6FQF

THE X-RAY STRUCTURE OF FERRIC-BETA4 HUMAN HEMOGLOBIN


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.1 Å
  • R-Value Free: 0.265 
  • R-Value Work: 0.204 

wwPDB Validation 3D Report Full Report


This is version 1.0 of the entry. See complete history

Literature

Crystal structure of the ferric homotetrameric beta4human hemoglobin.

Mazzarella, L.Merlino, A.Balasco, N.Balsamo, A.Vergara, A.

(2018) Biophys. Chem. 240: 9-14

  • DOI: 10.1016/j.bpc.2018.05.003

  • PubMed Abstract: 
  • Spectroscopic studies carried out in the early seventies have shown that the β-homotetramer of human hemoglobin (β <sub>4 </sub>-HbA) in the ferric state is a mixture of aquomet and bis-histidyl forms. Here we present the first crystal structure, sol ...

    Spectroscopic studies carried out in the early seventies have shown that the β-homotetramer of human hemoglobin (β 4 -HbA) in the ferric state is a mixture of aquomet and bis-histidyl forms. Here we present the first crystal structure, solved at 2.10 Å resolution, of the oxidized form of β 4 -HbA. The overall quaternary structure of the protein in the ferric state is virtually indistinguishable from that of the ferrous deoxygenated and carbomonoxy forms. The structure reveals that the four hemes are exclusively in an aquomet coordination, without any trace of bis-histidyl coordination. The oxidation of β 4 -HbA is associated with the formation of a disulfide bridge between residues Cys112(G14) of β 1 4 and β 2 3 chains. The coordination state of β 4 -HbA has been compared to that known for other organisms that exhibit bis-histidyl heme coordination in the β 4 state. This occurrence has been discussed in terms of different organism physiology.


    Organizational Affiliation

    Institute of Biostructures and Bioimaging, C.N.R., Naples, Italy.,Department of Chemical Sciences, University of Naples "Federico II", Naples, Italy.,Department of Chemical Sciences, University of Naples "Federico II", Naples, Italy; CEINGE, Napoli, Italy. Electronic address: avergara@unina.it.,Department of Chemical Sciences, University of Naples "Federico II", Naples, Italy; Accademia di Scienze Fisiche e Matematiche della Società Nazionale di Scienze, Lettere ed Arti in Napoli, Naples, Italy.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Hemoglobin subunit beta
A, B, C, D
146Homo sapiensMutation(s): 0 
Gene Names: HBB
Find proteins for P68871 (Homo sapiens)
Go to Gene View: HBB
Go to UniProtKB:  P68871
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
HEM
Query on HEM

Download SDF File 
Download CCD File 
A, B, C, D
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: 2.1 Å
  • R-Value Free: 0.265 
  • R-Value Work: 0.204 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 52.700α = 90.00
b = 82.100β = 91.30
c = 62.500γ = 90.00
Software Package:
Software NamePurpose
HKL-2000data reduction
REFMACrefinement
AMoREphasing
HKL-2000data scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2018-06-13
    Type: Initial release