1SPG

CARBONMONOXY HEMOGLOBIN FROM THE TELEOST FISH LEIOSTOMUS XANTHURUS


Experimental Data Snapshot

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

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

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 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 crys ...

    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.


    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


    Organizational Affiliation

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




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
HEMOGLOBIN
A
144Leiostomus xanthurusMutation(s): 0 
Gene Names: hba
Find proteins for P56250 (Leiostomus xanthurus)
Go to UniProtKB:  P56250
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
HEMOGLOBIN
B
147Leiostomus xanthurusMutation(s): 0 
Gene Names: hbb
Find proteins for P56251 (Leiostomus xanthurus)
Go to UniProtKB:  P56251
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
HEM
Query on HEM

Download SDF File 
Download CCD File 
A, B
PROTOPORPHYRIN IX CONTAINING FE
HEME
C34 H32 Fe N4 O4
KABFMIBPWCXCRK-RGGAHWMASA-L
 Ligand Interaction
CMO
Query on CMO

Download SDF File 
Download CCD File 
A, B
CARBON MONOXIDE
C O
UGFAIRIUMAVXCW-UHFFFAOYSA-N
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
ACE
Query on ACE
A
NON-POLYMERC2 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 = 89.600α = 90.00
b = 75.600β = 141.90
c = 69.700γ = 90.00
Software Package:
Software NamePurpose
X-PLORrefinement
XENGENdata reduction
XENGENdata scaling
X-PLORmodel building
X-PLORphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

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