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
- PubMed: 8918883
- DOI: 10.1038/384285a0
- Primary Citation of Related Structures:  1MSI, 3RDN
- PubMed Abstract:
- Antifreeze Peptide Heterogeneity in an Antarctic Eel Pout Includes an Unusually Large Major Variant Comprised of Two 7 kDa Type III Afps Linked in Tandem
Wang, X.,Devries, A.L.,Cheng, C.H.
(1995) Biochim.Biophys.Acta 1247: 163
- 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
- Refined Solution Structure of Type III Antifreeze Protein: Hydrophobic Groups May be Involved in the Energetics of the Protein-Ice Interaction
Sonnichsen, F.D.,Deluca, C.I.,Davies, P.L.,Sykes, B.D.
(1996) Structure 4: 1325
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  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.
Department of Biochemistry, Queen's University, Kingston, Ontario, Canada. firstname.lastname@example.org