1MSI

STRUCTURE OF ANTIFREEZE GLYCOPROTEIN QAE(HPLC 12)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.25 Å
  • R-Value Free: 0.225 
  • R-Value Work: 0.198 
  • R-Value Observed: 0.198 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Structural basis for the binding of a globular antifreeze protein to ice.

Jia, Z.DeLuca, C.I.Chao, H.Davies, P.L.

(1996) Nature 384: 285-288

  • DOI: 10.1038/384285a0
  • Primary Citation of Related Structures:  
    3RDN, 3NLA, 1MSI

  • PubMed Abstract: 
  • Antifreeze proteins (AFPs) have the unique ability to adsorb to ice and inhibit its growth. Many organisms ranging from fish to bacteria use AFPs to retard freezing or lessen the damage incurred upon freezing and thawing. The ice-binding mechanism of ...

    Antifreeze proteins (AFPs) have the unique ability to adsorb to ice and inhibit its growth. Many organisms ranging from fish to bacteria use AFPs to retard freezing or lessen the damage incurred upon freezing and thawing. The ice-binding mechanism of the long linear alpha-helical type I AFPs has been attributed to their regularly spaced polar residues matching the ice lattice along a pyramidal plane. In contrast, it is not known how globular antifreeze proteins such as type III AFP that lack repeating ice-binding residues bind to ice. Here we report the 1.25 A crystal structure of recombinant type III AFP (QAE isoform) from eel pout (Macrozoarces americanus), which reveals a remarkably flat amphipathic ice-binding site where five hydrogen-bonding atoms match two ranks of oxygens on the [1010] ice prism plane in the <0001> direction, giving high ice-binding affinity and specificity. This binding site, substantiated by the structures and properties of several ice-binding site mutants, suggests that the AFP occupies a niche in the ice surface in which it covers the basal plane while binding to the prism face.


    Related Citations: 
    • Erratum. Structural Basis for the Binding of a Globular Antifreeze Protein to Ice
      Jia, Z., Deluca, C.I., Chao, H., Davies, P.L.
      (1997) Nature 385: 555
    • Crystallization and Preliminary X-Ray Crystallographic Studies on Type III Antifreeze Protein
      Jia, Z., Deluca, C.I., Davies, P.L.
      (1995) Protein Sci 4: 1236
    • Use of Proline Mutants to Help Solve the NMR Solution Structure of Type III Antifreeze Protein
      Chao, H., Davies, P.L., Sykes, B.D., Sonnichsen, F.D.
      (1993) Protein Sci 2: 1411
    • Multiple Genes Provide the Basis for Antifreeze Protein Diversity and Dosage in the Ocean Pout, Macrozoarces Americanus
      Hew, C.L., Wang, N.C., Joshi, S., Fletcher, G.L., Scott, G.K., Hayes, P.H., Buettner, B., Davies, P.L.
      (1988) J Biol Chem 263: 12049

    Organizational Affiliation

    Department of Biochemistry, Queen's University, Kingston, Ontario, Canada. jia@crystal.biochem.queensu.ca



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
TYPE III ANTIFREEZE PROTEIN ISOFORM HPLC 12A70Zoarces americanusMutation(s): 1 
Find proteins for P19614 (Zoarces americanus)
Explore P19614 
Go to UniProtKB:  P19614
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.25 Å
  • R-Value Free: 0.225 
  • R-Value Work: 0.198 
  • R-Value Observed: 0.198 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 32.328α = 90
b = 38.893β = 90
c = 45.483γ = 90
Software Package:
Software NamePurpose
X-PLORmodel building
X-PLORrefinement
DENZOdata reduction
SCALEPACKdata scaling
X-PLORphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

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