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| | ==Crystal structure of the H-NOX domain from Nostoc sp. PCC 7120== | | ==Crystal structure of the H-NOX domain from Nostoc sp. PCC 7120== |
| - | <StructureSection load='2o09' size='340' side='right' caption='[[2o09]], [[Resolution|resolution]] 2.10Å' scene=''> | + | <StructureSection load='2o09' size='340' side='right'caption='[[2o09]], [[Resolution|resolution]] 2.10Å' scene=''> |
| | == Structural highlights == | | == Structural highlights == |
| - | <table><tr><td colspan='2'>[[2o09]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/Anabaena_7120 Anabaena 7120]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2O09 OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2O09 FirstGlance]. <br> | + | <table><tr><td colspan='2'>[[2o09]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Nostoc_sp._PCC_7120_=_FACHB-418 Nostoc sp. PCC 7120 = FACHB-418]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2O09 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2O09 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></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]] 2.1Å</td></tr> |
| - | <tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[2o0c|2o0c]], [[2o0g|2o0g]]</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></td></tr> |
| - | <tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">alr2278 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=103690 Anabaena 7120])</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=2o09 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2o09 OCA], [https://pdbe.org/2o09 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2o09 RCSB], [https://www.ebi.ac.uk/pdbsum/2o09 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2o09 ProSAT]</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=2o09 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2o09 OCA], [http://pdbe.org/2o09 PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=2o09 RCSB], [http://www.ebi.ac.uk/pdbsum/2o09 PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=2o09 ProSAT]</span></td></tr> | + | |
| | </table> | | </table> |
| | + | == Function == |
| | + | [https://www.uniprot.org/uniprot/Q8YUQ7_NOSS1 Q8YUQ7_NOSS1] |
| | == 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: Anabaena 7120]] | + | [[Category: Large Structures]] |
| - | [[Category: Akker, F van den]] | + | [[Category: Nostoc sp. PCC 7120 = FACHB-418]] |
| - | [[Category: Ma, X]] | + | [[Category: Ma X]] |
| - | [[Category: Co]] | + | [[Category: Van den Akker F]] |
| - | [[Category: Guanylyl cyclase]]
| + | |
| - | [[Category: Heme]]
| + | |
| - | [[Category: No]]
| + | |
| - | [[Category: Signaling protein]]
| + | |
| Structural highlights
Function
Q8YUQ7_NOSS1
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
Diatomic ligand discrimination by soluble guanylyl cyclase (sGC) is paramount to cardiovascular homeostasis and neuronal signaling. Nitric oxide (NO) stimulates sGC activity 200-fold compared with only four-fold by carbon monoxide (CO). The molecular details of ligand discrimination and differential response to NO and CO are not well understood. These ligands are sensed by the heme domain of sGC, which belongs to the heme nitric oxide oxygen (H-NOX) domain family, also evolutionarily conserved in prokaryotes. Here we report crystal structures of the free, NO-bound, and CO-bound H-NOX domains of a cyanobacterial homolog. These structures and complementary mutational analysis in sGC reveal a molecular ruler mechanism that allows sGC to favor NO over CO while excluding oxygen, concomitant to signaling that exploits differential heme pivoting and heme bending. The heme thereby serves as a flexing wedge, allowing the N-terminal subdomain of H-NOX to shift concurrent with the transition of the six- to five-coordinated NO-bound state upon sGC activation. This transition can be modulated by mutations at sGC residues 74 and 145 and corresponding residues in the cyanobacterial H-NOX homolog.
NO and CO differentially activate soluble guanylyl cyclase via a heme pivot-bend mechanism.,Ma X, Sayed N, Beuve A, van den Akker F EMBO J. 2007 Jan 24;26(2):578-88. Epub 2007 Jan 11. PMID:17215864[1]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
References
- ↑ Ma X, Sayed N, Beuve A, van den Akker F. NO and CO differentially activate soluble guanylyl cyclase via a heme pivot-bend mechanism. EMBO J. 2007 Jan 24;26(2):578-88. Epub 2007 Jan 11. PMID:17215864
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