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Related Experiment Video

Updated: Jan 4, 2026

Determining the Ice-binding Planes of Antifreeze Proteins by Fluorescence-based Ice Plane Affinity

Determining the Ice-binding Planes of Antifreeze Proteins by Fluorescence-based Ice Plane Affinity

Published on: January 15, 2014

Synergy between Antifreeze Proteins Is Driven by Complementary Ice-Binding.

Tehilla Berger¹, Konrad Meister², Arthur L DeVries³

¹Department of Chemistry and Biochemistry , Yeshiva University , New York , New York 10016 , United States.

Journal of the American Chemical Society

|November 12, 2019

Summary

Antifreeze proteins (AFPs) can work together synergistically to inhibit ice growth. This study reveals that synergy occurs when different AFP types bind to distinct ice crystal planes, explaining their distribution in cold-adapted organisms.

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Determining the Ice-binding Planes of Antifreeze Proteins by Fluorescence-based Ice Plane Affinity

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LabVIEW-operated Novel Nanoliter Osmometer for Ice Binding Protein Investigations

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Area of Science:

Biophysics
Cryobiology
Molecular Biology

Background:

Cold-adapted organisms possess multiple antifreeze (glyco)protein (AFGP) isoforms with varying ice-inhibiting activities.
Mixtures of AFPs can exhibit synergistic enhancement, but the underlying mechanism remains unclear.

Purpose of the Study:

To elucidate the mechanism of synergistic ice growth inhibition by mixtures of AF(G)Ps.
To correlate AFP binding behavior with synergistic or antagonistic effects.

Main Methods:

Utilized cold-stage microscopy, microfluidics, and fluorescence microscopy to study binary mixtures of AF(G)Ps.
Measured ice growth inhibition activity of AF(G)P mixtures from diverse species.
Visualized AFP binding to ice crystal planes using differentially labeled isoforms.

Main Results:

Several AF(G)P mixtures showed synergistic ice growth inhibition, while others exhibited antagonism due to competition for binding sites.
Synergistic mixtures involved AF(G)Ps binding to different ice crystal planes.
A kinetic model was developed, indicating active isoforms bind rapidly to prism planes, promoting passive isoform binding to pyramidal planes.

Conclusions:

The study provides a kinetic mechanism for AF(G)P synergy, explaining how active and passive isoforms cooperate for enhanced ice inhibition.
Findings help explain the biological distribution of AF(G)P isoforms in fish.
This research clarifies the physical chemistry behind synergistic ice crystal growth inhibition by multiple inhibitors.