3PEL

Structure of Greyhound Hemoglobin: Origin of High Oxygen Affinity


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å
  • R-Value Free: 0.232 
  • R-Value Work: 0.188 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Structure of Greyhound hemoglobin: origin of high oxygen affinity.

Bhatt, V.S.Zaldivar-Lopez, S.Harris, D.R.Couto, C.G.Wang, P.G.Palmer, A.F.

(2011) Acta Crystallogr.,Sect.D 67: 395-402

  • DOI: 10.1107/S0907444911006044

  • PubMed Abstract: 
  • This study presents the crystal structure of Greyhound hemoglobin (GrHb) determined to 1.9 Å resolution. GrHb was found to crystallize with an α₁β₁ dimer in the asymmetric unit and belongs to the R2 state. Oxygen-affinity measurements combined with t ...

    This study presents the crystal structure of Greyhound hemoglobin (GrHb) determined to 1.9 Å resolution. GrHb was found to crystallize with an α₁β₁ dimer in the asymmetric unit and belongs to the R2 state. Oxygen-affinity measurements combined with the fact that GrHb crystallizes in the R2 state despite the high-salt conditions used for crystallization strongly indicate that GrHb can serve as a model high-oxygen-affinity hemoglobin (Hb) for higher mammals, especially humans. Structural analysis of GrHb and its comparison with the R2-state of human Hb revealed several regions that can potentially contribute to the high oxygen affinity of GrHb and serve to rationalize the additional stability of the R2-state of GrHb. A previously well studied hydrophobic cluster of bar-headed goose Hb near α119 was also incorporated in the comparison between GrHb and human Hb. Finally, a structural comparison with generic dog Hb and maned wolf Hb was conducted, revealing that in contrast to GrHb these structures belong to the R state of Hb and raising the intriguing possibility of an additional allosteric factor co-purifying with GrHb that can modulate its quaternary structure.


    Organizational Affiliation

    Biophysics Graduate Program, The Ohio State University, Columbus, OH 43210, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Hemoglobin subunit alpha
A
141Canis lupus familiarisMutation(s): 0 
Gene Names: HBA
Find proteins for P60529 (Canis lupus familiaris)
Go to UniProtKB:  P60529
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Hemoglobin subunit beta
B
146Canis lupus familiarisMutation(s): 0 
Gene Names: HBB
Find proteins for P60524 (Canis lupus familiaris)
Go to Gene View: HBB
Go to UniProtKB:  P60524
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
HEM
Query on HEM

Download SDF File 
Download CCD File 
A, B
PROTOPORPHYRIN IX CONTAINING FE
HEME
C34 H32 Fe N4 O4
KABFMIBPWCXCRK-RGGAHWMASA-L
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å
  • R-Value Free: 0.232 
  • R-Value Work: 0.188 
  • Space Group: C 1 2 1
Unit Cell:
Length (Å)Angle (°)
a = 87.973α = 90.00
b = 88.045β = 103.37
c = 53.073γ = 90.00
Software Package:
Software NamePurpose
CrystalCleardata reduction
AMoREphasing
REFMACrefinement
CrystalCleardata scaling
CrystalCleardata collection

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2010-11-03
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance