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.

Macromolecule Content

• Total Structure Weight: 32403.53 
• Atom Count: 2289 
• Residue Count: 287 
• Unique protein chains: 2

2MHB

THE STRUCTURE OF HORSE METHAEMOGLOBIN AT 2.0 ANGSTROMS RESOLUTION

• DOI: 10.2210/pdb2MHB/pdb
• Entry 2MHB supersedes 1MHB

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


• Deposited: 1977-02-14 Released: 1983-01-20 
• Deposition Author(s): Ladner, R.C., Heidner, E.G., Perutz, M.F.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2 Å
• R-Value Work: 0.230 

Literature

The structure of horse methaemoglobin at 2-0 A resolution.

Ladner, R.C., Heidner, E.J., Perutz, M.F.

(1977) J.Mol.Biol. 114: 385-414

• PubMed: 561852 
• Also Cited By: 1G0B

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
HEMOGLOBIN (AQUO MET) (ALPHA CHAIN)	A	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 (AQUO MET) (BETA CHAIN)	B	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	PROTOPORPHYRIN IX CONTAINING FE HEME C34 H32 Fe N4 O4 KABFMIBPWCXCRK-RGGAHWMASA-L

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2 Å
• R-Value Work: 0.230 
• Space Group: C 1 2 1

Unit Cell:

Length (Å)	Angle (°)
a = 108.240	α = 90.00
b = 63.130	β = 110.85
c = 54.540	γ = 90.00

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 1977-02-14 
• Released Date: 1983-01-20 
• Deposition Author(s): Ladner, R.C., Heidner, E.G., Perutz, M.F.
• This entry supersedes: 1MHB

Revision History 

• Version 1.0: 1983-01-20
  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: 2012-11-28
  Type: Other