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Science 21 October 2005:
Vol. 310. no. 5747, p. 461
DOI: 10.1126/science.1115145
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Brevia

Glycine-Rich Antifreeze Proteins from Snow Fleas

Laurie A. Graham1 and Peter L. Davies1,2*

We purified antifreeze proteins from winter-active snow fleas, Hypogastrura harveyi. These 6.5- and 15.7-kilodalton thermolabile proteins are glycine-rich (45% of the residues), and the short isoform is composed of the tripeptide repeat Gly-X-X. This makes them very different from other antifreeze proteins, including two from insects, suggesting independent adaptation to freezing environments.

1 Department of Biochemistry.
2 Protein Function Discovery Group, Queen's University, Kingston, ON K7L 3N6, Canada.

* To whom correspondence should be addressed. E-mail: daviesp{at}post.queensu.ca

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Science. ISSN 0036-8075 (print), 1095-9203 (online)