1J7Y

Crystal structure of partially ligated mutant of HbA


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.70 Å
  • R-Value Free: 0.201 
  • R-Value Work: 0.155 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Control of heme reactivity by diffusion: structural basis and functional characterization in hemoglobin mutants.

Miele, A.E.Draghi, F.Arcovito, A.Bellelli, A.Brunori, M.Travaglini-Allocatelli, C.Vallone, B.

(2001) Biochemistry 40: 14449-14458

  • DOI: 10.1021/bi011602d
  • Structures With Same Primary Citation

  • PubMed Abstract: 
  • The effect of mutagenesis on O(2), CO, and NO binding to mutants of human hemoglobin, designed to modify some features of the reactivity that hinder use of hemoglobin solutions as blood substitute, has been extensively investigated. The kinetics may ...

    The effect of mutagenesis on O(2), CO, and NO binding to mutants of human hemoglobin, designed to modify some features of the reactivity that hinder use of hemoglobin solutions as blood substitute, has been extensively investigated. The kinetics may be interpreted in the framework of the Monod-Wyman-Changeux two-state allosteric model, based on the high-resolution crystallographic structures of the mutants and taking into account the control of heme reactivity by the distal side mutations. The mutations involve residues at topological position B10 and E7, i.e., Leu (B10) to Tyr and His (E7) to Gln, on either the alpha chains alone (yielding the hybrid tetramer Hbalpha(YQ)), the beta chains alone (hybrid tetramer Hbbeta(YQ)), or both types of chains (Hb(YQ)). Our data indicate that the two mutations affect ligand diffusion into the pocket, leading to proteins with low affinity for O(2) and CO, and especially with reduced reactivity toward NO, a difficult goal to achieve. The observed kinetic heterogeneity between the alpha(YQ) and beta(YQ) chains in Hb(YQ) has been rationalized on the basis of the three-dimensional structure of the active site. Furthermore, we report for the first time an experiment of partial CO binding, selective for the beta chains, to high salt crystals of the mutant Hb(YQ) in the T-state; these crystallographic data may be interpreted as "snapshots" of the initial events possibly occurring on ligand binding to the T-allosteric state of this peculiar mutant Hb.


    Related Citations: 
    • Modulation of Ligand Binding in Engineered Human Hemoglobin Distal Pocket
      Miele, A.E., Santanche, S., Travaglini-Allocatelli, C., Vallone, B., Brunori, M., Bellelli, A.
      (1999) J Mol Biol 290: 515

    Organizational Affiliation

    Department of Biochemical Sciences "A. Rossi Fanelli" and CNR Centre for Molecular Biology, University of Rome "La Sapienza", P.le A. Moro 5, 00185 Rome, Italy.



Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Hemoglobin
B, D
146Homo sapiensMutation(s): 3 
Gene Names: HBB HUMANHBB
Find proteins for P68871 (Homo sapiens)
Go to UniProtKB:  P68871
NIH Common Fund Data Resources
PHAROS  P68871

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Hemoglobin
A, C
141Homo sapiensMutation(s): 3 
Gene Names: HBA HUMANHBA1HBA2
Find proteins for P69905 (Homo sapiens)
Go to UniProtKB:  P69905
NIH Common Fund Data Resources
PHAROS  P69905
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
HEM
Query on HEM

Download CCD File 
A, B, C, D
PROTOPORPHYRIN IX CONTAINING FE
C34 H32 Fe N4 O4
KABFMIBPWCXCRK-RGGAHWMASA-L
 Ligand Interaction
SO4
Query on SO4

Download CCD File 
B
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
CMO
Query on CMO

Download CCD File 
B, D
CARBON MONOXIDE
C O
UGFAIRIUMAVXCW-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.70 Å
  • R-Value Free: 0.201 
  • R-Value Work: 0.155 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 62.57α = 90
b = 82.47β = 99.7
c = 53.69γ = 90
Software Package:
Software NamePurpose
AMoREphasing
REFMACrefinement
DENZOdata reduction
CCP4data scaling

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2002-02-27
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance