Biological Assembly 1  

 3D View: Structure | Ligand Interaction

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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.

Macromolecule Content

• Total Structure Weight: 64611.05 
• Atom Count: 4560 
• Residue Count: 574 
• Unique protein chains: 2

1HGC

HIGH RESOLUTION CRYSTAL STRUCTURES AND COMPARISONS OF T STATE DEOXYHAEMOGLOBIN AND TWO LIGANDED T-STATE HAEMOGLOBINS: T(ALPHA-OXY)HAEMOGLOBIN AND T(MET)HAEMOGLOBIN

• DOI: 10.2210/pdb1HGC/pdb

• Classification: OXYGEN TRANSPORT
• Organism(s): Homo sapiens


• Deposited: 1991-10-31 Released: 1994-01-31 
• Deposition Author(s): Liddington, R., Derewenda, Z., Dodson, E., Hubbard, R., Dodson, G.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.1 Å

Literature

High resolution crystal structures and comparisons of T-state deoxyhaemoglobin and two liganded T-state haemoglobins: T(alpha-oxy)haemoglobin and T(met)haemoglobin.

Liddington, R., Derewenda, Z., Dodson, E., Hubbard, R., Dodson, G.

(1992) J.Mol.Biol. 228: 551-579

• PubMed: 1453464 
• Primary Citation of Related Structures:  
  1HGB, 1HGA


• PubMed Abstract: 
  

The origin of co-operativity in haemoglobin (Hb) resides in the reduced affinity of the T-state. T-state Hb crystals grown from polyethyleneglycol can be liganded without the molecule switching to the R high affinity state. X-ray analysis of T-state alpha-oxy Hb and T-state met Hb has identified the structural basis for reduced affinity. The nature of the chemical tension at the haem environment is different in the alpha and beta haems. There are small but definite structural changes associated with ligation in the T-state: these prove to be mostly in the same direction as the larger changes that occur in the T-->R transition.

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Organizational Affiliation: 

Department of Chemistry, University of York, Heslington.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
HEMOGLOBIN (OXY) (ALPHA CHAIN)	A, C	141	Homo sapiens	Mutation(s): 0  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 (DEOXY) (BETA CHAIN)	B, D	146	Homo sapiens	Mutation(s): 0  Gene Names: HBB
Find proteins for P68871 (Homo sapiens) Go to Gene View: HBB Go to UniProtKB:  P68871

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram & Interactions
OXY	A, C	OXYGEN MOLECULE O2 MYMOFIZGZYHOMD-UHFFFAOYSA-N
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: 2.1 Å
• Space Group: P 2₁ 2₁ 2

Unit Cell:

Length (Å)	Angle (°)
a = 95.780	α = 90.00
b = 97.780	β = 90.00
c = 65.490	γ = 90.00

Software Package:

Software Name	Purpose
PROLSQ	refinement

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 1991-10-31 
• Released Date: 1994-01-31 
• Deposition Author(s): Liddington, R., Derewenda, Z., Dodson, E., Hubbard, R., Dodson, G.

Revision History 

• Version 1.0: 1994-01-31
  Type: Initial release
• Version 1.1: 2008-03-03
  Type: Version format compliance
• Version 1.2: 2011-07-13
  Type: Version format compliance
• Version 1.3: 2012-10-17
  Type: Advisory
• Version 1.4: 2014-11-19
  Type: Derived calculations