1A9W

HUMAN EMBRYONIC GOWER II CARBONMONOXY HEMOGLOBIN


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.9 Å
  • R-Value Free: 0.232 
  • R-Value Work: 0.185 

wwPDB Validation 3D Report Full Report


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


  • 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 haemoglo ...

    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

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
HEMOGLOBIN (ALPHA CHAIN)
A, C
141Homo sapiensGene Names: HBA1, HBA2
Find proteins for P69905 (Homo sapiens)
Go to Gene View: HBA1 HBA2
Go to UniProtKB:  P69905
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
HEMOGLOBIN (BETA CHAIN)
E, F
146Homo sapiensGene Names: HBE1 (HBE)
Find proteins for P02100 (Homo sapiens)
Go to Gene View: HBE1
Go to UniProtKB:  P02100
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
HEM
Query on HEM

Download SDF File 
Download CCD File 
A, C, E, F
PROTOPORPHYRIN IX CONTAINING FE
HEME
C34 H32 Fe N4 O4
KABFMIBPWCXCRK-RGGAHWMASA-L
 Ligand Interaction
CMO
Query on CMO

Download SDF File 
Download CCD File 
A, C, E, F
CARBON MONOXIDE
C O
UGFAIRIUMAVXCW-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.9 Å
  • R-Value Free: 0.232 
  • R-Value Work: 0.185 
  • Space Group: P 43 21 2
Unit Cell:
Length (Å)Angle (°)
a = 62.800α = 90.00
b = 62.800β = 90.00
c = 320.900γ = 90.00
Software Package:
Software NamePurpose
TFFCmodel building
TFFCphasing
AMoREphasing
X-PLORrefinement
ROTAVATA)data scaling
CCP4data scaling
DENZOdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

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