View source for 1mbc


==X-RAY STRUCTURE AND REFINEMENT OF CARBON-MONOXY (FE II)-MYOGLOBIN AT 1.5 ANGSTROMS RESOLUTION==
<StructureSection load='1mbc' size='340' side='right'caption='[[1mbc]], [[Resolution|resolution]] 1.50&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[1mbc]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Phycd Phycd]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1MBC OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1MBC FirstGlance]. <br>
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CMO:CARBON+MONOXIDE'>CMO</scene>, <scene name='pdbligand=HEM:PROTOPORPHYRIN+IX+CONTAINING+FE'>HEM</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene></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=1mbc FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1mbc OCA], [https://pdbe.org/1mbc PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1mbc RCSB], [https://www.ebi.ac.uk/pdbsum/1mbc PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1mbc ProSAT]</span></td></tr>
</table>
== Function ==
[[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 ==
[[Image:Consurf_key_small.gif|200px|right]]
Check<jmol>
  <jmolCheckbox>
    <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/mb/1mbc_consurf.spt"</scriptWhenChecked>
    <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
    <text>to colour the structure by Evolutionary Conservation</text>
  </jmolCheckbox>
</jmol>, as determined by [http://consurfdb.tau.ac.il/ ConSurfDB]. You may read the [[Conservation%2C_Evolutionary|explanation]] of the method and the full data available from [http://bental.tau.ac.il/new_ConSurfDB/main_output.php?pdb_ID=1mbc ConSurf].
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== Publication Abstract from PubMed ==
The structure of carbon-monoxy (Fe II) myoglobin at 260 K has been solved at a resolution of 1.5 A by X-ray diffraction and a model refined against the X-ray data by restrained least-squares. The CO ligand is disordered and distorted from the linear conformation seen in model compounds. At least two conformations, with Fe--C--O angles of 140 degrees and 120 degrees, are required to model the system. The heme pocket is significantly larger than in deoxy-myoglobin because the distal residues have relaxed around the ligand; the largest displacement occurs for the distal histidine side-chain, which moves more than 1.4 A on ligand binding. The side-chain of Arg45 (CD3) is disordered and apparently exists in two equally populated conformations. One of these does not block the motion of the distal histidine out of the binding pocket, suggesting a mechanism for ligand entry. The heme group is planar (root-mean-square deviation from planarity is 0.08 A) with no doming of the pyrrole groups. The Fe--N epsilon 2 (His93) bond length is 2.2 A and the Fe--C bond length in the CO complex is 1.9 A. The iron is the least-squares plane of the heme, and this leads to the proximal histidine moving by 0.4 A relative to its position in deoxy-myoglobin. This shift correlates with a global structural change, with the proximal part of the molecule translated towards the heme plane.

X-ray structure and refinement of carbon-monoxy (Fe II)-myoglobin at 1.5 A resolution.,Kuriyan J, Wilz S, Karplus M, Petsko GA J Mol Biol. 1986 Nov 5;192(1):133-54. PMID:3820301<ref>PMID:3820301</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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<div class="pdbe-citations 1mbc" style="background-color:#fffaf0;"></div>

==See Also==
*[[Myoglobin 3D structures|Myoglobin 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Phycd]]
[[Category: Kuriyan, J]]
[[Category: Petsko, G A]]
[[Category: Oxygen storage]]