Antifreeze Glycoprotein Activity Correlates with Long-Range Protein-Water Dynamics
Antifreeze Glycoprotein Activity Correlates with Long-Range Protein-Water Dynamics
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DOI：
10.1021/ja1051632
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发表时间：
2010-09-08
影响因子：
15
通讯作者：
Havenith, Martina
中科院分区：
文献类型：
--
作者：
Ebbinghaus, Simon;Meister, Konrad;Havenith, Martina
Antifreeze proteins (AFPs) and antifreeze glycoproteins (AFGPs) enable the survival of organisms living in subfreezing habitats and serve as preservatives. Although their function is known, the underlying molecular mechanism was not understood. Mutagenesis experiments questioned the previous assumption of hydrogen bonding as the dominant mechanism. We use terahertz spectroscopy to show that antifreeze activity is directly correlated with long-range collective hydration dynamics. Our results provide evidence for a new model of how AFGPs prevent water from freezing. We suggest that antifreeze activity may be induced because the AFGP perturbs the aqueous solvent over long distances. Retarded water dynamics in the large hydration shell does not favor freezing. The complexation of the carbohydrate cis-hydroxyl groups by borate suppresses the long-range hydration shell detected by terahertz absorption. The hydration dynamics shift toward bulk water behavior strongly reduces the AFGP antifreeze activity, further supporting our model.
