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1w92

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Revision as of 07:17, 4 April 2018

The structure of carbomonoxy murine neuroglobin reveals a heme- sliding mechanism for affinity regulation

Structural highlights

1w92 is a 1 chain structure with sequence from Lk3 transgenic mice. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Ligands:	,
Related:	1q1f
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

[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.^[1] ^[2]

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

Neuroglobin (Ngb), a globular heme protein expressed in the brain of vertebrates, binds oxygen reversibly, with an affinity comparable to myoglobin (Mb). Despite low sequence identity, the overall 3D fold of Ngb and Mb is very similar. Unlike in Mb, in Ngb the sixth coordination position of the heme iron is occupied by the distal histidine, in the absence of an exogenous ligand. Endogenous ligation has been proposed as a unique mechanism for affinity regulation and ligand discrimination in heme proteins. This peculiarity might be related to the still-unknown physiological function of Ngb. Here, we present the x-ray structure of CO-bound ferrous murine Ngb at 1.7 A and a comparison with the 1.5-A structure of ferric bis-histidine Ngb. We have also used Fourier transform IR spectroscopy of WT and mutant CO-ligated Ngb to examine structural heterogeneity in the active site. Upon CO binding, the distal histidine retains (by and large) its position, whereas the heme group slides deeper into a preformed crevice, thereby reshaping the large cavity ( approximately 290 A(3)) connecting the distal and proximal heme sides with the bulk. The heme relocation is accompanied by a significant decrease of structural disorder, especially of the EF loop, which may be the signal whereby Ngb communicates hypoxic conditions. This unexpected structural change unveils a heme-sliding mechanism of affinity control that may be of significance to understanding Ngb's role in the pathophysiology of the brain.

The structure of carbonmonoxy neuroglobin reveals a heme-sliding mechanism for control of ligand affinity.,Vallone B, Nienhaus K, Matthes A, Brunori M, Nienhaus GU Proc Natl Acad Sci U S A. 2004 Dec 14;101(50):17351-6. Epub 2004 Nov 17. PMID:15548613^[3]

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

References

↑ Couture M, Burmester T, Hankeln T, Rousseau DL. The heme environment of mouse neuroglobin. Evidence for the presence of two conformations of the heme pocket. J Biol Chem. 2001 Sep 28;276(39):36377-82. Epub 2001 Jul 25. PMID:11473111 doi:http://dx.doi.org/10.1074/jbc.M103907200
↑ Dewilde S, Kiger L, Burmester T, Hankeln T, Baudin-Creuza V, Aerts T, Marden MC, Caubergs R, Moens L. Biochemical characterization and ligand binding properties of neuroglobin, a novel member of the globin family. J Biol Chem. 2001 Oct 19;276(42):38949-55. Epub 2001 Jul 25. PMID:11473128 doi:http://dx.doi.org/10.1074/jbc.M106438200
↑ Vallone B, Nienhaus K, Matthes A, Brunori M, Nienhaus GU. The structure of carbonmonoxy neuroglobin reveals a heme-sliding mechanism for control of ligand affinity. Proc Natl Acad Sci U S A. 2004 Dec 14;101(50):17351-6. Epub 2004 Nov 17. PMID:15548613

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/1w92"

@@ Line 1: / Line 1: @@
 ==The structure of carbomonoxy murine neuroglobin reveals a heme- sliding mechanism for affinity regulation==
 <StructureSection load='1w92' size='340' side='right' caption='[[1w92]], [[Resolution|resolution]] 1.70&Aring;' scene=''>
@@ Line 5: / Line 6: @@
 </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><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">[[1q1f|1q1f]]</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=1w92 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1w92 OCA], [http://pdbe.org/1w92 PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1w92 RCSB], [http://www.ebi.ac.uk/pdbsum/1w92 PDBsum]</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=1w92 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1w92 OCA], [http://pdbe.org/1w92 PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1w92 RCSB], [http://www.ebi.ac.uk/pdbsum/1w92 PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=1w92 ProSAT]</span></td></tr>
 </table>
 == Function ==
@@ Line 13: / Line 14: @@
 Check<jmol>
   <jmolCheckbox>
-    <scriptWhenChecked>select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/w9/1w92_consurf.spt"</scriptWhenChecked>
+    <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/w9/1w92_consurf.spt"</scriptWhenChecked>
     <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
     <text>to colour the structure by Evolutionary Conservation</text>

1w92

From Proteopedia

Revision as of 07:17, 4 April 2018

The structure of carbomonoxy murine neuroglobin reveals a heme- sliding mechanism for affinity regulation

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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