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2ekt

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Revision as of 14:10, 10 September 2015

Crystal structure of myoglobin reconstituted with 6-methyl-6-depropionatehemin

Structural highlights

2ekt is a 1 chain structure with sequence from Physeter catodon. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Ligands:	,
Related:	2eku
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, TOPSAN

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

Two heme propionate side chains, which are attached at the 6 and 7 positions of the heme framework, are linked with Arg45 and Ser92, respectively, in sperm whale myoglobin. To evaluate the role of each propionate, two kinds of one-legged hemins, 6-depropionated and 7-depropionated protohemins, were prepared and inserted into the apomyoglobin to yield two reconstituted proteins. Structural data of the reconstituted myoglobins were obtained via an X-ray crystallographic analysis at a resolution of 1.1-1.4 A and resonance Raman spectroscopy. It was found that the lack of the 6-propionate reduces the number of hydrogen bonds in the distal site and clearly changes the position of the Arg45 residue with the disrupting Arg45-Asp60 interaction. In contrast, the removal of the 7-propionate does not cause a significant structural change in the residues of the distal and proximal sites. However, the resonance Raman studies suggested that the coordination bond strength of the His93-Fe bond for the protein with the 7-depropionated protoheme slightly increases compared to that for the protein with the native heme. The O2 and CO ligand binding studies for the reconstituted proteins with the one-legged hemes provide an important insight into the functional role of each propionate. The lack of the 6-propionate accelerates the O2 dissociation by ca. 3-fold compared to those of the other reconstituted and native proteins. The lack of the 7-propionate enhances the CO affinity by 2-fold compared to that of the protein with the native heme. These results indicate that the 6-propionate clearly contributes to the stabilization of the bound O2, whereas the 7-propionate plays an important role in the regulation of the Fe-His bond.

Structure and ligand binding properties of myoglobins reconstituted with monodepropionated heme: functional role of each heme propionate side chain.,Harada K, Makino M, Sugimoto H, Hirota S, Matsuo T, Shiro Y, Hisaeda Y, Hayashi T Biochemistry. 2007 Aug 21;46(33):9406-16. Epub 2007 Jul 18. PMID:17636874^[1]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

References

↑ Harada K, Makino M, Sugimoto H, Hirota S, Matsuo T, Shiro Y, Hisaeda Y, Hayashi T. Structure and ligand binding properties of myoglobins reconstituted with monodepropionated heme: functional role of each heme propionate side chain. Biochemistry. 2007 Aug 21;46(33):9406-16. Epub 2007 Jul 18. PMID:17636874 doi:10.1021/bi7007068

1 Structural highlights
2 Function
3 Evolutionary Conservation
4 Publication Abstract from PubMed
5 See Also
6 References

Proteopedia Page Contributors and Editors (what is this?)

OCA

Retrieved from "http://52.214.119.220/wiki/index.php/2ekt"

@@ Line 5: / Line 5: @@
 </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=6HE:6-METHY-6-DEPROPIONATEHEMIN'>6HE</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene></td></tr>
 <tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[2eku|2eku]]</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=2ekt FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2ekt OCA], [http://www.rcsb.org/pdb/explore.do?structureId=2ekt RCSB], [http://www.ebi.ac.uk/pdbsum/2ekt PDBsum], [http://www.topsan.org/Proteins/RSGI/2ekt TOPSAN]</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=2ekt FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2ekt OCA], [http://pdbe.org/2ekt PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=2ekt RCSB], [http://www.ebi.ac.uk/pdbsum/2ekt PDBsum], [http://www.topsan.org/Proteins/RSGI/2ekt TOPSAN]</span></td></tr>
 </table>
 == Function ==
-[[http://www.uniprot.org/uniprot/MYG_PHYCA MYG_PHYCA]] Serves as a reserve supply of oxygen and facilitates the movement of oxygen within muscles.
+[[http://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 ==
 [[Image:Consurf_key_small.gif|200px|right]]
@@ Line 27: / Line 27: @@
 From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
 </div>
+<div class="pdbe-citations 2ekt" style="background-color:#fffaf0;"></div>
 ==See Also==

2ekt

From Proteopedia

Revision as of 14:10, 10 September 2015

Crystal structure of myoglobin reconstituted with 6-methyl-6-depropionatehemin

Structural highlights

Function

Evolutionary Conservation

Publication Abstract from PubMed

See Also

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

Views

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