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 and generated by PISA,PQS (software)

Macromolecule Content

• Total Structure Weight: 33289.99 
• Atom Count: 2343 
• Residue Count: 291 
• Unique protein chains: 2

1SPG

CARBONMONOXY HEMOGLOBIN FROM THE TELEOST FISH LEIOSTOMUS XANTHURUS

• DOI: 10.2210/pdb1SPG/pdb

• Classification: OXYGEN TRANSPORT
• Organism(s): Leiostomus xanthurus


• Deposited: 1996-02-05 Released: 1997-03-12 
• Deposition Author(s): Mylvaganam, S.E., Getzoff, E.D.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.95 Å
• R-Value Free: 0.245 
• R-Value Work: 0.191 

Literature

Structural basis for the root effect in haemoglobin.

Mylvaganam, S.E., Bonaventura, C., Bonaventura, J., Getzoff, E.D.

(1996) Nat.Struct.Mol.Biol. 3: 275-283

• PubMed: 8605630 


• PubMed Abstract: 
  

The remarkable ability of root effect haemoglobins to pump oxygen against high O2 gradients results from extreme, acid-induced reductions in O2 affinity and cooperativity. The long-sought mechanism for the root effect, revealed by the 2 angstrom crystal structure of the ligand-bound haemoglobin from Leiostomus xanthurus at pH 7.5, unexpectedly involves modulation of the R-state. Key residues strategically assemble positive-charge clusters across the allosteric beta1 beta2-interface in the R-state. At low pH, protonation of the beta N terminus and His 147(HC3)beta within these clusters is postulated to destabilize the R-state and promote the acid-triggered, allosteric R-->T switch with concomitant O2 release. Surprisingly, a set of residues specific to root effect haemoglobins recruit additional residues, conserved among most haemoglobins, to produce the root effect.

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Related Citations: 

• Spot Hemoglobin. Studies on the Root Effect Hemoglobin of a Marine Teleost
  Bonaventura, C.,Sullivan, B.,Bonaventura, J.
  (1976) J.Biol.Chem. 251: 1871




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Organizational Affiliation: 

The Scripps Research Institute, La Jolla, California 92037, USA.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
HEMOGLOBIN	A	144	Leiostomus xanthurus	Mutation(s): 0  Gene Names: hba
Find proteins for P56250 (Leiostomus xanthurus) Go to UniProtKB:  P56250

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details
HEMOGLOBIN	B	147	Leiostomus xanthurus	Mutation(s): 0  Gene Names: hbb
Find proteins for P56251 (Leiostomus xanthurus) Go to UniProtKB:  P56251

Small Molecules

Ligands 2 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
CMO	A, B	CARBON MONOXIDE C O UGFAIRIUMAVXCW-UHFFFAOYSA-N

Modified Residues  1 Unique
ID	Chains	Type	Formula	2D Diagram	Parent
ACE	A	NON-POLYMER	C2 H4 O		--

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.95 Å
• R-Value Free: 0.245 
• R-Value Work: 0.191 
• Space Group: C 1 2 1

Unit Cell:

Length (Å)	Angle (°)
a = 89.600	α = 90.00
b = 75.600	β = 141.90
c = 69.700	γ = 90.00

Software Package:

Software Name	Purpose
X-PLOR	refinement
XENGEN	data reduction
XENGEN	data scaling
X-PLOR	model building
X-PLOR	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 1996-02-05 
• Released Date: 1997-03-12 
• Deposition Author(s): Mylvaganam, S.E., Getzoff, E.D.

Revision History 

• Version 1.0: 1997-03-12
  Type: Initial release
• Version 1.1: 2008-03-24
  Type: Version format compliance
• Version 1.2: 2011-07-13
  Type: Derived calculations, Version format compliance