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| | <StructureSection load='1zj8' size='340' side='right'caption='[[1zj8]], [[Resolution|resolution]] 2.80Å' scene=''> | | <StructureSection load='1zj8' size='340' side='right'caption='[[1zj8]], [[Resolution|resolution]] 2.80Å' scene=''> |
| | == Structural highlights == | | == Structural highlights == |
| - | <table><tr><td colspan='2'>[[1zj8]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/Myctu Myctu]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1ZJ8 OCA]. For a <b>guided tour on the structure components</b> use [http://proteopedia.org/fgij/fg.htm?mol=1ZJ8 FirstGlance]. <br> | + | <table><tr><td colspan='2'>[[1zj8]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Mycobacterium_tuberculosis_H37Rv Mycobacterium tuberculosis H37Rv]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1ZJ8 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1ZJ8 FirstGlance]. <br> |
| - | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CL:CHLORIDE+ION'>CL</scene>, <scene name='pdbligand=SF4:IRON/SULFUR+CLUSTER'>SF4</scene>, <scene name='pdbligand=SRM:SIROHEME'>SRM</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]] 2.8Å</td></tr> |
| - | <tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat"><div style='overflow: auto; max-height: 3em;'>[[1zj9|1zj9]]</div></td></tr>
| + | <tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CL:CHLORIDE+ION'>CL</scene>, <scene name='pdbligand=SF4:IRON/SULFUR+CLUSTER'>SF4</scene>, <scene name='pdbligand=SRM:SIROHEME'>SRM</scene></td></tr> |
| - | <tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">NIRA ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=83332 MYCTU])</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=1zj8 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1zj8 OCA], [https://pdbe.org/1zj8 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1zj8 RCSB], [https://www.ebi.ac.uk/pdbsum/1zj8 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1zj8 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/Ferredoxin--nitrite_reductase Ferredoxin--nitrite reductase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=1.7.7.1 1.7.7.1] </span></td></tr> | + | |
| - | <tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://proteopedia.org/fgij/fg.htm?mol=1zj8 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1zj8 OCA], [http://pdbe.org/1zj8 PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1zj8 RCSB], [http://www.ebi.ac.uk/pdbsum/1zj8 PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=1zj8 ProSAT]</span></td></tr> | + | |
| | </table> | | </table> |
| | + | == Function == |
| | + | [https://www.uniprot.org/uniprot/SIR_MYCTU SIR_MYCTU] |
| | == 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: Ferredoxin--nitrite reductase]] | |
| | [[Category: Large Structures]] | | [[Category: Large Structures]] |
| - | [[Category: Myctu]] | + | [[Category: Mycobacterium tuberculosis H37Rv]] |
| - | [[Category: Hellman, U]] | + | [[Category: Hellman U]] |
| - | [[Category: Lindqvist, Y]] | + | [[Category: Lindqvist Y]] |
| - | [[Category: SPINE, Structural Proteomics in Europe]]
| + | [[Category: Sandalova T]] |
| - | [[Category: Sandalova, T]] | + | [[Category: Schneider G]] |
| - | [[Category: Schneider, G]] | + | [[Category: Schnell R]] |
| - | [[Category: Schnell, R]] | + | |
| - | [[Category: Cys-tyr covalent bond]]
| + | |
| - | [[Category: Fe4-s4]]
| + | |
| - | [[Category: Nira]]
| + | |
| - | [[Category: Nitrite]]
| + | |
| - | [[Category: Oxidoreductase]]
| + | |
| - | [[Category: Reductase]]
| + | |
| - | [[Category: Siroheme]]
| + | |
| - | [[Category: Spine]]
| + | |
| - | [[Category: Structural genomic]]
| + | |
| - | [[Category: Structural proteomics in europe]]
| + | |
| - | [[Category: Sulfite]]
| + | |
| Structural highlights
Function
SIR_MYCTU
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 nirA gene of Mycobacterium tuberculosis is up-regulated in the persistent state of the bacteria, suggesting that it is a potential target for the development of antituberculosis agents particularly active against the pathogen in its dormant phase. This gene encodes a ferredoxin-dependent sulfite reductase, and the structure of the enzyme has been determined using x-ray crystallography. The enzyme is a monomer comprising 555 amino acids and contains a [Fe4-S4] cluster and a siroheme cofactor. The molecule is built up of three domains with an alpha/beta fold. The first domain consists of two ferredoxin-like subdomains, related by a pseudo-2-fold symmetry axis passing through the whole molecule. The other two domains, which provide much of the binding interactions with the cofactors, have a common fold that is unique to the sulfite/nitrite reductase family. The domains form a trilobal structure, with the cofactors and the active site located at the interface of all three domains in the center of the molecule. NirA contains an unusual covalent bond between the side chains of Tyr69 and Cys161 in the active site, in close proximity to the siroheme cofactor. Removal of this covalent bond by site-directed mutagenesis impairs catalytic activity, suggesting that it is important for the enzymatic reaction. These residues are part of a sequence fingerprint, able to distinguish between ferredoxin-dependent sulfite and nitrite reductases. Comparison of NirA with the structure of the truncated NADPH-dependent sulfite reductase from Escherichia coli suggests a binding site for the external electron donor ferredoxin close to the [Fe4-S4] cluster.
Siroheme- and [Fe4-S4]-dependent NirA from Mycobacterium tuberculosis is a sulfite reductase with a covalent Cys-Tyr bond in the active site.,Schnell R, Sandalova T, Hellman U, Lindqvist Y, Schneider G J Biol Chem. 2005 Jul 22;280(29):27319-28. Epub 2005 May 24. PMID:15917234[1]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
References
- ↑ Schnell R, Sandalova T, Hellman U, Lindqvist Y, Schneider G. Siroheme- and [Fe4-S4]-dependent NirA from Mycobacterium tuberculosis is a sulfite reductase with a covalent Cys-Tyr bond in the active site. J Biol Chem. 2005 Jul 22;280(29):27319-28. Epub 2005 May 24. PMID:15917234 doi:10.1074/jbc.M502560200
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