View source for 5eet


==Crystal structure of murine neuroglobin at ambient pressure==
<StructureSection load='5eet' size='340' side='right' caption='[[5eet]], [[Resolution|resolution]] 2.00&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[5eet]] is a 1 chain structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5EET OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=5EET 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>, <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'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=5eet FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5eet OCA], [http://pdbe.org/5eet PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=5eet RCSB], [http://www.ebi.ac.uk/pdbsum/5eet PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=5eet ProSAT]</span></td></tr>
</table>
== Function ==
[[http://www.uniprot.org/uniprot/NGB_MOUSE NGB_MOUSE]] Involved in oxygen transport in the brain. Hexacoordinate globin, displaying competitive binding of oxygen or the distal His residue to the iron atom. Not capable of penetrating cell membranes. The deoxygenated form exhibits nitrite reductase activity inhibiting cellular respiration via NO-binding to cytochrome c oxidase. Involved in neuroprotection during oxidative stress. May exert its anti-apoptotic activity by acting to reset the trigger level of mitochondrial cytochrome c release necessary to commit the cells to apoptosis.<ref>PMID:11473111</ref> <ref>PMID:11473128</ref>  
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Investigating the effect of pressure sheds light on the dynamics and plasticity of proteins, intrinsically correlated to functional efficiency. Here we detail the structural response to pressure of neuroglobin (Ngb), a hexacoordinate globin likely to be involved in neuroprotection. In murine Ngb, reversible coordination is achieved by repositioning the heme more deeply into a large internal cavity, the "heme sliding mechanism". Combining high pressure crystallography and coarse-grain simulations on wild type Ngb as well as two mutants, one (V101F) with unaffected and another (F106W) with decreased affinity for CO, we show that Ngb hinges around a rigid mechanical nucleus of five hydrophobic residues (V68, I72, V109, L113, Y137) during its conformational transition induced by gaseous ligand, that the intrinsic flexibility of the F-G loop appears essential to drive the heme sliding mechanism, and that residue Val 101 may act as a sensor of the interaction disruption between the heme and the distal histidine.

Determinants of neuroglobin plasticity highlighted by joint coarse-grained simulations and high pressure crystallography.,Colloc'h N, Sacquin-Mora S, Avella G, Dhaussy AC, Prange T, Vallone B, Girard E Sci Rep. 2017 May 12;7(1):1858. doi: 10.1038/s41598-017-02097-1. PMID:28500341<ref>PMID:28500341</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 5eet" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Girard, E]]
[[Category: Vallone, B]]
[[Category: H, N Colloc]]
[[Category: Globin]]
[[Category: Oxygen storage-transporter]]
[[Category: Transport protein]]