1A9W

HUMAN EMBRYONIC GOWER II CARBONMONOXY HEMOGLOBIN


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.90 Å
  • R-Value Free: 0.232 
  • R-Value Work: 0.185 
  • R-Value Observed: 0.185 

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This is version 1.2 of the entry. See complete history


Literature

Crystal structure of a human embryonic haemoglobin: the carbonmonoxy form of gower II (alpha2 epsilon2) haemoglobin at 2.9 A resolution.

Sutherland-Smith, A.J.Baker, H.M.Hofmann, O.M.Brittain, T.Baker, E.N.

(1998) J Mol Biol 280: 475-484

  • DOI: 10.1006/jmbi.1998.1868
  • Primary Citation of Related Structures:  
    1A9W

  • PubMed Abstract: 
  • The production of recombinant embryonic haemoglobins via a yeast expression system has enabled structural and functional studies to be conducted on these proteins. As part of a programme aimed at understanding the properties of the embryonic haemoglobins we have crystallized the human alpha2 epsilon2 (Gower II) embryonic haemoglobin in its carbonmonoxy form, and determined its structure by X-ray crystallography ...

    The production of recombinant embryonic haemoglobins via a yeast expression system has enabled structural and functional studies to be conducted on these proteins. As part of a programme aimed at understanding the properties of the embryonic haemoglobins we have crystallized the human alpha2 epsilon2 (Gower II) embryonic haemoglobin in its carbonmonoxy form, and determined its structure by X-ray crystallography. The structure was solved by molecular replacement and refined at 2.9 A to give a final model with R-factor=0.185 and Rfree=0.235. The Gower II hemoglobin tetramer is intermediate between the adult R and R2 states, though closer to R2. The tertiary structure of the conserved alpha subunit is essentially identical when compared to that found in the adult (alpha2 beta2) and fetal (alpha2 gamma2) hemoglobins. The embryonic epsilon subunit has a structure very similar to that of the homologous adult beta and fetal gamma subunits, although with small differences at the N terminus and in the A helix. Amino acid substitutions can be identified that may play a role in the altered response of the Gower II haemoglobin to allosteric effectors, in particular chloride ions. The reduced chloride effect is thought to be the primary cause of the higher affinity of this embryonic hemoglobin in comparison to the adult molecule.


    Organizational Affiliation

    Department of Biochemistry, Massey University, Palmerston North, New Zealand.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
HEMOGLOBIN (ALPHA CHAIN)A, C141Homo sapiensMutation(s): 0 
Gene Names: HBA1HBA2
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Find proteins for P69905 (Homo sapiens)
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Go to UniProtKB:  P69905
PHAROS:  P69905
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
HEMOGLOBIN (BETA CHAIN)B [auth E], D [auth F]146Homo sapiensMutation(s): 0 
Gene Names: HBE1HBE
UniProt & NIH Common Fund Data Resources
Find proteins for P02100 (Homo sapiens)
Explore P02100 
Go to UniProtKB:  P02100
PHAROS:  P02100
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.90 Å
  • R-Value Free: 0.232 
  • R-Value Work: 0.185 
  • R-Value Observed: 0.185 
  • Space Group: P 43 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 62.8α = 90
b = 62.8β = 90
c = 320.9γ = 90
Software Package:
Software NamePurpose
AMoREphasing
TFFCmodel building
X-PLORrefinement
DENZOdata reduction
CCP4data scaling
ROTAVATA)data scaling
TFFCphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1998-06-17
    Type: Initial release
  • Version 1.1: 2008-03-24
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance