Biological Assembly 1  

 3D View: Structure | Electron Density | 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: 64807.05 
• Atom Count: 4578 
• Residue Count: 574 
• Unique protein chains: 2

1Y8K

Horse methemoglobin low salt, PH 7.0 (88% relative humidity)

• DOI: 10.2210/pdb1Y8K/pdb

• Classification: OXYGEN STORAGE/TRANSPORT
• Organism(s): Equus caballus


• Deposited: 2004-12-13 Released: 2005-07-26 
• Deposition Author(s): Sankaranarayanan, R., Biswal, B.K., Vijayan, M.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.3 Å
• R-Value Free: 0.228 
• R-Value Work: 0.183 

Literature

A new relaxed state in horse methemoglobin characterized by crystallographic studies.

Sankaranarayanan, R., Biswal, B.K., Vijayan, M.

(2005) Proteins 60: 547-551

• PubMed: 15887226 
• DOI: 10.1002/prot.20510
• Primary Citation of Related Structures:  
  1Y8I, 1Y8H
• Also Cited By: 2ZLX, 2ZLW, 2ZLV, 2ZLU, 2ZLT


• PubMed Abstract: 
  

A new relaxed state has been characterized in the crystals of horse methemoglobin grown at neutral pH at low ionic concentration and their low humidity variants. The crystals provide an example for improvement in X-ray diffraction quality with reduced solvent content. Only the classical R state has been so far observed in liganded horse hemoglobin. The state characterized in the present study lies in between the R state and the R2 state characterized earlier in liganded human hemoglobin. The results presented here, along with those of earlier studies, suggest that relaxed and tense hemoglobin can access ensembles of states.

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Related Citations: 

• Structure of Human Methaemoglobin: The Variation of a Theme
  Biswal, B.K.,Vijayan, M.
  (2001) Curr.Sci. 81: 1100
• Structures of Human Oxy- and Deoxyhaemoglobin at Different Levels of Humidity: Variability in the T State
  Biswal, B.K.,Vijayan, M.
  (2002) Acta Crystallogr.,Sect.D 58: 1155




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Organizational Affiliation: 

Molecular Biophysics Unit, Indian Institute of Science, Bangalore, India.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
Hemoglobin alpha chains	A, C	141	Equus caballus	Mutation(s): 0  Gene Names: HBA
Find proteins for P01958 (Equus caballus) Go to UniProtKB:  P01958

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details
Hemoglobin beta chain	B, D	146	Equus caballus	Mutation(s): 0  Gene Names: HBB
Find proteins for P02062 (Equus caballus) Go to Gene View: HBB Go to UniProtKB:  P02062

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: 2.3 Å
• R-Value Free: 0.228 
• R-Value Work: 0.183 
• Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length (Å)	Angle (°)
a = 62.519	α = 90.00
b = 80.140	β = 90.00
c = 111.315	γ = 90.00

Software Package:

Software Name	Purpose
SCALEPACK	data scaling
CNS	refinement
DENZO	data reduction
AMoRE	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2004-12-13 
• Released Date: 2005-07-26 
• Deposition Author(s): Sankaranarayanan, R., Biswal, B.K., Vijayan, M.

Revision History 

• Version 1.0: 2005-07-26
  Type: Initial release
• Version 1.1: 2008-04-30
  Type: Version format compliance
• Version 1.2: 2011-07-13
  Type: Version format compliance