Designing and studying a mutant form of the ice-binding protein from Choristoneura fumiferana.
Glukhova, K. A.; Okulova, J. D.; Melnik, B. S.
Show abstract
Ice-binding proteins are expressed in the cells of some organisms, helping them to survive extremely low temperatures. One of the problems in study of such proteins is the difficulty of isolation and purification. For example, eight cysteine residues in cfAFP from Choristoneura fumiferana (the eastern spruce budworm) form intermolecular bridges during the overexpression of this protein. This impedes the process of the protein purification dramatically. In this work we designed a mutant form of ice-binding protein cfAFP, which is much more easy to isolate that the wild-type protein. The mutant form named mIBP83 did not lose the ability to bind to ice surface. Besides, observation of the processes of freezing and melting of ice in presence of mIBP83 showed that this protein affects the process of ice melting, increasing its melting temperature, and at least does not decrease the freezing temperature.
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