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Identification of Plant Ice-binding Proteins Through Assessment of Ice-recrystallization Inhibition and Isolation Using Ice-affinity Purification
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Extended Temperature Range of the Ice-Binding Protein Activity.

Vera Sirotinskaya1, Maya Bar Dolev1,2, Victor Yashunsky1,3

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Summary

Antifreeze proteins (AFPs) prevent ice damage in organisms. This study shows AFPs inhibit ice formation and growth even at -80°C, enhancing cryopreservation potential.

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Area of Science:

  • Cryobiology
  • Biochemistry
  • Materials Science

Background:

  • Ice-binding proteins (IBPs) protect organisms from freezing.
  • IBPs inhibit ice growth, recrystallization, nucleation, and shaping.
  • Limited data exists on IBPs' functionality under cryogenic conditions.

Purpose of the Study:

  • Investigate the impact of fish type III AFP and Tenebrio molitor AFP on vitrified solutions.
  • Assess AFP efficacy in depressing devitrification and ice recrystallization at cryogenic temperatures.

Main Methods:

  • Tested fish type III AFP and Tenebrio molitor AFP in vitrified dimethylsulfoxide (DMSO) solutions.
  • Observed AFP effects on ice formation and recrystallization at -80 °C.

Main Results:

  • Both AFPs successfully depressed devitrification at -80 °C.
  • AFPs inhibited ice recrystallization during warming phases.
  • Demonstrated AFP activity below the homogeneous nucleation temperature regime.

Conclusions:

  • AFPs are active and effective at cryogenic temperatures (-80 °C).
  • AFPs show potential for enhancing cryopreservation by minimizing ice-related damage.
  • Further research into AFPs can advance cryopreservation techniques.