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Determining the Ice-binding Planes of Antifreeze Proteins by Fluorescence-based Ice Plane Affinity
Published on: January 15, 2014
Antifreeze glycopeptide adsorption on single crystal ice surfaces using ellipsometry
P W Wilson1, D Beaglehole, A L Devries
1Physics Department, Victoria University of Wellington, Wellington, New Zealand.
Biophysical Journal
|May 12, 2009
Summary
Antarctic fish use antifreeze proteins to prevent ice crystal growth by adsorbing to ice surfaces. This study quantified antifreeze glycopeptide adsorption on ice crystals using ellipsometry.
Area of Science:
- Biochemistry
- Materials Science
- Cryobiology
Background:
- Antarctic fish possess antifreeze proteins (AFPs) crucial for survival in sub-zero environments.
- AFPs inhibit ice crystal growth by adsorbing to the ice surface, preventing thermal hysteresis.
Purpose of the Study:
- To quantify the adsorption of glycopeptide antifreeze proteins to different ice crystal faces.
- To determine the kinetics and saturation coverage of AFP adsorption.
Main Methods:
- Ellipsometry was employed to measure the adsorption of glycopeptide AFPs onto single ice crystals.
- Adsorption was studied on both basal and prism faces of ice.
- Measurements were conducted over a range of protein concentrations (0.0005–1.2 mg/ml) and time.
Main Results:
- The rate of AFP accumulation on ice surfaces was determined as a function of time and concentration.
- Packing density of AFPs at saturation coverage was estimated for both basal and prism ice faces.
- Differential adsorption behavior was observed between basal and prism faces.
Conclusions:
- Glycopeptide AFPs adsorb to ice surfaces, with adsorption kinetics and density dependent on the ice face.
- Ellipsometry provides a quantitative method to study AFP-ice interactions.
- Understanding AFP adsorption mechanisms is key to their application in cryoprotection.
