1HGA

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

• PDB DOI: https://doi.org/10.2210/pdb1HGA/pdb

• Classification: OXYGEN TRANSPORT
• Organism(s): Homo sapiens
• Mutation(s): No 


• 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: 2.10 Å
• R-Value Observed: 0.200 

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 
• DOI: https://doi.org/10.1016/0022-2836(92)90842-8
• Primary Citation of Related Structures:  
  1HGA, 1HGB, 1HGC


• 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.

Biological Assembly 1  

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

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 64.55 kDa 
• Atom Count: 4,645 
• Modelled Residue Count: 574 
• Deposited Residue Count: 574 
• Unique protein chains: 2

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
HEMOGLOBIN (DEOXY) (ALPHA CHAIN)	A, C	141	Homo sapiens	Mutation(s): 0
UniProt & NIH Common Fund Data Resources
Find proteins for P69905 (Homo sapiens) Explore P69905  Go to UniProtKB:  P69905
PHAROS:  P69905 GTEx:  ENSG00000188536 ENSG00000206172

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
HEMOGLOBIN (DEOXY) (BETA CHAIN)	B, D	146	Homo sapiens	Mutation(s): 0
UniProt & NIH Common Fund Data Resources
Find proteins for P68871 (Homo sapiens) Explore P68871  Go to UniProtKB:  P68871
PHAROS:  P68871 GTEx:  ENSG00000244734

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
HEM	E [auth A], F [auth B], G [auth C], H [auth D]	PROTOPORPHYRIN IX CONTAINING FE C34 H32 Fe N4 O4 KABFMIBPWCXCRK-RGGAHWMASA-L

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.10 Å
• R-Value Observed: 0.200 
• Space Group: P 2₁ 2₁ 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 95.78	α = 90
b = 97.78	β = 90
c = 65.49	γ = 90

Software Package:

Software Name	Purpose
PROLSQ	refinement

Structure Validation

Entry History 

Deposition Data

• 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
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2012-10-17
  Changes: Advisory
• Version 1.4: 2014-11-19
  Changes: Derived calculations
• Version 2.0: 2023-02-08
  Type: Remediation
  Changes: Atomic model, Data collection, Database references, Derived calculations, Other
• Version 2.1: 2023-03-15
  Changes: Advisory
• Version 2.2: 2024-05-22
  Changes: Data collection