Abstract
Antifreeze protein (AFP) can lower the freezing point by inhibiting the growth of ice crystals. In this article, the thermal hysteresis activity (THA) of a plant AFP was measured with differential scanning calorimetry (DSC). As is shown, when the amount of ice in the sample was less than 5% THA of this AFP reached as high as 0.35°C. The secondary structure of this AFP was studied with circular dichroism (CD). The CD spectrum from 195to 240 nm indicated a well-defined secondary structure consisting 11% α-helix, 34%antiparallel β-sheet and 55% random coil.
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C. L. Hew and D. S. C. Yang, Eur. J. Biochem., 203 (1992) 33.
J. G. Duman, Biochimica et Biophysica Acta, 1206 (1994) 129.
W. C. How, M. Griffith, P. Chong and D. S. C. Yang, Plant Physiol, 104 (1994) 971.
T. N. Hansen and J. G. Baust, Biochim. Biophys. Acta, 957 (1988) 217.
J. G. Duman and T. M. Olsen, Cryobiology, 30 (1993) 322.
V. S. Ananthanarayanan, D. Slaughter and C. L. Hew, Biochim. Biophys. Acta, 870 (1986) 154.
D. Slaughter, G. L. Fletcher, V. S. Ananthanaryanan and C. L. Hew, J. Bio. Chem., 256 (1981) 2022.
F. D. Sonnichsen, B. D. Sykes, H. Chao and P. L. Davies, Science, 259 (1993) 1154.
P. L. Davies and C. L. Hew, FASEB J., 4 (1992) 2460.
A. L. Devries and Y. Lin, Biochim. Biophys. Acta, 495 (1977) 388.
D. Wen and R. A. Lausen, Biophys. J., 63 (1992) 1659.
J. G. Duman, J. Comp. Physiol. B, 131 (1979) 347.
J. G. Duman, J. Exp. Zool., 201 (1997) 333.
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Lu, M., Wang, B., Li, Z. et al. Differential Scanning Calorimetric and Circular Dichroistic Studies on Plant Antifreeze Proteins. Journal of Thermal Analysis and Calorimetry 67, 689–698 (2002). https://doi.org/10.1023/A:1014369208229
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DOI: https://doi.org/10.1023/A:1014369208229