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| | ==The Structures of Thiolate- and Carboxylate-Ligated Ferric H93G Myoglobin: Models for Cytochrome P450 and for Oxyanion-Bound Heme Proteins== | | ==The Structures of Thiolate- and Carboxylate-Ligated Ferric H93G Myoglobin: Models for Cytochrome P450 and for Oxyanion-Bound Heme Proteins== |
| - | <StructureSection load='2evp' size='340' side='right' caption='[[2evp]], [[Resolution|resolution]] 1.70Å' scene=''> | + | <StructureSection load='2evp' size='340' side='right'caption='[[2evp]], [[Resolution|resolution]] 1.70Å' scene=''> |
| | == Structural highlights == | | == Structural highlights == |
| - | <table><tr><td colspan='2'>[[2evp]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/Phycd Phycd]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2EVP OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2EVP FirstGlance]. <br> | + | <table><tr><td colspan='2'>[[2evp]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Physeter_catodon Physeter catodon]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2EVP OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2EVP FirstGlance]. <br> |
| - | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=BME:BETA-MERCAPTOETHANOL'>BME</scene>, <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]] 1.7Å</td></tr> |
| - | <tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[1a6k|1a6k]], [[1dtm|1dtm]], [[2evk|2evk]]</td></tr> | + | <tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=BME:BETA-MERCAPTOETHANOL'>BME</scene>, <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">MB ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=9755 PHYCD])</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=2evp FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2evp OCA], [https://pdbe.org/2evp PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2evp RCSB], [https://www.ebi.ac.uk/pdbsum/2evp PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2evp 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=2evp FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2evp OCA], [http://pdbe.org/2evp PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=2evp RCSB], [http://www.ebi.ac.uk/pdbsum/2evp PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=2evp ProSAT]</span></td></tr> | + | |
| | </table> | | </table> |
| | == Function == | | == Function == |
| - | [[http://www.uniprot.org/uniprot/MYG_PHYMC MYG_PHYMC]] Serves as a reserve supply of oxygen and facilitates the movement of oxygen within muscles. | + | [https://www.uniprot.org/uniprot/MYG_PHYMC MYG_PHYMC] Serves as a reserve supply of oxygen and facilitates the movement of oxygen within muscles. |
| | == Evolutionary Conservation == | | == Evolutionary Conservation == |
| | [[Image:Consurf_key_small.gif|200px|right]] | | [[Image:Consurf_key_small.gif|200px|right]] |
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| | ==See Also== | | ==See Also== |
| - | *[[Myoglobin|Myoglobin]] | + | *[[Myoglobin 3D structures|Myoglobin 3D structures]] |
| | == References == | | == References == |
| | <references/> | | <references/> |
| | __TOC__ | | __TOC__ |
| | </StructureSection> | | </StructureSection> |
| - | [[Category: Phycd]] | + | [[Category: Large Structures]] |
| - | [[Category: Dawson, J H]] | + | [[Category: Physeter catodon]] |
| - | [[Category: Lebioda, L]] | + | [[Category: Dawson JH]] |
| - | [[Category: Lovelace, L L]] | + | [[Category: Lebioda L]] |
| - | [[Category: Perera, R]] | + | [[Category: Lovelace LL]] |
| - | [[Category: Qin, J]] | + | [[Category: Perera R]] |
| - | [[Category: Bme]]
| + | [[Category: Qin J]] |
| - | [[Category: H93g]]
| + | |
| - | [[Category: Oxygen storage-transport complex]]
| + | |
| Structural highlights
Function
MYG_PHYMC Serves as a reserve supply of oxygen and facilitates the movement of oxygen within muscles.
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
Crystal structures of the ferric H93G myoglobin (Mb) cavity mutant containing either an anionic proximal thiolate sulfur donor or a carboxylate oxygen donor ligand are reported at 1.7 and 1.4 A resolution, respectively. The crystal structure and magnetic circular dichroism spectra of the H93G Mb beta-mercaptoethanol (BME) thiolate adduct reveal a high-spin, five-coordinate complex. Furthermore, the bound BME appears to have an intramolecular hydrogen bond involving the alcohol proton and the ligated thiolate sulfur, mimicking one of the three proximal N-H...S hydrogen bonds in cytochrome P450. The Fe is displaced from the porphyrin plane by 0.5 A and forms a 2.41 A Fe-S bond. The Fe(3+)-S-C angle is 111 degrees , indicative of a covalent Fe-S bond with sp(3)-hybridized sulfur. Therefore, the H93G Mb.BME complex provides an excellent protein-derived structural model for high-spin ferric P450. In particular, the Fe-S bond in high-spin ferric P450-CAM has essentially the same geometry despite the constraints imposed by covalent linkage of the cysteine to the protein backbone. This suggests that evolution led to the geometric optimization of the proximal Fe-S(cysteinate) bond in P450. The crystal structure and spectral properties of the H93G Mb acetate adduct reveal a high-spin, six-coordinate complex with proximal acetate and distal water axial ligands. The distal His-64 forms a hydrogen bond with the bound water. The Fe-acetate bonding geometry is inconsistent with an electron pair along the Fe-O bond as the Fe-O-C angle is 152 degrees and the Fe is far from the plane of the acetate. Thus, the Fe-O bonding is ionic. The H93G Mb cavity mutant has already been shown to be a versatile model system for the study of ligand binding to heme proteins; this investigation affords the first structural evidence that nonimidazole exogenous ligands bind in the proximal ligation site.
Structures of thiolate- and carboxylate-ligated ferric H93G myoglobin: models for cytochrome P450 and for oxyanion-bound heme proteins.,Qin J, Perera R, Lovelace LL, Dawson JH, Lebioda L Biochemistry. 2006 Mar 14;45(10):3170-7. PMID:16519512[1]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
See Also
References
- ↑ Qin J, Perera R, Lovelace LL, Dawson JH, Lebioda L. Structures of thiolate- and carboxylate-ligated ferric H93G myoglobin: models for cytochrome P450 and for oxyanion-bound heme proteins. Biochemistry. 2006 Mar 14;45(10):3170-7. PMID:16519512 doi:10.1021/bi052171s
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