Antifreeze
proteins are found in some
fish,
insects and
plants. They bind to
ice crystals and prevent them from growing to a
size where they would
damage the
host.
Specific
hydrogen bonds form on the
surface where protein meets ice and inhibits crystal growth. Also noted, the antifreeze molecules accumulate at the interface between ice and water, not at the interface between ice and a vacuum. So an hypothesis is that a hydrophobic reaction between the protein and the neighboring water prevents the water from forming ice crystals.