Primary Citation of Related Structures: 1C89, 1C8A
PubMed Abstract:
The structure of a new antifreeze protein (AFP) variant, RD3, from antarctic eel pout (Rhigophila dearborni) with enhanced activity has been determined for the first time by nuclear magnetic resonance spectroscopy. RD3 comprises a unique translational topology of two homologous type III AFP globular domains, each containing one flat, ice binding plane ...
The structure of a new antifreeze protein (AFP) variant, RD3, from antarctic eel pout (Rhigophila dearborni) with enhanced activity has been determined for the first time by nuclear magnetic resonance spectroscopy. RD3 comprises a unique translational topology of two homologous type III AFP globular domains, each containing one flat, ice binding plane. The ice binding plane of the N domain is located approximately 3.5 A "behind" that of the C domain. The two ice binding planes are located laterally with an angle of 32 +/- 12 degrees between the planes. These results suggest that the C domain plane of RD3 binds first to the ice [1010] prism plane in the <0001> direction, which induces successive ice binding of the N domain in the <0101> direction. This manner of ice binding caused by the unique structural topology of RD3 is thought to be crucial for the significant enhancement of antifreeze activity, especially at low AFP concentrations.
Related Citations:
Determination of the Solution Structure of the N-Domain Plus Linker of Antarctic Eel Pout Antifreeze Protein Rd3 Miura, K., Ohgiya, S., Hoshino, T., Nemoto, N., Odaira, M., Nitta, K., Tsuda, S. (1999) J Biochem 126: 387
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 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
Organizational Affiliation:
Bioscience and Chemistry Division, Hokkaido National Industrial Research Institute, 2-17-2-1 Tsukisamu-Higashi, Toyohira, Sapporo 062-8517, Japan.
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