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New insights into ice growth and melting modifications by antifreeze proteins
Stockholm University, Nordic Institute for Theoretical Physics (Nordita).
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2012 (English)In: Journal of the Royal Society Interface, ISSN 1742-5662, E-ISSN 1742-5689, Vol. 9, no 77, 3249-3259 p.Article in journal (Refereed) Published
Abstract [en]

Antifreeze proteins (AFPs) evolved in many organisms, allowing them to survive in cold climates by controlling ice crystal growth. The specific interactions of AFPs with ice determine their potential applications in agriculture, food preservation and medicine. AFPs control the shapes of ice crystals in a manner characteristic of the particular AFP type. Moderately active AFPs cause the formation of elongated bipyramidal crystals, often with seemingly defined facets, while hyperactive AFPs produce more varied crystal shapes. These different morphologies are generally considered to be growth shapes. In a series of bright light and fluorescent microscopy observations of ice crystals in solutions containing different AFPs, we show that crystal shaping also occurs during melting. In particular, the characteristic ice shapes observed in solutions of most hyperactive AFPs are formed during melting. We relate these findings to the affinities of the hyperactive AFPs for the basal plane of ice. Our results demonstrate the relation between basal plane affinity and hyperactivity and show a clear difference in the ice-shaping mechanisms of most moderate and hyperactive AFPs. This study provides key aspects associated with the identification of hyperactive AFPs.

Place, publisher, year, edition, pages
2012. Vol. 9, no 77, 3249-3259 p.
Keyword [en]
ice-binding proteins, melting shapes, ice-structuring proteins, crystal growth, antifreeze proteins, hyperactive antifreeze proteins
National Category
Natural Sciences
URN: urn:nbn:se:su:diva-83813DOI: 10.1098/rsif.2012.0388ISI: 000310573100008OAI: diva2:577123


Available from: 2012-12-14 Created: 2012-12-14 Last updated: 2012-12-14Bibliographically approved

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Wettlaufer, John S.
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Nordic Institute for Theoretical Physics (Nordita)
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