1G0A

CARBONMONOXY LIGANDED BOVINE HEMOGLOBIN PH 8.5


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.04 Å
  • R-Value Work: 0.189 
  • R-Value Observed: 0.189 

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This is version 1.2 of the entry. See complete history


Literature

Interface sliding as illustrated by the multiple quaternary structures of liganded hemoglobin.

Mueser, T.C.Rogers, P.H.Arnone, A.

(2000) Biochemistry 39: 15353-15364

  • DOI: 10.1021/bi0012944
  • Primary Citation of Related Structures:  
    1G09, 1G08, 1G0A, 1G0B

  • PubMed Abstract: 
  • Initial crystallographic studies suggested that fully liganded mammalian hemoglobin can adopt only a single quaternary structure, the quaternary R structure. However, more recent crystallographic studies revealed the existence of a second quaternary structure for liganded hemoglobin, the quaternary R2 structure ...

    Initial crystallographic studies suggested that fully liganded mammalian hemoglobin can adopt only a single quaternary structure, the quaternary R structure. However, more recent crystallographic studies revealed the existence of a second quaternary structure for liganded hemoglobin, the quaternary R2 structure. Since these quaternary structures can be crystallized, both must be energetically accessible structures that coexist in solution. Unanswered questions include (i) the relative abundance of the R and R2 structures under various solution conditions and (ii) whether other quaternary structures are energetically accessible for the liganded alpha(2)beta(2) hemoglobin tetramer. Although crystallographic methods cannot directly answer the first question, they represent the most direct and most accurate approach to answering the second question. We now have determined and refined three different crystal structures of bovine carbonmonoxyhemoglobin. These structures provide clear evidence that the dimer-dimer interface of liganded hemoglobin has a wide range of energetically accessible structures that are related to each other by a simple sliding motion. The dimer-dimer interface acts as a "molecular slide bearing" that allows the two alpha beta dimers to slide back and forth without greatly altering the number or the nature of the intersubunit contacts. Since the general stereochemical features of this interface are not unusual, it is likely that interface sliding of the kind displayed by fully liganded hemoglobin plays important structural and functional roles in many other protein assemblies.


    Organizational Affiliation

    Department of Biochemistry, College of Medicine, The University of Iowa, Iowa City, Iowa 52242, USA.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
HEMOGLOBIN ALPHA CHAINA, C141Bos taurusMutation(s): 0 
Gene Names: HBA
UniProt
Find proteins for P01966 (Bos taurus)
Explore P01966 
Go to UniProtKB:  P01966
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
HEMOGLOBIN BETA CHAINB, D145Bos taurusMutation(s): 0 
Gene Names: HBB
UniProt
Find proteins for P02070 (Bos taurus)
Explore P02070 
Go to UniProtKB:  P02070
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.04 Å
  • R-Value Work: 0.189 
  • R-Value Observed: 0.189 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 73.8α = 90
b = 131.4β = 90
c = 63.1γ = 90
Software Package:
Software NamePurpose
MERLOTphasing
PROLSQrefinement
SDMSdata reduction
SDMSdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2000-12-27
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance