1ECA

STRUCTURE OF ERYTHROCRUORIN IN DIFFERENT LIGAND STATES REFINED AT 1.4 ANGSTROMS RESOLUTION

• PDB DOI: https://doi.org/10.2210/pdb1ECA/pdb

• Classification: OXYGEN TRANSPORT
• Organism(s): Chironomus thummi thummi
• Mutation(s): No 


• Deposited: 1979-03-07 Released: 1979-07-05 
• Deposition Author(s): Steigemann, W., Weber, E.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.40 Å

Literature

Structure of erythrocruorin in different ligand states refined at 1.4 A resolution.

Steigemann, W., Weber, E.

(1979) J Mol Biol 127: 309-338

• PubMed: 430568 
• DOI: https://doi.org/10.1016/0022-2836(79)90332-2
• Primary Citation of Related Structures:  
  1ECA, 1ECD, 1ECN, 1ECO

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 15.42 kDa 
• Atom Count: 1,187 
• Modelled Residue Count: 136 
• Deposited Residue Count: 136 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
ERYTHROCRUORIN (AQUO MET)	A	136	Chironomus thummi thummi	Mutation(s): 0
UniProt
Find proteins for P02229 (Chironomus thummi thummi) Explore P02229  Go to UniProtKB:  P02229

Small Molecules

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

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.40 Å
• Space Group: P 3₂

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 54.3	α = 90
b = 54.3	β = 90
c = 35.6	γ = 120

Structure Validation

Entry History 

Deposition Data

• Released Date: 1979-07-05 
Deposition Author(s): Steigemann, W., Weber, E.

Revision History  

• Version 1.0: 1979-07-05
  Type: Initial release
  
• Version 1.1: 2008-03-24
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2024-02-07
  Changes: Data collection, Database references, Derived calculations, Other