Biological Assembly 1  

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Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Hetero 4-mer - A2B2 Pseudo Symmetry: Dihedral - D2  (3D View)
Pseudo Stoichiometry: Homo 4-mer -A4 

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 64755.31 
• Atom Count: 4566 
• Residue Count: 574 
• Unique protein chains: 2

1J7S

Crystal Structure of deoxy HbalphaYQ, a mutant of HbA

• DOI: 10.2210/pdb1J7S/pdb

• Classification: OXYGEN STORAGE/TRANSPORT
• Organism(s): Homo sapiens
• Expression System: Escherichia coli
• Mutation(s): 4 


• Deposited: 2001-05-18 Released: 2002-02-27 
• Deposition Author(s): Miele, A.E., Draghi, F., Arcovito, A., Bellelli, A., Brunori, M., Travaglini-Allocatelli, C., Vallone, B.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.2 Å
• R-Value Free: 0.210 
• R-Value Work: 0.160 

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

• PubMed: 11724557 
• Primary Citation of Related Structures:  
  1J7Y, 1J7W


• 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 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.

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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: 1
Molecule	Chains	Sequence Length	Organism	Details
Hemoglobin	A, C	141	Homo sapiens	Mutations: Y29L, M1V, Q58H Gene Names: HBA1, HBA2
Find proteins for P69905 (Homo sapiens) Go to Gene View: HBA1 HBA2 Go to UniProtKB:  P69905

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details
Hemoglobin	B, D	146	Homo sapiens	Mutations: M1V Gene Names: HBB
Find proteins for P68871 (Homo sapiens) Go to Gene View: HBB Go to UniProtKB:  P68871

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram & Interactions
HEM	A, B, C, D	PROTOPORPHYRIN IX CONTAINING FE HEME C34 H32 Fe N4 O4 KABFMIBPWCXCRK-RGGAHWMASA-L

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.2 Å
• R-Value Free: 0.210 
• R-Value Work: 0.160 
• Space Group: P 1 2₁ 1

Unit Cell:

Length (Å)	Angle (°)
a = 63.360	α = 90.00
b = 84.320	β = 99.43
c = 54.000	γ = 90.00

Software Package:

Software Name	Purpose
SCALEPACK	data scaling
DENZO	data reduction
REFMAC	refinement

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2001-05-18 
• Released Date: 2002-02-27 
• Deposition Author(s): Miele, A.E., Draghi, F., Arcovito, A., Bellelli, A., Brunori, M., Travaglini-Allocatelli, C., Vallone, B.

Revision History 

• Version 1.0: 2002-02-27
  Type: Initial release
• Version 1.1: 2008-04-27
  Type: Version format compliance
• Version 1.2: 2011-07-13
  Type: Version format compliance
• Version 1.3: 2017-10-04
  Type: Advisory, Refinement description