoun H, Shiro Y. Proton delivery in NO reduction by fungal nitric-oxide reductase. Cryogenic crystallography, spectroscopy, and kinetics of ferric-NO complexes of wild-type and mutant enzymes. J Biol Chem. 2000 Feb 18;275(7):4816-26. PMID:10671516
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