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1hbh

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Revision as of 08:52, 10 January 2018

STRUCTURE OF DEOXYHAEMOGLOBIN OF THE ANTARCTIC FISH PAGOTHENIA BERNACCHII AND STRUCTURAL BASIS OF THE ROOT EFFECT

Structural highlights

1hbh is a 4 chain structure with sequence from Emerald rockcod. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Ligands:
NonStd Res:
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

[HBA_TREBE] Involved in oxygen transport from gills to the various peripheral tissues. [HBB_TREBE] Involved in oxygen transport from gills to the various peripheral tissues.

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

We have determined the structure of deoxyhaemoglobin from the antarctic fish Pagothenia bernacchii at pH 6.2 to a resolution of 2.2 A with X-ray data from a twinned crystal deconvoluted so as to approximate data from a single crystal. The R-factor between the (twinned) model and the observed data is 16% for reflections used in refinement and 22% for reflections not used in refinement. The T (deoxy) structure was compared with the R (liganded) structure at pH 8.0 in an attempt to understand the structural basis of the greater affinity for hydrogen ions of T, relative to R, that comprises the Root effect. Up to half of the effect can be attributed to interaction of the residues Asp95 (G1)alpha and Asp101 (G3)beta: in R the residues are far apart and their carboxyl groups are unprotonated, but the shift at the alpha 1 beta 2 interface that accompanies the R to T transition brings them so close that they appear to share a proton between them. The proximity of Asp99 (G1)beta may contribute to the required raising of the pKa values of the other two Asp residues. These and neighbouring residues are sufficiently conserved in the haemoglobins of trout (component IV), carp and bluefin tuna, all of which exhibit the Root effect, for the same mechanism to apply. However, the environment is equally conserved in haemoglobins of Trematomus newnesi (major component) and trout (component I), which do not exhibit the Root effect, so that the structural factors controlling the Asp-Asp interaction remain unclear. No other residue appears to undergo an R to T change in the immediate neighbourhoods that could account for any significant portion of the Root effect, so at least half of the effect must result either from long-range electrostatic interactions or from a large number of local interactions.

Structure of deoxyhaemoglobin of the antarctic fish Pagothenia bernacchii with an analysis of the structural basis of the root effect by comparison of the liganded and unliganded haemoglobin structures.,Ito N, Komiyama NH, Fermi G J Mol Biol. 1995 Jul 28;250(5):648-58. PMID:7623382^[1]

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

References

↑ Ito N, Komiyama NH, Fermi G. Structure of deoxyhaemoglobin of the antarctic fish Pagothenia bernacchii with an analysis of the structural basis of the root effect by comparison of the liganded and unliganded haemoglobin structures. J Mol Biol. 1995 Jul 28;250(5):648-58. PMID:7623382 doi:http://dx.doi.org/10.1006/jmbi.1995.0405

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/1hbh"

Categories: Emerald rockcod | Fermi, G | Ito, N | Komiyama, N H | Oxygen carrier

@@ Line 1: / Line 1: @@
 ==STRUCTURE OF DEOXYHAEMOGLOBIN OF THE ANTARCTIC FISH PAGOTHENIA BERNACCHII AND STRUCTURAL BASIS OF THE ROOT EFFECT==
 <StructureSection load='1hbh' size='340' side='right' caption='[[1hbh]], [[Resolution|resolution]] 2.20&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=HEM:PROTOPORPHYRIN+IX+CONTAINING+FE'>HEM</scene></td></tr>
 <tr id='NonStdRes'><td class="sblockLbl"><b>[[Non-Standard_Residue|NonStd Res:]]</b></td><td class="sblockDat"><scene name='pdbligand=ACE:ACETYL+GROUP'>ACE</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=1hbh FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1hbh OCA], [http://pdbe.org/1hbh PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1hbh RCSB], [http://www.ebi.ac.uk/pdbsum/1hbh 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=1hbh FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1hbh OCA], [http://pdbe.org/1hbh PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1hbh RCSB], [http://www.ebi.ac.uk/pdbsum/1hbh PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=1hbh 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/hb/1hbh_consurf.spt"</scriptWhenChecked>
+    <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/hb/1hbh_consurf.spt"</scriptWhenChecked>
     <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
     <text>to colour the structure by Evolutionary Conservation</text>

1hbh

From Proteopedia

Revision as of 08:52, 10 January 2018

STRUCTURE OF DEOXYHAEMOGLOBIN OF THE ANTARCTIC FISH PAGOTHENIA BERNACCHII AND STRUCTURAL BASIS OF THE ROOT EFFECT

Structural highlights

Function

Evolutionary Conservation

Publication Abstract from PubMed

See Also

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

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