View source for 3a9m


==Crystal structure of a hemoglobin component V from Propsilocerus akamusi (pH9.0 coordinates)==
<StructureSection load='3a9m' size='340' side='right'caption='[[3a9m]], [[Resolution|resolution]] 1.80&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[3a9m]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/Tokunagayusurika_akamusi Tokunagayusurika akamusi]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3A9M OCA]. For a <b>guided tour on the structure components</b> use [http://proteopedia.org/fgij/fg.htm?mol=3A9M 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></td></tr>
<tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[2zwj|2zwj]], [[3a5a|3a5a]], [[3a5b|3a5b]], [[3a5g|3a5g]]</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=3a9m FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3a9m OCA], [http://pdbe.org/3a9m PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=3a9m RCSB], [http://www.ebi.ac.uk/pdbsum/3a9m PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=3a9m ProSAT]</span></td></tr>
</table>
== 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/a9/3a9m_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=3a9m ConSurf].
<div style="clear:both"></div>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Haemoglobin component V (Hb V) from the midge larva Propsilocerus akamusi exhibits oxygen affinity despite the replacement of HisE7 and a pH-dependence of its functional properties. In order to understand the contribution of the distal residue to the ligand-binding properties and the pH-dependent structural changes in this insect Hb, the crystal structure of Hb V was determined under five different pH conditions. Structural comparisons of these Hb structures indicated that at neutral pH ArgE10 contributes to the stabilization of the haem-bound ligand molecule as a functional substitute for the nonpolar E7 residue. However, ArgE10 does not contribute to stabilization at acidic and alkaline pH because of the swinging movement of the Arg side chain under these conditions. This pH-dependent behaviour of Arg results in significant differences in the hydrogen-bond network on the distal side of the haem in the Hb V structures at different pH values. Furthermore, the change in pH results in a partial movement of the F helix, considering that coupled movements of ArgE10 and the F helix determine the haem location at each pH. These results suggested that Hb V retains its functional properties by adapting to the structural changes caused by amino-acid replacements.

pH-dependent structural changes in haemoglobin component V from the midge larva Propsilocerus akamusi (Orthocladiinae, Diptera).,Kuwada T, Hasegawa T, Takagi T, Sato I, Shishikura F Acta Crystallogr D Biol Crystallogr. 2010 Mar;66(Pt 3):258-67. Epub 2010, Feb 12. PMID:20179337<ref>PMID:20179337</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 3a9m" style="background-color:#fffaf0;"></div>

==See Also==
*[[Hemoglobin 3D structures|Hemoglobin 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Tokunagayusurika akamusi]]
[[Category: Hasegawa, T]]
[[Category: Kuwada, T]]
[[Category: Shishikura, F]]
[[Category: Takagi, T]]
[[Category: Diptera]]
[[Category: Heme]]
[[Category: Hemoglobin]]
[[Category: Insect]]
[[Category: Midge larva]]
[[Category: Oxygen transport]]
[[Category: Propsilocerus akamusi]]
[[Category: Transport]]